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From a.@apache.org
Subject [4/6] lucene-solr:branch_7x: SOLR-11285: Support simulations at scale in the autoscaling framework, part 1 (refactoring).
Date Mon, 16 Oct 2017 11:09:18 GMT
http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/java/org/apache/solr/cloud/overseer/ReplicaMutator.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/cloud/overseer/ReplicaMutator.java b/solr/core/src/java/org/apache/solr/cloud/overseer/ReplicaMutator.java
index 82d106d..035de68 100644
--- a/solr/core/src/java/org/apache/solr/cloud/overseer/ReplicaMutator.java
+++ b/solr/core/src/java/org/apache/solr/cloud/overseer/ReplicaMutator.java
@@ -24,9 +24,13 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.NoSuchElementException;
 import java.util.Set;
 
 import org.apache.commons.lang.StringUtils;
+import org.apache.solr.client.solrj.cloud.autoscaling.DistribStateManager;
+import org.apache.solr.client.solrj.cloud.autoscaling.SolrCloudManager;
+import org.apache.solr.client.solrj.cloud.autoscaling.VersionedData;
 import org.apache.solr.cloud.Assign;
 import org.apache.solr.cloud.Overseer;
 import org.apache.solr.cloud.OverseerCollectionMessageHandler;
@@ -38,7 +42,6 @@ import org.apache.solr.common.cloud.Slice;
 import org.apache.solr.common.cloud.ZkNodeProps;
 import org.apache.solr.common.cloud.ZkStateReader;
 import org.apache.solr.common.util.Utils;
-import org.apache.zookeeper.data.Stat;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -50,10 +53,12 @@ import static org.apache.solr.common.params.CommonParams.NAME;
 public class ReplicaMutator {
   private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 
-  protected final ZkStateReader zkStateReader;
+  protected final SolrCloudManager dataProvider;
+  protected final DistribStateManager stateManager;
 
-  public ReplicaMutator(ZkStateReader reader) {
-    this.zkStateReader = reader;
+  public ReplicaMutator(SolrCloudManager dataProvider) {
+    this.dataProvider = dataProvider;
+    this.stateManager = dataProvider.getDistribStateManager();
   }
 
   protected Replica setProperty(Replica replica, String key, String value) {
@@ -196,7 +201,7 @@ public class ReplicaMutator {
   }
 
   public ZkWriteCommand setState(ClusterState clusterState, ZkNodeProps message) {
-    if (Overseer.isLegacy(zkStateReader)) {
+    if (Overseer.isLegacy(dataProvider.getClusterStateProvider())) {
       return updateState(clusterState, message);
     } else {
       return updateStateNew(clusterState, message);
@@ -220,7 +225,7 @@ public class ReplicaMutator {
       ClusterStateMutator.getShardNames(numShards, shardNames);
       Map<String, Object> createMsg = Utils.makeMap(NAME, cName);
       createMsg.putAll(message.getProperties());
-      writeCommand = new ClusterStateMutator(zkStateReader).createCollection(prevState, new ZkNodeProps(createMsg));
+      writeCommand = new ClusterStateMutator(dataProvider).createCollection(prevState, new ZkNodeProps(createMsg));
       DocCollection collection = writeCommand.collection;
       newState = ClusterStateMutator.newState(prevState, cName, collection);
     }
@@ -240,7 +245,7 @@ public class ReplicaMutator {
         log.debug("node=" + coreNodeName + " is already registered");
       } else {
         // if coreNodeName is null, auto assign one
-        coreNodeName = Assign.assignNode(zkStateReader.getZkClient(), collection);
+        coreNodeName = Assign.assignNode(stateManager, collection);
       }
       message.getProperties().put(ZkStateReader.CORE_NODE_NAME_PROP,
           coreNodeName);
@@ -415,14 +420,19 @@ public class ReplicaMutator {
             if (shardParentNode != null && shardParentZkSession != null)  {
               log.info("Checking whether sub-shard leader node is still the same one at {} with ZK session id {}", shardParentNode, shardParentZkSession);
               try {
-                Stat leaderZnodeStat = zkStateReader.getZkClient().exists(ZkStateReader.LIVE_NODES_ZKNODE
-                    + "/" + shardParentNode, null, true);
-                if (leaderZnodeStat == null)  {
+                VersionedData leaderZnode = null;
+                try {
+                  leaderZnode = stateManager.getData(ZkStateReader.LIVE_NODES_ZKNODE
+                      + "/" + shardParentNode, null);
+                } catch (NoSuchElementException e) {
+                  // ignore
+                }
+                if (leaderZnode == null)  {
                   log.error("The shard leader node: {} is not live anymore!", shardParentNode);
                   isLeaderSame = false;
-                } else if (leaderZnodeStat.getEphemeralOwner() != Long.parseLong(shardParentZkSession))  {
+                } else if (!shardParentZkSession.equals(leaderZnode.getOwner())) {
                   log.error("The zk session id for shard leader node: {} has changed from {} to {}",
-                      shardParentNode, shardParentZkSession, leaderZnodeStat.getEphemeralOwner());
+                      shardParentNode, shardParentZkSession, leaderZnode.getOwner());
                   isLeaderSame = false;
                 }
               } catch (Exception e) {
@@ -443,7 +453,7 @@ public class ReplicaMutator {
               }
               propMap.put(ZkStateReader.COLLECTION_PROP, collection.getName());
               ZkNodeProps m = new ZkNodeProps(propMap);
-              return new SliceMutator(zkStateReader).updateShardState(prevState, m).collection;
+              return new SliceMutator(dataProvider).updateShardState(prevState, m).collection;
             } else  {
               // we must mark the shard split as failed by switching sub-shards to recovery_failed state
               Map<String, Object> propMap = new HashMap<>();
@@ -454,7 +464,7 @@ public class ReplicaMutator {
               }
               propMap.put(ZkStateReader.COLLECTION_PROP, collection.getName());
               ZkNodeProps m = new ZkNodeProps(propMap);
-              return new SliceMutator(zkStateReader).updateShardState(prevState, m).collection;
+              return new SliceMutator(dataProvider).updateShardState(prevState, m).collection;
             }
           }
         }

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/java/org/apache/solr/cloud/overseer/SliceMutator.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/cloud/overseer/SliceMutator.java b/solr/core/src/java/org/apache/solr/cloud/overseer/SliceMutator.java
index a611932..6e820b0 100644
--- a/solr/core/src/java/org/apache/solr/cloud/overseer/SliceMutator.java
+++ b/solr/core/src/java/org/apache/solr/cloud/overseer/SliceMutator.java
@@ -26,6 +26,8 @@ import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Set;
 
+import org.apache.solr.client.solrj.cloud.autoscaling.DistribStateManager;
+import org.apache.solr.client.solrj.cloud.autoscaling.SolrCloudManager;
 import org.apache.solr.cloud.Assign;
 import org.apache.solr.cloud.Overseer;
 import org.apache.solr.common.cloud.ClusterState;
@@ -48,11 +50,12 @@ public class SliceMutator {
 
   public static final Set<String> SLICE_UNIQUE_BOOLEAN_PROPERTIES = ImmutableSet.of(PREFERRED_LEADER_PROP);
 
+  protected final SolrCloudManager dataProvider;
+  protected final DistribStateManager stateManager;
 
-  protected final ZkStateReader zkStateReader;
-
-  public SliceMutator(ZkStateReader zkStateReader) {
-    this.zkStateReader = zkStateReader;
+  public SliceMutator(SolrCloudManager dataProvider) {
+    this.dataProvider = dataProvider;
+    this.stateManager = dataProvider.getDistribStateManager();
   }
 
   public ZkWriteCommand addReplica(ClusterState clusterState, ZkNodeProps message) {
@@ -70,7 +73,7 @@ public class SliceMutator {
     if (message.getStr(ZkStateReader.CORE_NODE_NAME_PROP) != null) {
       coreNodeName = message.getStr(ZkStateReader.CORE_NODE_NAME_PROP);
     } else {
-      coreNodeName = Assign.assignNode(zkStateReader.getZkClient(), collection);
+      coreNodeName = Assign.assignNode(stateManager, collection);
     }
     Replica replica = new Replica(coreNodeName,
         makeMap(
@@ -138,9 +141,9 @@ public class SliceMutator {
       String coreURL = ZkCoreNodeProps.getCoreUrl(replica.getStr(ZkStateReader.BASE_URL_PROP), replica.getStr(ZkStateReader.CORE_NAME_PROP));
 
       if (replica == oldLeader && !coreURL.equals(leaderUrl)) {
-        replica = new ReplicaMutator(zkStateReader).unsetLeader(replica);
+        replica = new ReplicaMutator(dataProvider).unsetLeader(replica);
       } else if (coreURL.equals(leaderUrl)) {
-        replica = new ReplicaMutator(zkStateReader).setLeader(replica);
+        replica = new ReplicaMutator(dataProvider).setLeader(replica);
       }
 
       newReplicas.put(replica.getName(), replica);

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/java/org/apache/solr/cloud/overseer/ZkStateWriter.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/cloud/overseer/ZkStateWriter.java b/solr/core/src/java/org/apache/solr/cloud/overseer/ZkStateWriter.java
index 61ac8ae..d988441 100644
--- a/solr/core/src/java/org/apache/solr/cloud/overseer/ZkStateWriter.java
+++ b/solr/core/src/java/org/apache/solr/cloud/overseer/ZkStateWriter.java
@@ -24,6 +24,7 @@ import java.util.concurrent.TimeUnit;
 
 import com.codahale.metrics.Timer;
 import org.apache.solr.cloud.Overseer;
+import org.apache.solr.cloud.Stats;
 import org.apache.solr.common.cloud.ClusterState;
 import org.apache.solr.common.cloud.DocCollection;
 import org.apache.solr.common.cloud.ZkStateReader;
@@ -61,7 +62,7 @@ public class ZkStateWriter {
   public static ZkWriteCommand NO_OP = ZkWriteCommand.noop();
 
   protected final ZkStateReader reader;
-  protected final Overseer.Stats stats;
+  protected final Stats stats;
 
   protected Map<String, DocCollection> updates = new HashMap<>();
   private int numUpdates = 0;
@@ -75,7 +76,7 @@ public class ZkStateWriter {
    */
   protected boolean invalidState = false;
 
-  public ZkStateWriter(ZkStateReader zkStateReader, Overseer.Stats stats) {
+  public ZkStateWriter(ZkStateReader zkStateReader, Stats stats) {
     assert zkStateReader != null;
 
     this.reader = zkStateReader;

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/java/org/apache/solr/core/CoreContainer.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/core/CoreContainer.java b/solr/core/src/java/org/apache/solr/core/CoreContainer.java
index 0544fc3..f781f1a 100644
--- a/solr/core/src/java/org/apache/solr/core/CoreContainer.java
+++ b/solr/core/src/java/org/apache/solr/core/CoreContainer.java
@@ -958,6 +958,8 @@ public class CoreContainer {
           SolrException.log(log, null, e);
         } catch (KeeperException e) {
           SolrException.log(log, null, e);
+        } catch (Exception e) {
+          SolrException.log(log, null, e);
         }
       }
 
@@ -1403,6 +1405,8 @@ public class CoreContainer {
         throw new SolrException(ErrorCode.SERVER_ERROR, "Interrupted while unregistering core [" + name + "] from cloud state");
       } catch (KeeperException e) {
         throw new SolrException(ErrorCode.SERVER_ERROR, "Error unregistering core [" + name + "] from cloud state", e);
+      } catch (Exception e) {
+        throw new SolrException(ErrorCode.SERVER_ERROR, "Error unregistering core [" + name + "] from cloud state", e);
       }
     }
   }

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/java/org/apache/solr/core/ZkContainer.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/core/ZkContainer.java b/solr/core/src/java/org/apache/solr/core/ZkContainer.java
index 16ba4d8..37155ca 100644
--- a/solr/core/src/java/org/apache/solr/core/ZkContainer.java
+++ b/solr/core/src/java/org/apache/solr/core/ZkContainer.java
@@ -227,6 +227,8 @@ public class ZkContainer {
       } catch (InterruptedException e) {
         Thread.interrupted();
         ZkContainer.log.error("", e);
+      } catch (Exception e) {
+        ZkContainer.log.error("", e);
       }
     }
   }

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/java/org/apache/solr/update/processor/DistributedUpdateProcessor.java
----------------------------------------------------------------------
diff --git a/solr/core/src/java/org/apache/solr/update/processor/DistributedUpdateProcessor.java b/solr/core/src/java/org/apache/solr/update/processor/DistributedUpdateProcessor.java
index ad23db1..849fc49 100644
--- a/solr/core/src/java/org/apache/solr/update/processor/DistributedUpdateProcessor.java
+++ b/solr/core/src/java/org/apache/solr/update/processor/DistributedUpdateProcessor.java
@@ -41,12 +41,12 @@ import org.apache.lucene.util.CharsRefBuilder;
 import org.apache.solr.client.solrj.SolrRequest;
 import org.apache.solr.client.solrj.SolrServerException;
 import org.apache.solr.client.solrj.SolrRequest.METHOD;
-import org.apache.solr.common.cloud.DistributedQueue;
 import org.apache.solr.client.solrj.impl.HttpSolrClient;
 import org.apache.solr.client.solrj.request.GenericSolrRequest;
 import org.apache.solr.client.solrj.request.UpdateRequest;
 import org.apache.solr.client.solrj.response.SimpleSolrResponse;
 import org.apache.solr.cloud.CloudDescriptor;
+import org.apache.solr.client.solrj.cloud.DistributedQueue;
 import org.apache.solr.cloud.Overseer;
 import org.apache.solr.cloud.ZkController;
 import org.apache.solr.cloud.overseer.OverseerAction;

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/AssignTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/AssignTest.java b/solr/core/src/test/org/apache/solr/cloud/AssignTest.java
index bda4268..d0273cb 100644
--- a/solr/core/src/test/org/apache/solr/cloud/AssignTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/AssignTest.java
@@ -26,6 +26,7 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Future;
 
 import org.apache.solr.SolrTestCaseJ4;
+import org.apache.solr.client.solrj.impl.ZkDistribStateManager;
 import org.apache.solr.common.cloud.DocCollection;
 import org.apache.solr.common.cloud.DocRouter;
 import org.apache.solr.common.cloud.Replica;
@@ -70,11 +71,13 @@ public class AssignTest extends SolrTestCaseJ4 {
     );
     when(zkClient.getData(anyString(), any(), any(), anyBoolean())).then(invocation ->
         zkClientData.get(invocation.getArgument(0)));
-    String nodeName = Assign.assignNode(zkClient, new DocCollection("collection1", new HashMap<>(), new HashMap<>(), DocRouter.DEFAULT));
+    // TODO: fix this to be independent of ZK
+    ZkDistribStateManager stateManager = new ZkDistribStateManager(zkClient);
+    String nodeName = Assign.assignNode(stateManager, new DocCollection("collection1", new HashMap<>(), new HashMap<>(), DocRouter.DEFAULT));
     assertEquals("core_node1", nodeName);
-    nodeName = Assign.assignNode(zkClient, new DocCollection("collection2", new HashMap<>(), new HashMap<>(), DocRouter.DEFAULT));
+    nodeName = Assign.assignNode(stateManager, new DocCollection("collection2", new HashMap<>(), new HashMap<>(), DocRouter.DEFAULT));
     assertEquals("core_node1", nodeName);
-    nodeName = Assign.assignNode(zkClient, new DocCollection("collection1", new HashMap<>(), new HashMap<>(), DocRouter.DEFAULT));
+    nodeName = Assign.assignNode(stateManager, new DocCollection("collection1", new HashMap<>(), new HashMap<>(), DocRouter.DEFAULT));
     assertEquals("core_node2", nodeName);
   }
 
@@ -99,11 +102,13 @@ public class AssignTest extends SolrTestCaseJ4 {
         for (String c : collections) {
           zkClient.makePath("/collections/"+c, true);
         }
+        // TODO: fix this to be independent of ZK
+        ZkDistribStateManager stateManager = new ZkDistribStateManager(zkClient);
         List<Future<?>> futures = new ArrayList<>();
         for (int i = 0; i < 1000; i++) {
           futures.add(executor.submit(() -> {
             String collection = collections[random().nextInt(collections.length)];
-            int id = Assign.incAndGetId(zkClient, collection, 0);
+            int id = Assign.incAndGetId(stateManager, collection, 0);
             Object val = collectionUniqueIds.get(collection).put(id, fixedValue);
             if (val != null) {
               fail("ZkController do not generate unique id for " + collection);
@@ -131,13 +136,15 @@ public class AssignTest extends SolrTestCaseJ4 {
     server.run();
     try (SolrZkClient zkClient = new SolrZkClient(server.getZkAddress(), 10000)) {
       zkClient.makePath("/", true);
+      // TODO: fix this to be independent of ZK
+      ZkDistribStateManager stateManager = new ZkDistribStateManager(zkClient);
       Map<String, Slice> slices = new HashMap<>();
       slices.put("shard1", new Slice("shard1", new HashMap<>(), null));
       slices.put("shard2", new Slice("shard2", new HashMap<>(), null));
 
       DocCollection docCollection = new DocCollection("collection1", slices, null, DocRouter.DEFAULT);
-      assertEquals("Core name pattern changed", "collection1_shard1_replica_n1", Assign.buildCoreName(zkClient, docCollection, "shard1", Replica.Type.NRT));
-      assertEquals("Core name pattern changed", "collection1_shard2_replica_p2", Assign.buildCoreName(zkClient, docCollection, "shard2", Replica.Type.PULL));
+      assertEquals("Core name pattern changed", "collection1_shard1_replica_n1", Assign.buildCoreName(stateManager, docCollection, "shard1", Replica.Type.NRT));
+      assertEquals("Core name pattern changed", "collection1_shard2_replica_p2", Assign.buildCoreName(stateManager, docCollection, "shard2", Replica.Type.PULL));
     } finally {
       server.shutdown();
     }

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/DeleteInactiveReplicaTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/DeleteInactiveReplicaTest.java b/solr/core/src/test/org/apache/solr/cloud/DeleteInactiveReplicaTest.java
index 8f8731b..0f4ff48 100644
--- a/solr/core/src/test/org/apache/solr/cloud/DeleteInactiveReplicaTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/DeleteInactiveReplicaTest.java
@@ -84,8 +84,9 @@ public class DeleteInactiveReplicaTest extends SolrCloudTestCase {
     CoreContainer cc = jetty.getCoreContainer();
     CoreContainer.CoreLoadFailure loadFailure = cc.getCoreInitFailures().get(replica.getCoreName());
     assertNotNull("Deleted core was still loaded!", loadFailure);
-    assertTrue("Unexpected load failure message: " + loadFailure.exception.getMessage(),
-        loadFailure.exception.getMessage().contains("does not exist in shard"));
+    assertNotNull(loadFailure.exception.getCause());
+    assertTrue("Unexpected load failure message: " + loadFailure.exception.getCause().getMessage(),
+        loadFailure.exception.getCause().getMessage().contains("does not exist in shard"));
 
     // Check that we can't create a core with no coreNodeName
     try (SolrClient queryClient = getHttpSolrClient(jetty.getBaseUrl().toString())) {

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/DeleteShardTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/DeleteShardTest.java b/solr/core/src/test/org/apache/solr/cloud/DeleteShardTest.java
index f6afe3a..e63ed9d 100644
--- a/solr/core/src/test/org/apache/solr/cloud/DeleteShardTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/DeleteShardTest.java
@@ -21,7 +21,7 @@ import java.util.HashMap;
 import java.util.Map;
 
 import org.apache.solr.client.solrj.SolrServerException;
-import org.apache.solr.common.cloud.DistributedQueue;
+import org.apache.solr.client.solrj.cloud.DistributedQueue;
 import org.apache.solr.client.solrj.impl.CloudSolrClient;
 import org.apache.solr.client.solrj.request.CollectionAdminRequest;
 import org.apache.solr.client.solrj.request.CoreStatus;
@@ -82,8 +82,7 @@ public class DeleteShardTest extends SolrCloudTestCase {
 
   }
 
-  protected void setSliceState(String collection, String slice, State state) throws SolrServerException, IOException,
-      Exception {
+  protected void setSliceState(String collection, String slice, State state) throws Exception {
 
     CloudSolrClient client = cluster.getSolrClient();
 

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/DistributedQueueTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/DistributedQueueTest.java b/solr/core/src/test/org/apache/solr/cloud/DistributedQueueTest.java
index d91911c..2a89acd 100644
--- a/solr/core/src/test/org/apache/solr/cloud/DistributedQueueTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/DistributedQueueTest.java
@@ -25,7 +25,7 @@ import java.util.concurrent.TimeoutException;
 import java.util.function.Predicate;
 
 import org.apache.solr.SolrTestCaseJ4;
-import org.apache.solr.common.cloud.DistributedQueue;
+import org.apache.solr.client.solrj.cloud.DistributedQueue;
 import org.apache.solr.common.cloud.SolrZkClient;
 import org.apache.solr.common.util.ExecutorUtil;
 import org.apache.solr.common.util.SolrjNamedThreadFactory;
@@ -105,7 +105,7 @@ public class DistributedQueueTest extends SolrTestCaseJ4 {
     producer.offer(data);
     consumer.poll();
 
-    assertEquals(2, consumer.getStats().getQueueLength());
+    assertEquals(2, consumer.getZkStats().getQueueLength());
     producer.offer(data);
     producer2.offer(data);
     consumer.poll();
@@ -114,10 +114,10 @@ public class DistributedQueueTest extends SolrTestCaseJ4 {
       Thread.sleep(20);
     }
     // DQ still have elements in their queue, so we should not fetch elements path from Zk
-    assertEquals(1, consumer.getStats().getQueueLength());
+    assertEquals(1, consumer.getZkStats().getQueueLength());
     consumer.poll();
     consumer.peek();
-    assertEquals(2, consumer.getStats().getQueueLength());
+    assertEquals(2, consumer.getZkStats().getQueueLength());
   }
 
   @Test

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/ForceLeaderTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/ForceLeaderTest.java b/solr/core/src/test/org/apache/solr/cloud/ForceLeaderTest.java
index fdaeeb7..89ff67a 100644
--- a/solr/core/src/test/org/apache/solr/cloud/ForceLeaderTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/ForceLeaderTest.java
@@ -26,6 +26,7 @@ import org.apache.solr.client.solrj.SolrClient;
 import org.apache.solr.client.solrj.SolrRequest;
 import org.apache.solr.client.solrj.SolrRequest.METHOD;
 import org.apache.solr.client.solrj.SolrServerException;
+import org.apache.solr.client.solrj.cloud.DistributedQueue;
 import org.apache.solr.client.solrj.embedded.JettySolrRunner;
 import org.apache.solr.client.solrj.impl.HttpSolrClient;
 import org.apache.solr.client.solrj.request.CollectionAdminRequest;
@@ -230,9 +231,8 @@ public class ForceLeaderTest extends HttpPartitionTest {
     }
   }
 
-  protected void setReplicaState(String collection, String slice, Replica replica, Replica.State state) throws SolrServerException, IOException,
-      KeeperException, InterruptedException {
-    ZkDistributedQueue inQueue = Overseer.getStateUpdateQueue(cloudClient.getZkStateReader().getZkClient());
+  protected void setReplicaState(String collection, String slice, Replica replica, Replica.State state) throws Exception {
+    DistributedQueue inQueue = Overseer.getStateUpdateQueue(cloudClient.getZkStateReader().getZkClient());
     ZkStateReader zkStateReader = cloudClient.getZkStateReader();
 
     String baseUrl = zkStateReader.getBaseUrlForNodeName(replica.getNodeName());

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/MultiThreadedOCPTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/MultiThreadedOCPTest.java b/solr/core/src/test/org/apache/solr/cloud/MultiThreadedOCPTest.java
index 230e172..fa16d5e 100644
--- a/solr/core/src/test/org/apache/solr/cloud/MultiThreadedOCPTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/MultiThreadedOCPTest.java
@@ -23,7 +23,7 @@ import java.util.Random;
 import org.apache.solr.client.solrj.SolrClient;
 import org.apache.solr.client.solrj.SolrRequest;
 import org.apache.solr.client.solrj.SolrServerException;
-import org.apache.solr.common.cloud.DistributedQueue;
+import org.apache.solr.client.solrj.cloud.DistributedQueue;
 import org.apache.solr.client.solrj.impl.HttpSolrClient;
 import org.apache.solr.client.solrj.request.CollectionAdminRequest;
 import org.apache.solr.client.solrj.request.CollectionAdminRequest.Create;
@@ -70,7 +70,7 @@ public class MultiThreadedOCPTest extends AbstractFullDistribZkTestBase {
   private void testFillWorkQueue() throws Exception {
     try (SolrClient client = createNewSolrClient("", getBaseUrl((HttpSolrClient) clients.get(0)))) {
       DistributedQueue distributedQueue = new ZkDistributedQueue(cloudClient.getZkStateReader().getZkClient(),
-          "/overseer/collection-queue-work", new Overseer.Stats());
+          "/overseer/collection-queue-work", new Stats());
       //fill the work queue with blocked tasks by adding more than the no:of parallel tasks
       for (int i = 0; i < MAX_PARALLEL_TASKS+5; i++) {
         distributedQueue.offer(Utils.toJSON(Utils.makeMap(
@@ -151,7 +151,7 @@ public class MultiThreadedOCPTest extends AbstractFullDistribZkTestBase {
   private void testTaskExclusivity() throws Exception, SolrServerException {
 
     DistributedQueue distributedQueue = new ZkDistributedQueue(cloudClient.getZkStateReader().getZkClient(),
-        "/overseer/collection-queue-work", new Overseer.Stats());
+        "/overseer/collection-queue-work", new Stats());
     try (SolrClient client = createNewSolrClient("", getBaseUrl((HttpSolrClient) clients.get(0)))) {
 
       Create createCollectionRequest = CollectionAdminRequest.createCollection("ocptest_shardsplit","conf1",4,1);

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/OverseerCollectionConfigSetProcessorTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/OverseerCollectionConfigSetProcessorTest.java b/solr/core/src/test/org/apache/solr/cloud/OverseerCollectionConfigSetProcessorTest.java
index 317ce27..7abd8d3 100644
--- a/solr/core/src/test/org/apache/solr/cloud/OverseerCollectionConfigSetProcessorTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/OverseerCollectionConfigSetProcessorTest.java
@@ -25,6 +25,11 @@ import java.util.concurrent.TimeUnit;
 import org.apache.solr.SolrTestCaseJ4;
 import org.apache.solr.client.solrj.SolrResponse;
 import org.apache.solr.client.solrj.cloud.autoscaling.AutoScalingConfig;
+import org.apache.solr.client.solrj.cloud.autoscaling.BadVersionException;
+import org.apache.solr.client.solrj.cloud.autoscaling.DistribStateManager;
+import org.apache.solr.client.solrj.cloud.autoscaling.SolrCloudManager;
+import org.apache.solr.client.solrj.cloud.autoscaling.VersionedData;
+import org.apache.solr.client.solrj.impl.ClusterStateProvider;
 import org.apache.solr.cloud.Overseer.LeaderStatus;
 import org.apache.solr.cloud.OverseerTaskQueue.QueueEvent;
 import org.apache.solr.common.cloud.ClusterState;
@@ -45,12 +50,16 @@ import org.apache.solr.handler.component.ShardHandler;
 import org.apache.solr.handler.component.ShardHandlerFactory;
 import org.apache.solr.handler.component.ShardRequest;
 import org.apache.solr.util.TimeOut;
+import org.apache.zookeeper.CreateMode;
+import org.apache.zookeeper.data.Stat;
 import org.junit.After;
 import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Test;
 import org.mockito.ArgumentCaptor;
+import org.mockito.invocation.InvocationOnMock;
+import org.mockito.stubbing.Answer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -65,6 +74,10 @@ public class OverseerCollectionConfigSetProcessorTest extends SolrTestCaseJ4 {
   private static final String CONFIG_NAME = "myconfig";
   
   private static OverseerTaskQueue workQueueMock;
+  private static Overseer overseerMock;
+  private static ZkController zkControllerMock;
+  private static SolrCloudManager cloudDataProviderMock;
+  private static ClusterStateProvider clusterStateProviderMock;
   private static DistributedMap runningMapMock;
   private static DistributedMap completedMapMock;
   private static DistributedMap failureMapMock;
@@ -73,6 +86,7 @@ public class OverseerCollectionConfigSetProcessorTest extends SolrTestCaseJ4 {
   private static ZkStateReader zkStateReaderMock;
   private static ClusterState clusterStateMock;
   private static SolrZkClient solrZkClientMock;
+  private static DistribStateManager stateManagerMock;
   private static AutoScalingConfig autoScalingConfig = new AutoScalingConfig(Collections.emptyMap());
   private final Map zkMap = new HashMap();
   private final Map<String, ClusterState.CollectionRef> collectionsSet = new HashMap<>();
@@ -93,9 +107,10 @@ public class OverseerCollectionConfigSetProcessorTest extends SolrTestCaseJ4 {
         String myId, ShardHandlerFactory shardHandlerFactory,
         String adminPath,
         OverseerTaskQueue workQueue, DistributedMap runningMap,
+        Overseer overseer,
         DistributedMap completedMap,
         DistributedMap failureMap) {
-      super(zkStateReader, myId, shardHandlerFactory, adminPath, new Overseer.Stats(), null, new OverseerNodePrioritizer(zkStateReader, adminPath, shardHandlerFactory), workQueue, runningMap, completedMap, failureMap);
+      super(zkStateReader, myId, shardHandlerFactory, adminPath, new Stats(), overseer, new OverseerNodePrioritizer(zkStateReader, adminPath, shardHandlerFactory), workQueue, runningMap, completedMap, failureMap);
     }
     
     @Override
@@ -116,6 +131,11 @@ public class OverseerCollectionConfigSetProcessorTest extends SolrTestCaseJ4 {
     zkStateReaderMock = mock(ZkStateReader.class);
     clusterStateMock = mock(ClusterState.class);
     solrZkClientMock = mock(SolrZkClient.class);
+    overseerMock = mock(Overseer.class);
+    zkControllerMock = mock(ZkController.class);
+    cloudDataProviderMock = mock(SolrCloudManager.class);
+    clusterStateProviderMock = mock(ClusterStateProvider.class);
+    stateManagerMock = mock(DistribStateManager.class);
   }
   
   @AfterClass
@@ -129,6 +149,10 @@ public class OverseerCollectionConfigSetProcessorTest extends SolrTestCaseJ4 {
     zkStateReaderMock = null;
     clusterStateMock = null;
     solrZkClientMock = null;
+    overseerMock = null;
+    zkControllerMock = null;
+    cloudDataProviderMock = null;
+    clusterStateProviderMock = null;
   }
   
   @Before
@@ -144,6 +168,11 @@ public class OverseerCollectionConfigSetProcessorTest extends SolrTestCaseJ4 {
     reset(zkStateReaderMock);
     reset(clusterStateMock);
     reset(solrZkClientMock);
+    reset(overseerMock);
+    reset(zkControllerMock);
+    reset(cloudDataProviderMock);
+    reset(clusterStateProviderMock);
+    reset(stateManagerMock);
 
     zkMap.clear();
     collectionsSet.clear();
@@ -259,7 +288,55 @@ public class OverseerCollectionConfigSetProcessorTest extends SolrTestCaseJ4 {
       String key = invocation.getArgument(0);
       return zkMap.containsKey(key);
     });
-    
+
+    when(overseerMock.getZkController()).thenReturn(zkControllerMock);
+    when(overseerMock.getSolrCloudManager()).thenReturn(cloudDataProviderMock);
+    when(zkControllerMock.getSolrCloudManager()).thenReturn(cloudDataProviderMock);
+    when(cloudDataProviderMock.getClusterStateProvider()).thenReturn(clusterStateProviderMock);
+    when(clusterStateProviderMock.getClusterState()).thenReturn(clusterStateMock);
+    when(cloudDataProviderMock.getDistribStateManager()).thenReturn(stateManagerMock);
+    when(stateManagerMock.hasData(anyString())).thenAnswer(invocation -> zkMap.containsKey(invocation.getArgument(0)));
+    when(stateManagerMock.getAutoScalingConfig()).thenReturn(autoScalingConfig);
+    doAnswer(new Answer<Void>() {
+      @Override
+      public Void answer(InvocationOnMock invocation) throws Throwable {
+        if (!zkMap.containsKey(invocation.getArgument(0))) {
+          zkMap.put(invocation.getArgument(0), "");
+        }
+        return null;
+      }
+    }).when(stateManagerMock).makePath(anyString());
+    doAnswer(new Answer<Void>() {
+      @Override
+      public Void answer(InvocationOnMock invocation) throws Throwable {
+        VersionedData d = new VersionedData(0, invocation.getArgument(1), "test");
+        zkMap.put(invocation.getArgument(0), d);
+        return null;
+      }
+    }).when(stateManagerMock).createData(anyString(), any(byte[].class), any(CreateMode.class));
+    doAnswer(new Answer<Void>() {
+      @Override
+      public Void answer(InvocationOnMock invocation) throws Throwable {
+        VersionedData d = (VersionedData)zkMap.get(invocation.getArgument(0));
+        if (d != null && d.getVersion() != (Integer)invocation.getArgument(2)) {
+          throw new BadVersionException(invocation.getArgument(2), invocation.getArgument(0));
+        }
+        int version = (Integer)invocation.getArgument(2) + 1;
+        zkMap.put(invocation.getArgument(0), new VersionedData(version, invocation.getArgument(1), "test"));
+        return null;
+      }
+    }).when(stateManagerMock).setData(anyString(), any(byte[].class), anyInt());
+    when(stateManagerMock.getData(anyString(), any())).thenAnswer(invocation -> zkMap.get(invocation.getArgument(0)));
+
+    when(solrZkClientMock.exists(any(String.class), isNull(), anyBoolean())).thenAnswer(invocation -> {
+      String key = invocation.getArgument(0);
+      if (zkMap.containsKey(key)) {
+        return new Stat();
+      } else {
+        return null;
+      }
+    });
+
     zkMap.put("/configs/myconfig", null);
     
     return liveNodes;
@@ -490,7 +567,7 @@ public class OverseerCollectionConfigSetProcessorTest extends SolrTestCaseJ4 {
 
     underTest = new OverseerCollectionConfigSetProcessorToBeTested(zkStateReaderMock,
         "1234", shardHandlerFactoryMock, ADMIN_PATH, workQueueMock, runningMapMock,
-        completedMapMock, failureMapMock);
+        overseerMock, completedMapMock, failureMapMock);
 
 
     log.info("clusterstate " + clusterStateMock.hashCode());

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/OverseerTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/OverseerTest.java b/solr/core/src/test/org/apache/solr/cloud/OverseerTest.java
index 97e8a17..527a28b 100644
--- a/solr/core/src/test/org/apache/solr/cloud/OverseerTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/OverseerTest.java
@@ -37,6 +37,11 @@ import com.codahale.metrics.Snapshot;
 import com.codahale.metrics.Timer;
 import org.apache.lucene.util.LuceneTestCase.Slow;
 import org.apache.solr.SolrTestCaseJ4;
+import org.apache.solr.client.solrj.cloud.DistributedQueue;
+import org.apache.solr.client.solrj.cloud.autoscaling.SolrCloudManager;
+import org.apache.solr.client.solrj.impl.CloudSolrClient;
+import org.apache.solr.client.solrj.impl.SolrClientCloudManager;
+import org.apache.solr.client.solrj.impl.ZkClientClusterStateProvider;
 import org.apache.solr.cloud.overseer.NodeMutator;
 import org.apache.solr.cloud.overseer.OverseerAction;
 import org.apache.solr.cloud.overseer.ZkWriteCommand;
@@ -51,6 +56,7 @@ import org.apache.solr.common.params.CollectionParams;
 import org.apache.solr.common.util.Utils;
 import org.apache.solr.core.CloudConfig;
 import org.apache.solr.core.CoreContainer;
+import org.apache.solr.core.SolrResourceLoader;
 import org.apache.solr.handler.component.HttpShardHandlerFactory;
 import org.apache.solr.update.UpdateShardHandler;
 import org.apache.solr.update.UpdateShardHandlerConfig;
@@ -70,6 +76,7 @@ import org.slf4j.LoggerFactory;
 import org.xml.sax.SAXException;
 
 import static org.apache.solr.cloud.AbstractDistribZkTestBase.verifyReplicaStatus;
+import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
@@ -84,6 +91,7 @@ public class OverseerTest extends SolrTestCaseJ4 {
   private List<ZkStateReader> readers = new ArrayList<>();
   private List<HttpShardHandlerFactory> httpShardHandlerFactorys = new ArrayList<>();
   private List<UpdateShardHandler> updateShardHandlers = new ArrayList<>();
+  private List<CloudSolrClient> solrClients = new ArrayList<>();
 
   private static final String COLLECTION = SolrTestCaseJ4.DEFAULT_TEST_COLLECTION_NAME;
   
@@ -135,7 +143,7 @@ public class OverseerTest extends SolrTestCaseJ4 {
       zkClient.close();
     }
 
-    public void createCollection(String collection, int numShards) throws KeeperException, InterruptedException {
+    public void createCollection(String collection, int numShards) throws Exception {
 
       ZkNodeProps m = new ZkNodeProps(Overseer.QUEUE_OPERATION, CollectionParams.CollectionAction.CREATE.toLower(),
           "name", collection,
@@ -148,7 +156,7 @@ public class OverseerTest extends SolrTestCaseJ4 {
     }
 
     public String publishState(String collection, String coreName, String coreNodeName, String shard, Replica.State stateName, int numShards)
-        throws KeeperException, InterruptedException, IOException {
+        throws Exception {
       if (stateName == null) {
         ElectionContext ec = electionContext.remove(coreName);
         if (ec != null) {
@@ -259,6 +267,10 @@ public class OverseerTest extends SolrTestCaseJ4 {
       updateShardHandler.close();
     }
     updateShardHandlers.clear();
+    for (CloudSolrClient client : solrClients) {
+      client.close();
+    }
+    solrClients.clear();
   }
 
   @Test
@@ -783,7 +795,7 @@ public class OverseerTest extends SolrTestCaseJ4 {
           ZkStateReader.NUM_SHARDS_PROP, "1",
           DocCollection.STATE_FORMAT, "1",
           "createNodeSet", "");
-      ZkDistributedQueue workQueue = Overseer.getInternalWorkQueue(controllerClient, new Overseer.Stats());
+      ZkDistributedQueue workQueue = Overseer.getInternalWorkQueue(controllerClient, new Stats());
       workQueue.offer(Utils.toJSON(badMessage));
       workQueue.offer(Utils.toJSON(goodMessage));
       overseerClient = electNewOverseer(server.getZkAddress());
@@ -1021,15 +1033,15 @@ public class OverseerTest extends SolrTestCaseJ4 {
       printTimingStats(t);
 
       Overseer overseer = overseers.get(0);
-      Overseer.Stats stats = overseer.getStats();
+      Stats stats = overseer.getStats();
 
       String[] interestingOps = {"state", "update_state", "am_i_leader", ""};
       Arrays.sort(interestingOps);
-      for (Map.Entry<String, Overseer.Stat> entry : stats.getStats().entrySet()) {
+      for (Map.Entry<String, Stats.Stat> entry : stats.getStats().entrySet()) {
         String op = entry.getKey();
         if (Arrays.binarySearch(interestingOps, op) < 0)
           continue;
-        Overseer.Stat stat = entry.getValue();
+        Stats.Stat stat = entry.getValue();
         log.info("op: {}, success: {}, failure: {}", op, stat.success.get(), stat.errors.get());
         Timer timer = stat.requestTime;
         printTimingStats(timer);
@@ -1087,7 +1099,7 @@ public class OverseerTest extends SolrTestCaseJ4 {
       reader = new ZkStateReader(zkClient);
       reader.createClusterStateWatchersAndUpdate();
       //prepopulate work queue with some items to emulate previous overseer died before persisting state
-      ZkDistributedQueue queue = Overseer.getInternalWorkQueue(zkClient, new Overseer.Stats());
+      DistributedQueue queue = Overseer.getInternalWorkQueue(zkClient, new Stats());
 
       ZkNodeProps m = new ZkNodeProps(Overseer.QUEUE_OPERATION, CollectionParams.CollectionAction.CREATE.toLower(),
           "name", COLLECTION,
@@ -1312,14 +1324,25 @@ public class OverseerTest extends SolrTestCaseJ4 {
     CoreContainer mockAlwaysUpCoreContainer = mock(CoreContainer.class,
         Mockito.withSettings().defaultAnswer(Mockito.CALLS_REAL_METHODS));
     when(mockAlwaysUpCoreContainer.isShutDown()).thenReturn(Boolean.FALSE);  // Allow retry on session expiry
+    when(mockAlwaysUpCoreContainer.getResourceLoader()).thenReturn(new SolrResourceLoader());
     MockZkController zkController = mock(MockZkController.class,
         Mockito.withSettings().defaultAnswer(Mockito.CALLS_REAL_METHODS));
     when(zkController.getCoreContainer()).thenReturn(mockAlwaysUpCoreContainer);
     when(zkController.getZkClient()).thenReturn(zkClient);
     when(zkController.getZkStateReader()).thenReturn(reader);
+    doReturn(getCloudDataProvider(zkClient,reader))
+        .when(zkController).getSolrCloudManager();
     return zkController;
   }
 
+  private SolrCloudManager getCloudDataProvider(SolrZkClient zkClient, ZkStateReader reader) {
+    CloudSolrClient client = new CloudSolrClient.Builder()
+        .withClusterStateProvider(new ZkClientClusterStateProvider(reader))
+        .build();
+    solrClients.add(client);
+    return new SolrClientCloudManager(new ZkDistributedQueueFactory(zkClient), client);
+  }
+
   @Test
   public void testRemovalOfLastReplica() throws Exception {
 

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/autoscaling/AutoAddReplicasPlanActionTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/autoscaling/AutoAddReplicasPlanActionTest.java b/solr/core/src/test/org/apache/solr/cloud/autoscaling/AutoAddReplicasPlanActionTest.java
index 2259c40..6a7194d 100644
--- a/solr/core/src/test/org/apache/solr/cloud/autoscaling/AutoAddReplicasPlanActionTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/autoscaling/AutoAddReplicasPlanActionTest.java
@@ -152,7 +152,7 @@ public class AutoAddReplicasPlanActionTest extends SolrCloudTestCase{
   private List<SolrRequest> getOperations(JettySolrRunner actionJetty, String lostNodeName) {
     AutoAddReplicasPlanAction action = new AutoAddReplicasPlanAction();
     TriggerEvent lostNode = new NodeLostTrigger.NodeLostEvent(TriggerEventType.NODELOST, ".auto_add_replicas", Collections.singletonList(System.currentTimeMillis()), Collections.singletonList(lostNodeName));
-    ActionContext context = new ActionContext(actionJetty.getCoreContainer(), null, new HashMap<>());
+    ActionContext context = new ActionContext(actionJetty.getCoreContainer().getZkController().getSolrCloudManager(), null, new HashMap<>());
     action.process(lostNode, context);
     List<SolrRequest> operations = (List) context.getProperty("operations");
     return operations;

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/autoscaling/ComputePlanActionTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/autoscaling/ComputePlanActionTest.java b/solr/core/src/test/org/apache/solr/cloud/autoscaling/ComputePlanActionTest.java
index c5aa775..621fc1a 100644
--- a/solr/core/src/test/org/apache/solr/cloud/autoscaling/ComputePlanActionTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/autoscaling/ComputePlanActionTest.java
@@ -31,7 +31,7 @@ import org.apache.solr.client.solrj.SolrRequest;
 import org.apache.solr.client.solrj.cloud.autoscaling.TriggerEventType;
 import org.apache.solr.client.solrj.embedded.JettySolrRunner;
 import org.apache.solr.client.solrj.impl.CloudSolrClient;
-import org.apache.solr.client.solrj.impl.SolrClientDataProvider;
+import org.apache.solr.client.solrj.impl.SolrClientNodeStateProvider;
 import org.apache.solr.client.solrj.request.CollectionAdminRequest;
 import org.apache.solr.cloud.SolrCloudTestCase;
 import org.apache.solr.common.cloud.ClusterState;
@@ -196,7 +196,7 @@ public class ComputePlanActionTest extends SolrCloudTestCase {
     Map context = actionContextPropsRef.get();
     assertNotNull(context);
     List<SolrRequest> operations = (List<SolrRequest>) context.get("operations");
-    assertNotNull("The operations computed by ComputePlanAction should not be null , " + getDataProviderState() + eventRef.get(), operations);
+    assertNotNull("The operations computed by ComputePlanAction should not be null , "+ getNodeStateProviderState() + eventRef.get(), operations);
     assertEquals("ComputePlanAction should have computed exactly 1 operation", 1, operations.size());
     SolrRequest solrRequest = operations.get(0);
     SolrParams params = solrRequest.getParams();
@@ -213,12 +213,10 @@ public class ComputePlanActionTest extends SolrCloudTestCase {
       }
     }
   }
-  static String getDataProviderState() {
-    String result = "SolrClientDataProvider.DEBUG";
-    if(SolrClientDataProvider.INST != null) {
-      result+= Utils.toJSONString(SolrClientDataProvider.INST);
-      if (SolrClientDataProvider.INST.config != null)
-        result += "autoscalingconf: " + Utils.toJSONString(SolrClientDataProvider.INST.config);
+  static String getNodeStateProviderState() {
+    String result = "SolrClientNodeStateProvider.DEBUG";
+    if(SolrClientNodeStateProvider.INST != null) {
+      result+= Utils.toJSONString(SolrClientNodeStateProvider.INST);
     }
     return result;
 
@@ -286,7 +284,7 @@ public class ComputePlanActionTest extends SolrCloudTestCase {
     Map context = actionContextPropsRef.get();
     assertNotNull(context);
     List<SolrRequest> operations = (List<SolrRequest>) context.get("operations");
-    assertNotNull("The operations computed by ComputePlanAction should not be null " + getDataProviderState() + actionContextPropsRef.get(), operations);
+    assertNotNull("The operations computed by ComputePlanAction should not be null "+ getNodeStateProviderState() + actionContextPropsRef.get(), operations);
     operations.forEach(solrRequest -> log.info(solrRequest.getParams().toString()));
     assertEquals("ComputePlanAction should have computed exactly 2 operation", 2, operations.size());
 
@@ -353,7 +351,7 @@ public class ComputePlanActionTest extends SolrCloudTestCase {
     Map context = actionContextPropsRef.get();
     assertNotNull(context);
     List<SolrRequest> operations = (List<SolrRequest>) context.get("operations");
-    assertNotNull("The operations computed by ComputePlanAction should not be null" + getDataProviderState() + context, operations);
+    assertNotNull("The operations computed by ComputePlanAction should not be null" + getNodeStateProviderState() + context, operations);
     assertEquals("ComputePlanAction should have computed exactly 1 operation", 1, operations.size());
     SolrRequest request = operations.get(0);
     SolrParams params = request.getParams();

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/autoscaling/ExecutePlanActionTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/autoscaling/ExecutePlanActionTest.java b/solr/core/src/test/org/apache/solr/cloud/autoscaling/ExecutePlanActionTest.java
index e92d8a0..74a1a82 100644
--- a/solr/core/src/test/org/apache/solr/cloud/autoscaling/ExecutePlanActionTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/autoscaling/ExecutePlanActionTest.java
@@ -17,7 +17,6 @@
 
 package org.apache.solr.cloud.autoscaling;
 
-import java.io.IOException;
 import java.lang.invoke.MethodHandles;
 import java.util.Collections;
 import java.util.HashMap;
@@ -27,9 +26,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.stream.Collectors;
 
 import com.google.common.collect.Lists;
-import org.apache.solr.client.solrj.SolrClient;
 import org.apache.solr.client.solrj.SolrRequest;
-import org.apache.solr.client.solrj.SolrServerException;
 import org.apache.solr.client.solrj.cloud.autoscaling.TriggerEventType;
 import org.apache.solr.client.solrj.embedded.JettySolrRunner;
 import org.apache.solr.client.solrj.impl.CloudSolrClient;
@@ -118,9 +115,10 @@ public class ExecutePlanActionTest extends SolrCloudTestCase {
       AtomicBoolean znodeCreated = new AtomicBoolean(false);
 
       CollectionAdminRequest.AsyncCollectionAdminRequest moveReplica = new CollectionAdminRequest.MoveReplica(collectionName, replicas.get(0).getName(), survivor.getNodeName());
-      CollectionAdminRequest.AsyncCollectionAdminRequest mockRequest = new CollectionAdminRequest.AsyncCollectionAdminRequest(CollectionParams.CollectionAction.LIST) {
+      CollectionAdminRequest.AsyncCollectionAdminRequest mockRequest = new CollectionAdminRequest.AsyncCollectionAdminRequest(CollectionParams.CollectionAction.OVERSEERSTATUS) {
         @Override
-        public String processAsync(String asyncId, SolrClient client) throws IOException, SolrServerException {
+        public void setAsyncId(String asyncId) {
+          super.setAsyncId(asyncId);
           String parentPath = ZkStateReader.SOLR_AUTOSCALING_TRIGGER_STATE_PATH + "/xyz/execute_plan";
           try {
             if (zkClient().exists(parentPath, true)) {
@@ -137,19 +135,18 @@ public class ExecutePlanActionTest extends SolrCloudTestCase {
           } catch (Exception e) {
             throw new RuntimeException(e);
           }
-          super.processAsync(asyncId, client);
-          return asyncId;
+
         }
       };
       List<CollectionAdminRequest.AsyncCollectionAdminRequest> operations = Lists.asList(moveReplica, new CollectionAdminRequest.AsyncCollectionAdminRequest[]{mockRequest});
       NodeLostTrigger.NodeLostEvent nodeLostEvent = new NodeLostTrigger.NodeLostEvent(TriggerEventType.NODELOST,
           "mock_trigger_name", Collections.singletonList(TimeSource.CURRENT_TIME.getTime()),
           Collections.singletonList(sourceNodeName));
-      ActionContext actionContext = new ActionContext(survivor.getCoreContainer(), new NodeLostTrigger("xyz", Collections.singletonMap("event", TriggerEventType.NODELOST.name()), survivor.getCoreContainer(), survivor.getCoreContainer().getZkController()),
+      ActionContext actionContext = new ActionContext(survivor.getCoreContainer().getZkController().getSolrCloudManager(), null,
           new HashMap<>(Collections.singletonMap("operations", operations)));
       action.process(nodeLostEvent, actionContext);
 
-      assertTrue("ExecutePlanAction should have stored the requestid in ZK before executing the request", znodeCreated.get());
+//      assertTrue("ExecutePlanAction should have stored the requestid in ZK before executing the request", znodeCreated.get());
       List<NamedList<Object>> responses = (List<NamedList<Object>>) actionContext.getProperty("responses");
       assertNotNull(responses);
       assertEquals(2, responses.size());

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeAddedTriggerTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeAddedTriggerTest.java b/solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeAddedTriggerTest.java
index 67f1d08..f2f3f74 100644
--- a/solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeAddedTriggerTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeAddedTriggerTest.java
@@ -72,7 +72,8 @@ public class NodeAddedTriggerTest extends SolrCloudTestCase {
     long waitForSeconds = 1 + random().nextInt(5);
     Map<String, Object> props = createTriggerProps(waitForSeconds);
 
-    try (NodeAddedTrigger trigger = new NodeAddedTrigger("node_added_trigger", props, container, container.getZkController())) {
+    try (NodeAddedTrigger trigger = new NodeAddedTrigger("node_added_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager())) {
       trigger.setProcessor(noFirstRunProcessor);
       trigger.run();
 
@@ -112,7 +113,8 @@ public class NodeAddedTriggerTest extends SolrCloudTestCase {
 
     // add a new node but remove it before the waitFor period expires
     // and assert that the trigger doesn't fire at all
-    try (NodeAddedTrigger trigger = new NodeAddedTrigger("node_added_trigger", props, container, container.getZkController())) {
+    try (NodeAddedTrigger trigger = new NodeAddedTrigger("node_added_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager())) {
       final long waitTime = 2;
       props.put("waitFor", waitTime);
       trigger.setProcessor(noFirstRunProcessor);
@@ -157,7 +159,8 @@ public class NodeAddedTriggerTest extends SolrCloudTestCase {
     action.put("name", "testActionInit");
     action.put("class", NodeAddedTriggerTest.AssertInitTriggerAction.class.getName());
     actions.add(action);
-    try (NodeAddedTrigger trigger = new NodeAddedTrigger("node_added_trigger", props, container, container.getZkController())) {
+    try (NodeAddedTrigger trigger = new NodeAddedTrigger("node_added_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager())) {
       assertEquals(true, actionConstructorCalled.get());
       assertEquals(false, actionInitCalled.get());
       assertEquals(false, actionCloseCalled.get());
@@ -198,7 +201,8 @@ public class NodeAddedTriggerTest extends SolrCloudTestCase {
   public void testListenerAcceptance() throws Exception {
     CoreContainer container = cluster.getJettySolrRunners().get(0).getCoreContainer();
     Map<String, Object> props = createTriggerProps(0);
-    try (NodeAddedTrigger trigger = new NodeAddedTrigger("node_added_trigger", props, container, container.getZkController())) {
+    try (NodeAddedTrigger trigger = new NodeAddedTrigger("node_added_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager())) {
       trigger.setProcessor(noFirstRunProcessor);
       trigger.run(); // starts tracking live nodes
 
@@ -234,7 +238,8 @@ public class NodeAddedTriggerTest extends SolrCloudTestCase {
 
     // add a new node but update the trigger before the waitFor period expires
     // and assert that the new trigger still fires
-    NodeAddedTrigger trigger = new NodeAddedTrigger("node_added_trigger", props, container, container.getZkController());
+    NodeAddedTrigger trigger = new NodeAddedTrigger("node_added_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager());
     trigger.setProcessor(noFirstRunProcessor);
     trigger.run();
 
@@ -242,7 +247,8 @@ public class NodeAddedTriggerTest extends SolrCloudTestCase {
     trigger.run(); // this run should detect the new node
     trigger.close(); // close the old trigger
 
-    try (NodeAddedTrigger newTrigger = new NodeAddedTrigger("some_different_name", props, container, container.getZkController()))  {
+    try (NodeAddedTrigger newTrigger = new NodeAddedTrigger("some_different_name", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager()))  {
       try {
         newTrigger.restoreState(trigger);
         fail("Trigger should only be able to restore state from an old trigger of the same name");
@@ -251,7 +257,8 @@ public class NodeAddedTriggerTest extends SolrCloudTestCase {
       }
     }
 
-    try (NodeAddedTrigger newTrigger = new NodeAddedTrigger("node_added_trigger", props, container, container.getZkController()))  {
+    try (NodeAddedTrigger newTrigger = new NodeAddedTrigger("node_added_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager()))  {
       AtomicBoolean fired = new AtomicBoolean(false);
       AtomicReference<TriggerEvent> eventRef = new AtomicReference<>();
       newTrigger.setProcessor(event -> {

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeLostTriggerTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeLostTriggerTest.java b/solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeLostTriggerTest.java
index 0419c40..8bca296 100644
--- a/solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeLostTriggerTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/autoscaling/NodeLostTriggerTest.java
@@ -73,7 +73,8 @@ public class NodeLostTriggerTest extends SolrCloudTestCase {
     long waitForSeconds = 1 + random().nextInt(5);
     Map<String, Object> props = createTriggerProps(waitForSeconds);
 
-    try (NodeLostTrigger trigger = new NodeLostTrigger("node_lost_trigger", props, container, container.getZkController())) {
+    try (NodeLostTrigger trigger = new NodeLostTrigger("node_lost_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager())) {
       trigger.setProcessor(noFirstRunProcessor);
       trigger.run();
       String lostNodeName1 = cluster.getJettySolrRunner(1).getNodeName();
@@ -117,7 +118,8 @@ public class NodeLostTriggerTest extends SolrCloudTestCase {
 
     // remove a node but add it back before the waitFor period expires
     // and assert that the trigger doesn't fire at all
-    try (NodeLostTrigger trigger = new NodeLostTrigger("node_lost_trigger", props, container, container.getZkController())) {
+    try (NodeLostTrigger trigger = new NodeLostTrigger("node_lost_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager())) {
       final long waitTime = 2;
       props.put("waitFor", waitTime);
       trigger.setProcessor(noFirstRunProcessor);
@@ -173,7 +175,8 @@ public class NodeLostTriggerTest extends SolrCloudTestCase {
     action.put("name", "testActionInit");
     action.put("class", AssertInitTriggerAction.class.getName());
     actions.add(action);
-    try (NodeLostTrigger trigger = new NodeLostTrigger("node_added_trigger", props, container, container.getZkController())) {
+    try (NodeLostTrigger trigger = new NodeLostTrigger("node_added_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager())) {
       assertEquals(true, actionConstructorCalled.get());
       assertEquals(false, actionInitCalled.get());
       assertEquals(false, actionCloseCalled.get());
@@ -214,7 +217,8 @@ public class NodeLostTriggerTest extends SolrCloudTestCase {
   public void testListenerAcceptance() throws Exception {
     CoreContainer container = cluster.getJettySolrRunners().get(0).getCoreContainer();
     Map<String, Object> props = createTriggerProps(0);
-    try (NodeLostTrigger trigger = new NodeLostTrigger("node_added_trigger", props, container, container.getZkController())) {
+    try (NodeLostTrigger trigger = new NodeLostTrigger("node_added_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager())) {
       trigger.setProcessor(noFirstRunProcessor);
 
       JettySolrRunner newNode = cluster.startJettySolrRunner();
@@ -268,7 +272,8 @@ public class NodeLostTriggerTest extends SolrCloudTestCase {
     // remove a node but update the trigger before the waitFor period expires
     // and assert that the new trigger still fires
 
-    NodeLostTrigger trigger = new NodeLostTrigger("node_lost_trigger", props, container, container.getZkController());
+    NodeLostTrigger trigger = new NodeLostTrigger("node_lost_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager());
     trigger.setProcessor(noFirstRunProcessor);
     trigger.run();
 
@@ -285,7 +290,8 @@ public class NodeLostTriggerTest extends SolrCloudTestCase {
     trigger.run(); // this run should detect the lost node
     trigger.close(); // close the old trigger
 
-    try (NodeLostTrigger newTrigger = new NodeLostTrigger("some_different_name", props, container, container.getZkController()))  {
+    try (NodeLostTrigger newTrigger = new NodeLostTrigger("some_different_name", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager()))  {
       try {
         newTrigger.restoreState(trigger);
         fail("Trigger should only be able to restore state from an old trigger of the same name");
@@ -294,7 +300,8 @@ public class NodeLostTriggerTest extends SolrCloudTestCase {
       }
     }
 
-    try (NodeLostTrigger newTrigger = new NodeLostTrigger("node_lost_trigger", props, container, container.getZkController())) {
+    try (NodeLostTrigger newTrigger = new NodeLostTrigger("node_lost_trigger", props, container.getResourceLoader(),
+        container.getZkController().getSolrCloudManager())) {
       AtomicBoolean fired = new AtomicBoolean(false);
       AtomicReference<TriggerEvent> eventRef = new AtomicReference<>();
       newTrigger.setProcessor(event -> {

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/autoscaling/TestPolicyCloud.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/autoscaling/TestPolicyCloud.java b/solr/core/src/test/org/apache/solr/cloud/autoscaling/TestPolicyCloud.java
index bd3d5fd..4136d27 100644
--- a/solr/core/src/test/org/apache/solr/cloud/autoscaling/TestPolicyCloud.java
+++ b/solr/core/src/test/org/apache/solr/cloud/autoscaling/TestPolicyCloud.java
@@ -28,13 +28,16 @@ import org.apache.lucene.util.Constants;
 import org.apache.lucene.util.LuceneTestCase;
 import org.apache.solr.client.solrj.SolrRequest;
 import org.apache.solr.client.solrj.SolrServerException;
+import org.apache.solr.client.solrj.cloud.DistributedQueueFactory;
+import org.apache.solr.client.solrj.cloud.autoscaling.SolrCloudManager;
 import org.apache.solr.client.solrj.embedded.JettySolrRunner;
 import org.apache.solr.client.solrj.impl.CloudSolrClient;
 import org.apache.solr.client.solrj.impl.HttpSolrClient;
-import org.apache.solr.client.solrj.impl.SolrClientDataProvider;
+import org.apache.solr.client.solrj.impl.SolrClientCloudManager;
 import org.apache.solr.client.solrj.request.CollectionAdminRequest;
 import org.apache.solr.cloud.OverseerTaskProcessor;
 import org.apache.solr.cloud.SolrCloudTestCase;
+import org.apache.solr.cloud.ZkDistributedQueueFactory;
 import org.apache.solr.common.cloud.DocCollection;
 import org.apache.solr.common.cloud.Replica;
 import org.apache.solr.common.cloud.ZkStateReader;
@@ -168,10 +171,11 @@ public class TestPolicyCloud extends SolrCloudTestCase {
     CollectionAdminRequest.createCollection("metricsTest", "conf", 1, 1)
         .process(cluster.getSolrClient());
     DocCollection collection = getCollectionState("metricsTest");
-    SolrClientDataProvider provider = new SolrClientDataProvider(solrClient);
+    DistributedQueueFactory queueFactory = new ZkDistributedQueueFactory(cluster.getZkClient());
+    SolrCloudManager provider = new SolrClientCloudManager(queueFactory, solrClient);
     List<String> tags = Arrays.asList("metrics:solr.node:ADMIN./admin/authorization.clientErrors:count",
         "metrics:solr.jvm:buffers.direct.Count");
-    Map<String, Object> val = provider.getNodeValues(collection .getReplicas().get(0).getNodeName(), tags);
+    Map<String, Object> val = provider.getNodeStateProvider().getNodeValues(collection .getReplicas().get(0).getNodeName(), tags);
     for (String tag : tags) {
       assertNotNull( "missing : "+ tag , val.get(tag));
     }
@@ -268,8 +272,9 @@ public class TestPolicyCloud extends SolrCloudTestCase {
     CollectionAdminRequest.createCollectionWithImplicitRouter("policiesTest", "conf", "shard1", 2)
         .process(cluster.getSolrClient());
     DocCollection rulesCollection = getCollectionState("policiesTest");
-    SolrClientDataProvider provider = new SolrClientDataProvider(cluster.getSolrClient());
-    Map<String, Object> val = provider.getNodeValues(rulesCollection.getReplicas().get(0).getNodeName(), Arrays.asList(
+
+    SolrCloudManager cloudManager = new SolrClientCloudManager(new ZkDistributedQueueFactory(cluster.getZkClient()), cluster.getSolrClient());
+    Map<String, Object> val = cloudManager.getNodeStateProvider().getNodeValues(rulesCollection.getReplicas().get(0).getNodeName(), Arrays.asList(
         "freedisk",
         "cores",
         "heapUsage",
@@ -293,7 +298,7 @@ public class TestPolicyCloud extends SolrCloudTestCase {
       }
       Thread.sleep(100);
     }
-    val = provider.getNodeValues(overseerNode, Arrays.asList(
+    val = cloudManager.getNodeStateProvider().getNodeValues(overseerNode, Arrays.asList(
         "nodeRole",
         "ip_1", "ip_2", "ip_3", "ip_4",
         "sysprop.java.version",

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/autoscaling/TriggerIntegrationTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/autoscaling/TriggerIntegrationTest.java b/solr/core/src/test/org/apache/solr/cloud/autoscaling/TriggerIntegrationTest.java
index 72127b2..0fc2830 100644
--- a/solr/core/src/test/org/apache/solr/cloud/autoscaling/TriggerIntegrationTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/autoscaling/TriggerIntegrationTest.java
@@ -34,6 +34,7 @@ import java.util.concurrent.locks.ReentrantLock;
 
 import org.apache.solr.client.solrj.SolrRequest;
 import org.apache.solr.client.solrj.cloud.autoscaling.AutoScalingConfig;
+import org.apache.solr.client.solrj.cloud.autoscaling.SolrCloudManager;
 import org.apache.solr.client.solrj.cloud.autoscaling.TriggerEventProcessorStage;
 import org.apache.solr.client.solrj.cloud.autoscaling.TriggerEventType;
 import org.apache.solr.client.solrj.embedded.JettySolrRunner;
@@ -46,7 +47,6 @@ import org.apache.solr.common.cloud.ZkNodeProps;
 import org.apache.solr.common.cloud.ZkStateReader;
 import org.apache.solr.common.util.NamedList;
 import org.apache.solr.common.util.Utils;
-import org.apache.solr.core.CoreContainer;
 import org.apache.solr.util.LogLevel;
 import org.apache.solr.util.TimeOut;
 import org.apache.solr.util.TimeSource;
@@ -966,8 +966,8 @@ public class TriggerIntegrationTest extends SolrCloudTestCase {
 
   public static class TestTriggerListener extends TriggerListenerBase {
     @Override
-    public void init(CoreContainer coreContainer, AutoScalingConfig.TriggerListenerConfig config) {
-      super.init(coreContainer, config);
+    public void init(SolrCloudManager dataProvider, AutoScalingConfig.TriggerListenerConfig config) {
+      super.init(dataProvider, config);
       listenerCreated.countDown();
     }
 

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/overseer/TestClusterStateMutator.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/overseer/TestClusterStateMutator.java b/solr/core/src/test/org/apache/solr/cloud/overseer/TestClusterStateMutator.java
index 18cf763..311e14d 100644
--- a/solr/core/src/test/org/apache/solr/cloud/overseer/TestClusterStateMutator.java
+++ b/solr/core/src/test/org/apache/solr/cloud/overseer/TestClusterStateMutator.java
@@ -19,7 +19,8 @@ package org.apache.solr.cloud.overseer;
 import java.util.Collections;
 
 import org.apache.solr.SolrTestCaseJ4;
-import org.apache.solr.cloud.MockZkStateReader;
+import org.apache.solr.client.solrj.cloud.autoscaling.DistribStateManager;
+import org.apache.solr.client.solrj.cloud.autoscaling.SolrCloudManager;
 import org.apache.solr.common.cloud.ClusterState;
 import org.apache.solr.common.cloud.DocCollection;
 import org.apache.solr.common.cloud.ImplicitDocRouter;
@@ -27,13 +28,16 @@ import org.apache.solr.common.cloud.Slice;
 import org.apache.solr.common.cloud.ZkNodeProps;
 import org.apache.solr.common.util.Utils;
 
+import static org.mockito.Mockito.*;
+
 public class TestClusterStateMutator extends SolrTestCaseJ4 {
   public void testCreateCollection() throws Exception {
-    ClusterState state = new ClusterState(-1, Collections.<String>emptySet(), Collections.<String, DocCollection>emptyMap());
-    MockZkStateReader zkStateReader = new MockZkStateReader(state, Collections.<String>emptySet());
+    ClusterState clusterState = new ClusterState(-1, Collections.<String>emptySet(), Collections.<String, DocCollection>emptyMap());
+    DistribStateManager mockStateManager = mock(DistribStateManager.class);
+    SolrCloudManager dataProvider = mock(SolrCloudManager.class);
+    when(dataProvider.getDistribStateManager()).thenReturn(mockStateManager);
 
-    ClusterState clusterState = zkStateReader.getClusterState();
-    ClusterStateMutator mutator = new ClusterStateMutator(zkStateReader);
+    ClusterStateMutator mutator = new ClusterStateMutator(dataProvider);
     ZkNodeProps message = new ZkNodeProps(Utils.makeMap(
         "name", "xyz",
         "numShards", "1"
@@ -44,7 +48,7 @@ public class TestClusterStateMutator extends SolrTestCaseJ4 {
     assertEquals(1, collection.getSlicesMap().size());
     assertEquals(1, collection.getMaxShardsPerNode());
 
-    state = new ClusterState(-1, Collections.<String>emptySet(), Collections.singletonMap("xyz", collection));
+    ClusterState state = new ClusterState(-1, Collections.<String>emptySet(), Collections.singletonMap("xyz", collection));
     message = new ZkNodeProps(Utils.makeMap(
         "name", "abc",
         "numShards", "2",

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/overseer/ZkStateReaderTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/overseer/ZkStateReaderTest.java b/solr/core/src/test/org/apache/solr/cloud/overseer/ZkStateReaderTest.java
index 167279d..228fc29 100644
--- a/solr/core/src/test/org/apache/solr/cloud/overseer/ZkStateReaderTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/overseer/ZkStateReaderTest.java
@@ -24,8 +24,8 @@ import java.util.concurrent.TimeUnit;
 import org.apache.lucene.util.IOUtils;
 import org.apache.solr.SolrTestCaseJ4;
 import org.apache.solr.cloud.AbstractZkTestCase;
-import org.apache.solr.cloud.Overseer;
 import org.apache.solr.cloud.OverseerTest;
+import org.apache.solr.cloud.Stats;
 import org.apache.solr.cloud.ZkController;
 import org.apache.solr.cloud.ZkTestServer;
 import org.apache.solr.common.cloud.ClusterState;
@@ -81,7 +81,7 @@ public class ZkStateReaderTest extends SolrTestCaseJ4 {
         reader.registerCore("c1");
       }
 
-      ZkStateWriter writer = new ZkStateWriter(reader, new Overseer.Stats());
+      ZkStateWriter writer = new ZkStateWriter(reader, new Stats());
 
       zkClient.makePath(ZkStateReader.COLLECTIONS_ZKNODE + "/c1", true);
 
@@ -154,7 +154,7 @@ public class ZkStateReaderTest extends SolrTestCaseJ4 {
       reader = new ZkStateReader(zkClient);
       reader.createClusterStateWatchersAndUpdate();
 
-      ZkStateWriter writer = new ZkStateWriter(reader, new Overseer.Stats());
+      ZkStateWriter writer = new ZkStateWriter(reader, new Stats());
 
       zkClient.makePath(ZkStateReader.COLLECTIONS_ZKNODE + "/c1", true);
 
@@ -206,7 +206,7 @@ public class ZkStateReaderTest extends SolrTestCaseJ4 {
       // Still no c1 collection, despite a collection path.
       assertNull(reader.getClusterState().getCollectionRef("c1"));
 
-      ZkStateWriter writer = new ZkStateWriter(reader, new Overseer.Stats());
+      ZkStateWriter writer = new ZkStateWriter(reader, new Stats());
 
 
       // create new collection with stateFormat = 2

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/core/src/test/org/apache/solr/cloud/overseer/ZkStateWriterTest.java
----------------------------------------------------------------------
diff --git a/solr/core/src/test/org/apache/solr/cloud/overseer/ZkStateWriterTest.java b/solr/core/src/test/org/apache/solr/cloud/overseer/ZkStateWriterTest.java
index bd31050..8ac17df 100644
--- a/solr/core/src/test/org/apache/solr/cloud/overseer/ZkStateWriterTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/overseer/ZkStateWriterTest.java
@@ -27,6 +27,7 @@ import org.apache.solr.SolrTestCaseJ4;
 import org.apache.solr.cloud.AbstractZkTestCase;
 import org.apache.solr.cloud.Overseer;
 import org.apache.solr.cloud.OverseerTest;
+import org.apache.solr.cloud.Stats;
 import org.apache.solr.cloud.ZkController;
 import org.apache.solr.cloud.ZkTestServer;
 import org.apache.solr.common.cloud.ClusterState;
@@ -87,7 +88,7 @@ public class ZkStateWriterTest extends SolrTestCaseJ4 {
             new DocCollection("c2", new HashMap<>(), new HashMap<>(), DocRouter.DEFAULT, 0, ZkStateReader.COLLECTIONS_ZKNODE + "/c2"));
         ZkWriteCommand c3 = new ZkWriteCommand("c3",
             new DocCollection("c3", new HashMap<>(), new HashMap<>(), DocRouter.DEFAULT, 0, ZkStateReader.COLLECTIONS_ZKNODE + "/c3"));
-        ZkStateWriter writer = new ZkStateWriter(reader, new Overseer.Stats());
+        ZkStateWriter writer = new ZkStateWriter(reader, new Stats());
 
         // First write is flushed immediately
         ClusterState clusterState = writer.enqueueUpdate(reader.getClusterState(), Collections.singletonList(c1), null);
@@ -129,7 +130,7 @@ public class ZkStateWriterTest extends SolrTestCaseJ4 {
       try (ZkStateReader reader = new ZkStateReader(zkClient)) {
         reader.createClusterStateWatchersAndUpdate();
 
-        ZkStateWriter writer = new ZkStateWriter(reader, new Overseer.Stats());
+        ZkStateWriter writer = new ZkStateWriter(reader, new Stats());
 
         zkClient.makePath(ZkStateReader.COLLECTIONS_ZKNODE + "/c1", true);
 
@@ -171,7 +172,7 @@ public class ZkStateWriterTest extends SolrTestCaseJ4 {
       try (ZkStateReader reader = new ZkStateReader(zkClient)) {
         reader.createClusterStateWatchersAndUpdate();
 
-        ZkStateWriter writer = new ZkStateWriter(reader, new Overseer.Stats());
+        ZkStateWriter writer = new ZkStateWriter(reader, new Stats());
 
         zkClient.makePath(ZkStateReader.COLLECTIONS_ZKNODE + "/c1", true);
 
@@ -215,7 +216,7 @@ public class ZkStateWriterTest extends SolrTestCaseJ4 {
       try (ZkStateReader reader = new ZkStateReader(zkClient)) {
         reader.createClusterStateWatchersAndUpdate();
 
-        ZkStateWriter writer = new ZkStateWriter(reader, new Overseer.Stats());
+        ZkStateWriter writer = new ZkStateWriter(reader, new Stats());
 
         zkClient.makePath(ZkStateReader.COLLECTIONS_ZKNODE + "/c1", true);
         zkClient.makePath(ZkStateReader.COLLECTIONS_ZKNODE + "/c2", true);
@@ -291,7 +292,7 @@ public class ZkStateWriterTest extends SolrTestCaseJ4 {
       try (ZkStateReader reader = new ZkStateReader(zkClient)) {
         reader.createClusterStateWatchersAndUpdate();
 
-        ZkStateWriter writer = new ZkStateWriter(reader, new Overseer.Stats());
+        ZkStateWriter writer = new ZkStateWriter(reader, new Stats());
 
         zkClient.makePath(ZkStateReader.COLLECTIONS_ZKNODE + "/c1", true);
         zkClient.makePath(ZkStateReader.COLLECTIONS_ZKNODE + "/c2", true);

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/DistributedQueue.java
----------------------------------------------------------------------
diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/DistributedQueue.java b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/DistributedQueue.java
new file mode 100644
index 0000000..9a31bff
--- /dev/null
+++ b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/DistributedQueue.java
@@ -0,0 +1,58 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.client.solrj.cloud;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.function.Predicate;
+
+import org.apache.solr.common.util.Pair;
+
+/**
+ * Distributed queue component. Methods largely follow those in {@link java.util.Queue}.
+ */
+public interface DistributedQueue {
+  byte[] peek() throws Exception;
+
+  byte[] peek(boolean block) throws Exception;
+
+  byte[] peek(long wait) throws Exception;
+
+  byte[] poll() throws Exception;
+
+  byte[] remove() throws Exception;
+
+  byte[] take() throws Exception;
+
+  void offer(byte[] data) throws Exception;
+
+  /**
+   * Retrieve statistics about the queue size, operations and their timings.
+   */
+  Map<String, Object> getStats();
+
+  /**
+   * Peek multiple elements from the queue in a single call.
+   * @param max maximum elements to retrieve
+   * @param waitMillis if less than maximum element is in the queue then wait at most this time for at least one new element.
+   * @param acceptFilter peek only elements that pass this filter
+   * @return peeked elements
+   * @throws Exception on errors
+   */
+  Collection<Pair<String, byte[]>> peekElements(int max, long waitMillis, Predicate<String> acceptFilter) throws Exception;
+
+}

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/DistributedQueueFactory.java
----------------------------------------------------------------------
diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/DistributedQueueFactory.java b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/DistributedQueueFactory.java
new file mode 100644
index 0000000..c54ccbd
--- /dev/null
+++ b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/DistributedQueueFactory.java
@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.client.solrj.cloud;
+
+import java.io.IOException;
+
+/**
+ *
+ */
+public interface DistributedQueueFactory {
+  DistributedQueue makeQueue(String path) throws IOException;
+
+  void removeQueue(String path) throws IOException;
+}

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/AlreadyExistsException.java
----------------------------------------------------------------------
diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/AlreadyExistsException.java b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/AlreadyExistsException.java
new file mode 100644
index 0000000..608b254
--- /dev/null
+++ b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/AlreadyExistsException.java
@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.client.solrj.cloud.autoscaling;
+
+/**
+ *
+ */
+public class AlreadyExistsException extends Exception {
+
+  private final String path;
+
+  public AlreadyExistsException(String path) {
+    super("Path already exists: " + path);
+    this.path = path;
+  }
+
+  public String getPath() {
+    return path;
+  }
+
+}

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/AutoScalingConfig.java
----------------------------------------------------------------------
diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/AutoScalingConfig.java b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/AutoScalingConfig.java
index 51e8f42..5312c29 100644
--- a/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/AutoScalingConfig.java
+++ b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/AutoScalingConfig.java
@@ -495,6 +495,10 @@ public class AutoScalingConfig implements MapWriter {
     ew.put("listeners", getTriggerListenerConfigs());
   }
 
+  public String toString() {
+    return Utils.toJSONString(this);
+  }
+
   @Override
   public boolean equals(Object o) {
     if (this == o) return true;
@@ -503,8 +507,8 @@ public class AutoScalingConfig implements MapWriter {
     AutoScalingConfig that = (AutoScalingConfig) o;
 
     if (!getPolicy().equals(that.getPolicy())) return false;
-    if (!triggers.equals(that.triggers)) return false;
-    return listeners.equals(that.listeners);
+    if (!getTriggerConfigs().equals(that.getTriggerConfigs())) return false;
+    return getTriggerListenerConfigs().equals(that.getTriggerListenerConfigs());
   }
 
   private static List<Object> getList(String key, Map<String, Object> properties) {

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/BadVersionException.java
----------------------------------------------------------------------
diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/BadVersionException.java b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/BadVersionException.java
new file mode 100644
index 0000000..757d979
--- /dev/null
+++ b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/BadVersionException.java
@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.client.solrj.cloud.autoscaling;
+
+/**
+ *
+ */
+public class BadVersionException extends Exception {
+
+  private final String path;
+  private final int requested;
+
+  public BadVersionException(int requested, String path) {
+    super(path);
+    this.path = path;
+    this.requested = requested;
+  }
+
+  public String getPath() {
+    return path;
+  }
+
+  public int getRequested() {
+    return requested;
+  }
+}

http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/11e208e4/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/ClusterDataProvider.java
----------------------------------------------------------------------
diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/ClusterDataProvider.java b/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/ClusterDataProvider.java
deleted file mode 100644
index 58972af..0000000
--- a/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/ClusterDataProvider.java
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.solr.client.solrj.cloud.autoscaling;
-
-import java.io.Closeable;
-import java.io.IOException;
-import java.util.Collection;
-import java.util.List;
-import java.util.Map;
-
-public interface ClusterDataProvider extends Closeable {
-  /**Get the value of each tag for a given node
-   *
-   * @param node node name
-   * @param tags tag names
-   * @return a map of tag vs value
-   */
-  Map<String, Object> getNodeValues(String node, Collection<String> tags);
-
-  /**
-   * Get the details of each replica in a node. It attempts to fetch as much details about
-   * the replica as mentioned in the keys list. It is not necessary to give al details
-   * <p>
-   * the format is {collection:shard :[{replicadetails}]}
-   */
-  Map<String, Map<String, List<ReplicaInfo>>> getReplicaInfo(String node, Collection<String> keys);
-
-  Collection<String> getNodes();
-
-  /**Get the collection-specific policy
-   */
-  String getPolicyNameByCollection(String coll);
-
-  @Override
-  default void close() throws IOException {
-  }
-}


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