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Subject [GitHub] [hbase] saintstack commented on a change in pull request #1746: HBASE-24388 Introduce a 'local root region' at master side to store t…
Date Wed, 20 May 2020 19:04:16 GMT

saintstack commented on a change in pull request #1746:
URL: https://github.com/apache/hbase/pull/1746#discussion_r428196462



##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
##########
@@ -866,6 +877,50 @@ protected AssignmentManager createAssignmentManager(MasterServices master)
{
     return new AssignmentManager(master);
   }
 
+  private void createRootTable() throws IOException, KeeperException {
+    RootTable rootTable = new RootTable(this, cleanerPool);
+    rootTable.initialize();
+    // try migrate data from zookeeper
+    try (RegionScanner scanner =
+      rootTable.getScanner(new Scan().addFamily(HConstants.CATALOG_FAMILY))) {
+      List<Cell> cells = new ArrayList<>();
+      boolean moreRows = scanner.next(cells);
+      if (!cells.isEmpty() || moreRows) {
+        // notice that all replicas for a region are in the same row, so the migration can
be
+        // done with in a one row put, which means if we have data in root table then we
can make
+        // sure that the migration is done.

Review comment:
       Good

##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
##########
@@ -866,6 +877,50 @@ protected AssignmentManager createAssignmentManager(MasterServices master)
{
     return new AssignmentManager(master);
   }
 
+  private void createRootTable() throws IOException, KeeperException {

Review comment:
       Would be cool if this was not inline in HMaster class. It too big as it is.

##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
##########
@@ -866,6 +877,50 @@ protected AssignmentManager createAssignmentManager(MasterServices master)
{
     return new AssignmentManager(master);
   }
 
+  private void createRootTable() throws IOException, KeeperException {
+    RootTable rootTable = new RootTable(this, cleanerPool);
+    rootTable.initialize();
+    // try migrate data from zookeeper
+    try (RegionScanner scanner =
+      rootTable.getScanner(new Scan().addFamily(HConstants.CATALOG_FAMILY))) {
+      List<Cell> cells = new ArrayList<>();
+      boolean moreRows = scanner.next(cells);
+      if (!cells.isEmpty() || moreRows) {
+        // notice that all replicas for a region are in the same row, so the migration can
be
+        // done with in a one row put, which means if we have data in root table then we
can make
+        // sure that the migration is done.
+        LOG.info("Root table already has data in it, skip migrating...");
+        this.rootTable = rootTable;
+        return;
+      }
+    }
+    // start migrating
+    byte[] row = MetaTableAccessor.getMetaKeyForRegion(RegionInfoBuilder.FIRST_META_REGIONINFO);
+    Put put = new Put(row);
+    List<String> metaReplicaNodes = zooKeeper.getMetaReplicaNodes();
+    StringBuilder info = new StringBuilder("Migrating meta location:");
+    for (String metaReplicaNode : metaReplicaNodes) {
+      int replicaId = zooKeeper.getZNodePaths().getMetaReplicaIdFromZnode(metaReplicaNode);
+      RegionState state = MetaTableLocator.getMetaRegionState(zooKeeper, replicaId);
+      info.append(" ").append(state);
+      put.setTimestamp(state.getStamp());
+      MetaTableAccessor.addRegionInfo(put, state.getRegion());
+      if (state.getServerName() != null) {
+        MetaTableAccessor.addLocation(put, state.getServerName(), HConstants.NO_SEQNUM, replicaId);
+      }
+      put.add(CellBuilderFactory.create(CellBuilderType.SHALLOW_COPY).setRow(put.getRow())
+        .setFamily(HConstants.CATALOG_FAMILY)
+        .setQualifier(RegionStateStore.getStateColumn(replicaId)).setTimestamp(put.getTimestamp())
+        .setType(Cell.Type.Put).setValue(Bytes.toBytes(state.getState().name())).build());
+    }
+    if (!put.isEmpty()) {
+      LOG.info(info.toString());
+    } else {
+      LOG.info("No meta location avaiable on zookeeper, skip migrating...");
+    }
+    this.rootTable = rootTable;
+  }
+

Review comment:
       good

##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/region/LocalRegion.java
##########
@@ -0,0 +1,328 @@
+/**
+ * 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.hadoop.hbase.region;
+
+import static org.apache.hadoop.hbase.HConstants.HREGION_LOGDIR_NAME;
+
+import java.io.IOException;
+import java.util.Collections;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hbase.HBaseIOException;
+import org.apache.hadoop.hbase.Server;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.Get;
+import org.apache.hadoop.hbase.client.RegionInfo;
+import org.apache.hadoop.hbase.client.RegionInfoBuilder;
+import org.apache.hadoop.hbase.client.Result;
+import org.apache.hadoop.hbase.client.Scan;
+import org.apache.hadoop.hbase.client.TableDescriptor;
+import org.apache.hadoop.hbase.master.HMaster;
+import org.apache.hadoop.hbase.master.cleaner.HFileCleaner;
+import org.apache.hadoop.hbase.regionserver.HRegion;
+import org.apache.hadoop.hbase.regionserver.HRegion.FlushResult;
+import org.apache.hadoop.hbase.regionserver.HRegionFileSystem;
+import org.apache.hadoop.hbase.regionserver.RegionScanner;
+import org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.hbase.util.CommonFSUtils;
+import org.apache.hadoop.hbase.util.HFileArchiveUtil;
+import org.apache.hadoop.hbase.util.RecoverLeaseFSUtils;
+import org.apache.hadoop.hbase.wal.AbstractFSWALProvider;
+import org.apache.hadoop.hbase.wal.WAL;
+import org.apache.hadoop.hbase.wal.WALFactory;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
+import org.apache.hbase.thirdparty.com.google.common.math.IntMath;
+
+/**
+ * A region that stores data in a separated directory on WAL file system.

Review comment:
       We still need to do this snowflaking?

##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
##########
@@ -866,6 +877,50 @@ protected AssignmentManager createAssignmentManager(MasterServices master)
{
     return new AssignmentManager(master);
   }
 
+  private void createRootTable() throws IOException, KeeperException {
+    RootTable rootTable = new RootTable(this, cleanerPool);
+    rootTable.initialize();
+    // try migrate data from zookeeper
+    try (RegionScanner scanner =
+      rootTable.getScanner(new Scan().addFamily(HConstants.CATALOG_FAMILY))) {
+      List<Cell> cells = new ArrayList<>();
+      boolean moreRows = scanner.next(cells);
+      if (!cells.isEmpty() || moreRows) {
+        // notice that all replicas for a region are in the same row, so the migration can
be
+        // done with in a one row put, which means if we have data in root table then we
can make
+        // sure that the migration is done.
+        LOG.info("Root table already has data in it, skip migrating...");
+        this.rootTable = rootTable;
+        return;
+      }
+    }
+    // start migrating
+    byte[] row = MetaTableAccessor.getMetaKeyForRegion(RegionInfoBuilder.FIRST_META_REGIONINFO);

Review comment:
       So, this row key is just serialized meta region name?

##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterServices.java
##########
@@ -552,4 +553,6 @@ default SplitWALManager getSplitWALManager(){
    * @return The state of the load balancer, or false if the load balancer isn't defined.
    */
   boolean isBalancerOn();
+
+  RootTable getRootTable();

Review comment:
       It can't be kept totally internal?

##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterServices.java
##########
@@ -552,4 +553,6 @@ default SplitWALManager getSplitWALManager(){
    * @return The state of the load balancer, or false if the load balancer isn't defined.
    */
   boolean isBalancerOn();
+
+  RootTable getRootTable();

Review comment:
       I suppose AM gets it this way or some other internal services?

##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/root/RootTable.java
##########
@@ -0,0 +1,148 @@
+/**
+ * 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.hadoop.hbase.master.root;
+
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.Server;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
+import org.apache.hadoop.hbase.client.Delete;
+import org.apache.hadoop.hbase.client.Put;
+import org.apache.hadoop.hbase.client.Scan;
+import org.apache.hadoop.hbase.client.TableDescriptor;
+import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
+import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
+import org.apache.hadoop.hbase.master.cleaner.DirScanPool;
+import org.apache.hadoop.hbase.master.procedure.MasterProcedureUtil;
+import org.apache.hadoop.hbase.region.LocalRegion;
+import org.apache.hadoop.hbase.region.LocalRegionParams;
+import org.apache.hadoop.hbase.regionserver.BloomType;
+import org.apache.hadoop.hbase.regionserver.RegionScanner;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Used to store the location of meta region.
+ */
+@InterfaceAudience.Private
+public class RootTable {
+
+  private static final Logger LOG = LoggerFactory.getLogger(RootTable.class);
+
+  static final String MAX_WALS_KEY = "hbase.root.table.region.maxwals";
+
+  private static final int DEFAULT_MAX_WALS = 10;
+
+  static final String USE_HSYNC_KEY = "hbase.root.table.region.wal.hsync";
+
+  static final String RING_BUFFER_SLOT_COUNT = "hbase.root.table.region.maxwals";
+
+  private static final int DEFAULT_RING_BUFFER_SLOT_COUNT = 64;
+
+  static final String ROOT_TABLE_DIR = "RootTable";
+
+  static final String HFILECLEANER_PLUGINS = "hbase.root.table.region.hfilecleaner.plugins";
+
+  static final String FLUSH_SIZE_KEY = "hbase.root.table.region.flush.size";
+
+  static final long DEFAULT_FLUSH_SIZE = TableDescriptorBuilder.DEFAULT_MEMSTORE_FLUSH_SIZE;
+
+  static final String FLUSH_PER_CHANGES_KEY = "hbase.root.table.region.flush.per.changes";
+
+  private static final long DEFAULT_FLUSH_PER_CHANGES = 1_000_000;
+
+  static final String FLUSH_INTERVAL_MS_KEY = "hbase.root.table.region.flush.interval.ms";
+
+  // default to flush every 15 minutes, for safety
+  private static final long DEFAULT_FLUSH_INTERVAL_MS = TimeUnit.MINUTES.toMillis(15);
+
+  static final String COMPACT_MIN_KEY = "hbase.root.table.region.compact.min";
+
+  private static final int DEFAULT_COMPACT_MIN = 4;
+
+  static final String ROLL_PERIOD_MS_KEY = "hbase.root.table.region.walroll.period.ms";
+
+  private static final long DEFAULT_ROLL_PERIOD_MS = TimeUnit.MINUTES.toMillis(15);
+
+  static final TableName TABLE_NAME = TableName.valueOf("master:root");
+
+  private static final TableDescriptor TABLE_DESC = TableDescriptorBuilder.newBuilder(TABLE_NAME)
+    .setColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(HConstants.CATALOG_FAMILY)
+      .setMaxVersions(HConstants.DEFAULT_HBASE_META_VERSIONS).setInMemory(true)
+      .setBlocksize(HConstants.DEFAULT_HBASE_META_BLOCK_SIZE).setBloomFilterType(BloomType.ROWCOL)
+      .setDataBlockEncoding(DataBlockEncoding.ROW_INDEX_V1).build())
+    .build();
+
+  private final Server server;
+
+  private final DirScanPool cleanerPool;
+
+  private LocalRegion region;
+
+  public RootTable(Server server, DirScanPool cleanerPool) {
+    this.server = server;
+    this.cleanerPool = cleanerPool;
+  }
+
+  public void initialize() throws IOException {
+    LOG.info("Initializing root table...");
+    LocalRegionParams params = new LocalRegionParams().server(server).regionDirName(ROOT_TABLE_DIR)

Review comment:
       Is this at ${root.dir}/RootTable?

##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStateStore.java
##########
@@ -216,12 +196,32 @@ private void updateUserRegionLocation(RegionInfo regionInfo, State state,
         .build());
     LOG.info(info.toString());
     updateRegionLocation(regionInfo, state, put);
+    if (regionInfo.isMetaRegion() && regionInfo.isFirst()) {
+      // mirror the meta location to
+      mirrorMetaLocation(regionInfo, regionLocation, state);
+    }
   }
 
-  private void updateRegionLocation(RegionInfo regionInfo, State state, Put put)
+  public void mirrorMetaLocation(RegionInfo regionInfo, ServerName serverName, State state)
       throws IOException {
-    try (Table table = master.getConnection().getTable(TableName.META_TABLE_NAME)) {
-      table.put(put);
+    try {
+      MetaTableLocator.setMetaLocation(master.getZooKeeper(), serverName, regionInfo.getReplicaId(),
+        state);
+    } catch (KeeperException e) {
+      throw new IOException(e);
+    }
+  }
+
+  private void updateRegionLocation(RegionInfo regionInfo, State state, Put put)
+    throws IOException {
+    try {
+      if (regionInfo.isMetaRegion()) {
+        master.getRootTable().update(put);

Review comment:
       Nice

##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/root/RootTable.java
##########
@@ -0,0 +1,148 @@
+/**
+ * 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.hadoop.hbase.master.root;
+
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.Server;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
+import org.apache.hadoop.hbase.client.Delete;
+import org.apache.hadoop.hbase.client.Put;
+import org.apache.hadoop.hbase.client.Scan;
+import org.apache.hadoop.hbase.client.TableDescriptor;
+import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
+import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
+import org.apache.hadoop.hbase.master.cleaner.DirScanPool;
+import org.apache.hadoop.hbase.master.procedure.MasterProcedureUtil;
+import org.apache.hadoop.hbase.region.LocalRegion;
+import org.apache.hadoop.hbase.region.LocalRegionParams;
+import org.apache.hadoop.hbase.regionserver.BloomType;
+import org.apache.hadoop.hbase.regionserver.RegionScanner;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Used to store the location of meta region.
+ */
+@InterfaceAudience.Private
+public class RootTable {
+
+  private static final Logger LOG = LoggerFactory.getLogger(RootTable.class);
+
+  static final String MAX_WALS_KEY = "hbase.root.table.region.maxwals";
+
+  private static final int DEFAULT_MAX_WALS = 10;
+
+  static final String USE_HSYNC_KEY = "hbase.root.table.region.wal.hsync";
+
+  static final String RING_BUFFER_SLOT_COUNT = "hbase.root.table.region.maxwals";
+
+  private static final int DEFAULT_RING_BUFFER_SLOT_COUNT = 64;
+
+  static final String ROOT_TABLE_DIR = "RootTable";
+
+  static final String HFILECLEANER_PLUGINS = "hbase.root.table.region.hfilecleaner.plugins";
+
+  static final String FLUSH_SIZE_KEY = "hbase.root.table.region.flush.size";
+
+  static final long DEFAULT_FLUSH_SIZE = TableDescriptorBuilder.DEFAULT_MEMSTORE_FLUSH_SIZE;
+
+  static final String FLUSH_PER_CHANGES_KEY = "hbase.root.table.region.flush.per.changes";
+
+  private static final long DEFAULT_FLUSH_PER_CHANGES = 1_000_000;
+
+  static final String FLUSH_INTERVAL_MS_KEY = "hbase.root.table.region.flush.interval.ms";
+
+  // default to flush every 15 minutes, for safety
+  private static final long DEFAULT_FLUSH_INTERVAL_MS = TimeUnit.MINUTES.toMillis(15);
+
+  static final String COMPACT_MIN_KEY = "hbase.root.table.region.compact.min";
+
+  private static final int DEFAULT_COMPACT_MIN = 4;
+
+  static final String ROLL_PERIOD_MS_KEY = "hbase.root.table.region.walroll.period.ms";
+
+  private static final long DEFAULT_ROLL_PERIOD_MS = TimeUnit.MINUTES.toMillis(15);
+
+  static final TableName TABLE_NAME = TableName.valueOf("master:root");
+
+  private static final TableDescriptor TABLE_DESC = TableDescriptorBuilder.newBuilder(TABLE_NAME)
+    .setColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(HConstants.CATALOG_FAMILY)
+      .setMaxVersions(HConstants.DEFAULT_HBASE_META_VERSIONS).setInMemory(true)
+      .setBlocksize(HConstants.DEFAULT_HBASE_META_BLOCK_SIZE).setBloomFilterType(BloomType.ROWCOL)
+      .setDataBlockEncoding(DataBlockEncoding.ROW_INDEX_V1).build())
+    .build();
+
+  private final Server server;
+
+  private final DirScanPool cleanerPool;
+
+  private LocalRegion region;
+
+  public RootTable(Server server, DirScanPool cleanerPool) {
+    this.server = server;
+    this.cleanerPool = cleanerPool;
+  }
+
+  public void initialize() throws IOException {
+    LOG.info("Initializing root table...");
+    LocalRegionParams params = new LocalRegionParams().server(server).regionDirName(ROOT_TABLE_DIR)
+      .tableDescriptor(TABLE_DESC);
+    Configuration conf = server.getConfiguration();
+    long flushSize = conf.getLong(FLUSH_SIZE_KEY, DEFAULT_FLUSH_SIZE);
+    long flushPerChanges = conf.getLong(FLUSH_PER_CHANGES_KEY, DEFAULT_FLUSH_PER_CHANGES);
+    long flushIntervalMs = conf.getLong(FLUSH_INTERVAL_MS_KEY, DEFAULT_FLUSH_INTERVAL_MS);
+    int compactMin = conf.getInt(COMPACT_MIN_KEY, DEFAULT_COMPACT_MIN);
+    params.flushSize(flushSize).flushPerChanges(flushPerChanges).flushIntervalMs(flushIntervalMs)
+      .compactMin(compactMin);
+    int maxWals = conf.getInt(MAX_WALS_KEY, DEFAULT_MAX_WALS);
+    params.maxWals(maxWals);
+    if (conf.get(USE_HSYNC_KEY) != null) {
+      params.useHsync(conf.getBoolean(USE_HSYNC_KEY, false));
+    }
+    params.ringBufferSlotCount(conf.getInt(RING_BUFFER_SLOT_COUNT, DEFAULT_RING_BUFFER_SLOT_COUNT));
+    long rollPeriodMs = conf.getLong(ROLL_PERIOD_MS_KEY, DEFAULT_ROLL_PERIOD_MS);
+    params.rollPeriodMs(rollPeriodMs)
+      .archivedWalSuffix(MasterProcedureUtil.ARCHIVED_PROC_WAL_SUFFIX)
+      .hfileCleanerPlugins(HFILECLEANER_PLUGINS).cleanerPool(cleanerPool);
+    region = LocalRegion.create(params);
+  }
+
+  public void update(Put put) throws IOException {
+    region.update(r -> r.put(put));
+  }
+
+  public void delete(Delete delete) throws IOException {
+    region.update(r -> r.delete(delete));
+  }
+
+  public RegionScanner getScanner(Scan scan) throws IOException {
+    return region.getScanner(scan);
+  }
+
+  public void close(boolean abort) {
+    LOG.info("Closing root table, isAbort={}", abort);
+    if (region != null) {
+      region.close(abort);
+    }
+  }
+}

Review comment:
       It'd have its own Region?
   
   Seems overkill having a full Region just for meta locations?




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