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From t...@apache.org
Subject svn commit: r1310905 - in /hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs: ./ src/main/java/ src/main/java/org/apache/hadoop/hdfs/protocol/ src/main/java/org/apache/hadoop/hdfs/protocolPB/ src/main/java/org/apache/hadoop/hdfs/server/j...
Date Sat, 07 Apr 2012 22:53:59 GMT
Author: todd
Date: Sat Apr  7 22:53:55 2012
New Revision: 1310905

URL: http://svn.apache.org/viewvc?rev=1310905&view=rev
Log:
Merge trunk into auto-failover branch

Added:
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/FenceResponse.java
      - copied unchanged from r1310901, hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/FenceResponse.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/FencedException.java
      - copied unchanged from r1310901, hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/FencedException.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalInfo.java
      - copied unchanged from r1310901, hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalInfo.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsDefaultValue.java
      - copied unchanged from r1310901, hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsDefaultValue.java
Modified:
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/   (props changed)
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/pom.xml
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/   (props changed)
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/UnregisteredNodeException.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/JournalProtocolServerSideTranslatorPB.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/JournalProtocolTranslatorPB.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelper.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/journalservice/JournalService.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupJournalManager.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupNode.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/EditLogBackupOutputStream.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalProtocol.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/GetConf.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/   (props changed)
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.c
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.h
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs_test.c
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/tests/test-libhdfs.sh
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/JournalProtocol.proto
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/datanode/   (props changed)
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/   (props changed)
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/secondary/   (props changed)
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/hdfs/   (props changed)
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsFileStatusHdfs.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/journalservice/TestJournalService.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestGetConf.java

Propchange: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/
------------------------------------------------------------------------------
  Merged /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs:r1310174-1310901

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt Sat Apr  7 22:53:55 2012
@@ -62,14 +62,14 @@ Trunk (unreleased changes)
     HDFS-3178. Add states and state handler for journal synchronization in
     JournalService.  (szetszwo)
 
-    HDFS-3204. Minor modification to JournalProtocol.proto to make
-    it generic. (suresh)
-
   OPTIMIZATIONS
 
     HDFS-2834. Add a ByteBuffer-based read API to DFSInputStream.
     (Henry Robinson via todd)
 
+    HDFS-3110. Use directRead API to reduce the number of buffer copies in
+    libhdfs (Henry Robinson via todd)
+
   BUG FIXES
 
     HDFS-2299. TestOfflineEditsViewer is failing on trunk. (Uma Maheswara Rao G
@@ -114,6 +114,9 @@ Trunk (unreleased changes)
 
     HDFS-3126. Journal stream from Namenode to BackupNode needs to have 
     timeout. (Hari Mankude via suresh)
+
+    HDFS-3121. Add HDFS tests for HADOOP-8014 change. (John George via
+    suresh)
     
 Release 2.0.0 - UNRELEASED 
 
@@ -327,6 +330,17 @@ Release 2.0.0 - UNRELEASED 
     HDFS-3050. rework OEV to share more code with the NameNode.
     (Colin Patrick McCabe via eli)
 
+    HDFS-3226. Allow GetConf tool to print arbitrary keys (todd)
+
+    HDFS-3204. Minor modification to JournalProtocol.proto to make
+    it generic. (suresh)
+
+    HDFS-2505. Add a test to verify getFileChecksum(..) with ViewFS.  (Ravi
+    Prakash via szetszwo)
+
+    HDFS-3211. Add fence(..) and replace NamenodeRegistration with JournalInfo
+    and epoch in JournalProtocol. (suresh via szetszwo)
+
   OPTIMIZATIONS
 
     HDFS-3024. Improve performance of stringification in addStoredBlock (todd)
@@ -436,6 +450,9 @@ Release 2.0.0 - UNRELEASED 
     HDFS-3208. Bogus entries in hosts files are incorrectly displayed
     in the report. (eli)
 
+    HDFS-3136. Remove SLF4J dependency as HDFS does not need it to fix
+    unnecessary warnings. (Jason Lowe via suresh)
+
   BREAKDOWN OF HDFS-1623 SUBTASKS
 
     HDFS-2179. Add fencing framework and mechanisms for NameNode HA. (todd)

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/pom.xml
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/pom.xml?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/pom.xml (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/pom.xml Sat Apr  7 22:53:55 2012
@@ -91,16 +91,6 @@
       <scope>test</scope>
     </dependency>
     <dependency>
-      <groupId>org.slf4j</groupId>
-      <artifactId>slf4j-api</artifactId>
-      <scope>compile</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.slf4j</groupId>
-      <artifactId>slf4j-log4j12</artifactId>
-      <scope>compile</scope>
-    </dependency>
-    <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-all</artifactId>
       <scope>test</scope>

Propchange: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/
------------------------------------------------------------------------------
  Merged /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java:r1310174-1310901

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/UnregisteredNodeException.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/UnregisteredNodeException.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/UnregisteredNodeException.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/UnregisteredNodeException.java Sat Apr  7 22:53:55 2012
@@ -22,6 +22,7 @@ import java.io.IOException;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
 import org.apache.hadoop.hdfs.server.protocol.NodeRegistration;
 
 /**
@@ -33,6 +34,10 @@ import org.apache.hadoop.hdfs.server.pro
 public class UnregisteredNodeException extends IOException {
   private static final long serialVersionUID = -5620209396945970810L;
 
+  public UnregisteredNodeException(JournalInfo info) {
+    super("Unregistered server: " + info.toString());
+  }
+  
   public UnregisteredNodeException(NodeRegistration nodeReg) {
     super("Unregistered server: " + nodeReg.toString());
   }

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/JournalProtocolServerSideTranslatorPB.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/JournalProtocolServerSideTranslatorPB.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/JournalProtocolServerSideTranslatorPB.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/JournalProtocolServerSideTranslatorPB.java Sat Apr  7 22:53:55 2012
@@ -20,10 +20,13 @@ package org.apache.hadoop.hdfs.protocolP
 import java.io.IOException;
 
 import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.FenceRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.FenceResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.JournalRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.JournalResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.StartLogSegmentRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.StartLogSegmentResponseProto;
+import org.apache.hadoop.hdfs.server.protocol.FenceResponse;
 import org.apache.hadoop.hdfs.server.protocol.JournalProtocol;
 
 import com.google.protobuf.RpcController;
@@ -48,9 +51,8 @@ public class JournalProtocolServerSideTr
   public JournalResponseProto journal(RpcController unused,
       JournalRequestProto req) throws ServiceException {
     try {
-      impl.journal(PBHelper.convert(req.getJournalInfo()),
-          req.getFirstTxnId(), req.getNumTxns(), req.getRecords()
-              .toByteArray());
+      impl.journal(PBHelper.convert(req.getJournalInfo()), req.getEpoch(),
+          req.getFirstTxnId(), req.getNumTxns(), req.getRecords().toByteArray());
     } catch (IOException e) {
       throw new ServiceException(e);
     }
@@ -63,10 +65,24 @@ public class JournalProtocolServerSideTr
       StartLogSegmentRequestProto req) throws ServiceException {
     try {
       impl.startLogSegment(PBHelper.convert(req.getJournalInfo()),
-          req.getTxid());
+          req.getEpoch(), req.getTxid());
     } catch (IOException e) {
       throw new ServiceException(e);
     }
     return StartLogSegmentResponseProto.newBuilder().build();
   }
+
+  @Override
+  public FenceResponseProto fence(RpcController controller,
+      FenceRequestProto req) throws ServiceException {
+    try {
+      FenceResponse resp = impl.fence(PBHelper.convert(req.getJournalInfo()), req.getEpoch(),
+          req.getFencerInfo());
+      return FenceResponseProto.newBuilder().setInSync(resp.isInSync())
+          .setLastTransactionId(resp.getLastTransactionId())
+          .setPreviousEpoch(resp.getPreviousEpoch()).build();
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+  }
 }

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/JournalProtocolTranslatorPB.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/JournalProtocolTranslatorPB.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/JournalProtocolTranslatorPB.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/JournalProtocolTranslatorPB.java Sat Apr  7 22:53:55 2012
@@ -22,10 +22,13 @@ import java.io.IOException;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.FenceRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.FenceResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.JournalRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.StartLogSegmentRequestProto;
+import org.apache.hadoop.hdfs.server.protocol.FenceResponse;
+import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
 import org.apache.hadoop.hdfs.server.protocol.JournalProtocol;
-import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
 import org.apache.hadoop.ipc.ProtobufHelper;
 import org.apache.hadoop.ipc.ProtocolMetaInterface;
 import org.apache.hadoop.ipc.RPC;
@@ -58,10 +61,11 @@ public class JournalProtocolTranslatorPB
   }
 
   @Override
-  public void journal(NamenodeRegistration reg, long firstTxnId,
+  public void journal(JournalInfo journalInfo, long epoch, long firstTxnId,
       int numTxns, byte[] records) throws IOException {
     JournalRequestProto req = JournalRequestProto.newBuilder()
-        .setJournalInfo(PBHelper.convertToJournalInfo(reg))
+        .setJournalInfo(PBHelper.convert(journalInfo))
+        .setEpoch(epoch)
         .setFirstTxnId(firstTxnId)
         .setNumTxns(numTxns)
         .setRecords(PBHelper.getByteString(records))
@@ -74,10 +78,11 @@ public class JournalProtocolTranslatorPB
   }
 
   @Override
-  public void startLogSegment(NamenodeRegistration registration, long txid)
+  public void startLogSegment(JournalInfo journalInfo, long epoch, long txid)
       throws IOException {
     StartLogSegmentRequestProto req = StartLogSegmentRequestProto.newBuilder()
-        .setJournalInfo(PBHelper.convertToJournalInfo(registration))
+        .setJournalInfo(PBHelper.convert(journalInfo))
+        .setEpoch(epoch)
         .setTxid(txid)
         .build();
     try {
@@ -86,6 +91,20 @@ public class JournalProtocolTranslatorPB
       throw ProtobufHelper.getRemoteException(e);
     }
   }
+  
+  @Override
+  public FenceResponse fence(JournalInfo journalInfo, long epoch,
+      String fencerInfo) throws IOException {
+    FenceRequestProto req = FenceRequestProto.newBuilder().setEpoch(epoch)
+        .setJournalInfo(PBHelper.convert(journalInfo)).build();
+    try {
+      FenceResponseProto resp = rpcProxy.fence(NULL_CONTROLLER, req);
+      return new FenceResponse(resp.getPreviousEpoch(),
+          resp.getLastTransactionId(), resp.getInSync());
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
 
   @Override
   public boolean isMethodSupported(String methodName) throws IOException {

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelper.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelper.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelper.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelper.java Sat Apr  7 22:53:55 2012
@@ -110,6 +110,7 @@ import org.apache.hadoop.hdfs.server.pro
 import org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand;
 import org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand.RecoveringBlock;
 import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
+import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations.BlockWithLocations;
 import org.apache.hadoop.hdfs.server.protocol.CheckpointCommand;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol;
@@ -117,6 +118,7 @@ import org.apache.hadoop.hdfs.server.pro
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage.State;
 import org.apache.hadoop.hdfs.server.protocol.FinalizeCommand;
+import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
 import org.apache.hadoop.hdfs.server.protocol.KeyUpdateCommand;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeCommand;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
@@ -127,7 +129,6 @@ import org.apache.hadoop.hdfs.server.pro
 import org.apache.hadoop.hdfs.server.protocol.RegisterCommand;
 import org.apache.hadoop.hdfs.server.protocol.RemoteEditLog;
 import org.apache.hadoop.hdfs.server.protocol.RemoteEditLogManifest;
-import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations.BlockWithLocations;
 import org.apache.hadoop.hdfs.server.protocol.UpgradeCommand;
 import org.apache.hadoop.io.EnumSetWritable;
 import org.apache.hadoop.io.Text;
@@ -1347,25 +1348,19 @@ public class PBHelper {
         .setStorageID(r.getStorageID()).build();
   }
 
-  public static NamenodeRegistration convert(JournalInfoProto info) {
+  public static JournalInfo convert(JournalInfoProto info) {
     int lv = info.hasLayoutVersion() ? info.getLayoutVersion() : 0;
     int nsID = info.hasNamespaceID() ? info.getNamespaceID() : 0;
-    StorageInfo storage = new StorageInfo(lv, nsID, info.getClusterID(), 0);
-    
-    // Note that the role is always {@link NamenodeRole#NAMENODE} as this
-    // conversion happens for messages from Namenode to Journal receivers.
-    // Addresses in the registration are unused.
-    return new NamenodeRegistration("", "", storage, NamenodeRole.NAMENODE);
+    return new JournalInfo(lv, info.getClusterID(), nsID);
   }
 
   /**
    * Method used for converting {@link JournalInfoProto} sent from Namenode
    * to Journal receivers to {@link NamenodeRegistration}.
    */
-  public static JournalInfoProto convertToJournalInfo(
-      NamenodeRegistration reg) {
-    return JournalInfoProto.newBuilder().setClusterID(reg.getClusterID())
-        .setLayoutVersion(reg.getLayoutVersion())
-        .setNamespaceID(reg.getNamespaceID()).build();
+  public static JournalInfoProto convert(JournalInfo j) {
+    return JournalInfoProto.newBuilder().setClusterID(j.getClusterId())
+        .setLayoutVersion(j.getLayoutVersion())
+        .setNamespaceID(j.getNamespaceId()).build();
   }
 }

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/journalservice/JournalService.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/journalservice/JournalService.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/journalservice/JournalService.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/journalservice/JournalService.java Sat Apr  7 22:53:55 2012
@@ -31,6 +31,9 @@ import org.apache.hadoop.hdfs.protocolPB
 import org.apache.hadoop.hdfs.protocolPB.JournalProtocolServerSideTranslatorPB;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NamenodeRole;
 import org.apache.hadoop.hdfs.server.common.StorageInfo;
+import org.apache.hadoop.hdfs.server.protocol.FenceResponse;
+import org.apache.hadoop.hdfs.server.protocol.FencedException;
+import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
 import org.apache.hadoop.hdfs.server.protocol.JournalProtocol;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
@@ -40,6 +43,7 @@ import org.apache.hadoop.ipc.RPC;
 import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.security.UserGroupInformation;
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.protobuf.BlockingService;
 
 /**
@@ -66,6 +70,8 @@ public class JournalService implements J
   private final NamenodeProtocol namenode;
   private final StateHandler stateHandler = new StateHandler();
   private final RPC.Server rpcServer;
+  private long epoch = 0;
+  private String fencerInfo;
   
   enum State {
     /** The service is initialized and ready to start. */
@@ -115,7 +121,7 @@ public class JournalService implements J
       current = State.WAITING_FOR_ROLL;
     }
 
-    synchronized void startLogSegment() throws IOException {
+    synchronized void startLogSegment() {
       if (current == State.WAITING_FOR_ROLL) {
         current = State.SYNCING;
       }
@@ -232,28 +238,42 @@ public class JournalService implements J
   }
 
   @Override
-  public void journal(NamenodeRegistration registration, long firstTxnId,
+  public void journal(JournalInfo journalInfo, long epoch, long firstTxnId,
       int numTxns, byte[] records) throws IOException {
     if (LOG.isTraceEnabled()) {
       LOG.trace("Received journal " + firstTxnId + " " + numTxns);
     }
     stateHandler.isJournalAllowed();
-    verify(registration);
+    verify(epoch, journalInfo);
     listener.journal(this, firstTxnId, numTxns, records);
   }
 
   @Override
-  public void startLogSegment(NamenodeRegistration registration, long txid)
+  public void startLogSegment(JournalInfo journalInfo, long epoch, long txid)
       throws IOException {
     if (LOG.isTraceEnabled()) {
       LOG.trace("Received startLogSegment " + txid);
     }
     stateHandler.isStartLogSegmentAllowed();
-    verify(registration);
+    verify(epoch, journalInfo);
     listener.rollLogs(this, txid);
     stateHandler.startLogSegment();
   }
 
+  @Override
+  public FenceResponse fence(JournalInfo journalInfo, long epoch,
+      String fencerInfo) throws IOException {
+    LOG.info("Fenced by " + fencerInfo + " with epoch " + epoch);
+    verifyFence(epoch, fencerInfo);
+    verify(journalInfo);
+    long previousEpoch = epoch;
+    this.epoch = epoch;
+    this.fencerInfo = fencerInfo;
+    
+    // TODO:HDFS-3092 set lastTransId and inSync
+    return new FenceResponse(previousEpoch, 0, false);
+  }
+
   /** Create an RPC server. */
   private static RPC.Server createRpcServer(Configuration conf,
       InetSocketAddress address, JournalProtocol impl) throws IOException {
@@ -267,15 +287,54 @@ public class JournalService implements J
         address.getHostName(), address.getPort(), 1, false, conf, null);
   }
   
-  private void verify(NamenodeRegistration reg) throws IOException {
-    if (!registration.getRegistrationID().equals(reg.getRegistrationID())) {
-      LOG.warn("Invalid registrationID - expected: "
-          + registration.getRegistrationID() + " received: "
-          + reg.getRegistrationID());
-      throw new UnregisteredNodeException(reg);
+  private void verifyEpoch(long e) throws FencedException {
+    if (epoch != e) {
+      String errorMsg = "Epoch " + e + " is not valid. "
+          + "Resource has already been fenced by " + fencerInfo
+          + " with epoch " + epoch;
+      LOG.warn(errorMsg);
+      throw new FencedException(errorMsg);
+    }
+  }
+  
+  private void verifyFence(long e, String fencer) throws FencedException {
+    if (e <= epoch) {
+      String errorMsg = "Epoch " + e + " from fencer " + fencer
+          + " is not valid. " + "Resource has already been fenced by "
+          + fencerInfo + " with epoch " + epoch;
+      LOG.warn(errorMsg);
+      throw new FencedException(errorMsg);
+    }
+  }
+  
+  /** 
+   * Verifies a journal request
+   */
+  private void verify(JournalInfo journalInfo) throws IOException {
+    String errorMsg = null;
+    int expectedNamespaceID = registration.getNamespaceID();
+    if (journalInfo.getNamespaceId() != expectedNamespaceID) {
+      errorMsg = "Invalid namespaceID in journal request - expected " + expectedNamespaceID
+          + " actual " + journalInfo.getNamespaceId();
+      LOG.warn(errorMsg);
+      throw new UnregisteredNodeException(journalInfo);
+    } 
+    if (!journalInfo.getClusterId().equals(registration.getClusterID())) {
+      errorMsg = "Invalid clusterId in journal request - expected "
+          + journalInfo.getClusterId() + " actual " + registration.getClusterID();
+      LOG.warn(errorMsg);
+      throw new UnregisteredNodeException(journalInfo);
     }
   }
   
+  /** 
+   * Verifies a journal request
+   */
+  private void verify(long e, JournalInfo journalInfo) throws IOException {
+    verifyEpoch(e);
+    verify(journalInfo);
+  }
+  
   /**
    * Register this service with the active namenode.
    */
@@ -298,4 +357,9 @@ public class JournalService implements J
     listener.verifyVersion(this, nsInfo);
     registration.setStorageInfo(nsInfo);
   }
-}
\ No newline at end of file
+
+  @VisibleForTesting
+  long getEpoch() {
+    return epoch;
+  }
+}

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupJournalManager.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupJournalManager.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupJournalManager.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupJournalManager.java Sat Apr  7 22:53:55 2012
@@ -19,6 +19,7 @@ package org.apache.hadoop.hdfs.server.na
 
 import java.io.IOException;
 
+import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
 
 /**
@@ -26,19 +27,20 @@ import org.apache.hadoop.hdfs.server.pro
  * to a BackupNode.
  */
 class BackupJournalManager implements JournalManager {
-
-  private final NamenodeRegistration nnReg;
   private final NamenodeRegistration bnReg;
+  private final JournalInfo journalInfo;
   
   BackupJournalManager(NamenodeRegistration bnReg,
       NamenodeRegistration nnReg) {
+    journalInfo = new JournalInfo(nnReg.getLayoutVersion(),
+        nnReg.getClusterID(), nnReg.getNamespaceID());
     this.bnReg = bnReg;
-    this.nnReg = nnReg;
   }
 
   @Override
   public EditLogOutputStream startLogSegment(long txId) throws IOException {
-    EditLogBackupOutputStream stm = new EditLogBackupOutputStream(bnReg, nnReg);
+    EditLogBackupOutputStream stm = new EditLogBackupOutputStream(bnReg,
+        journalInfo);
     stm.startLogSegment(txId);
     return stm;
   }

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupNode.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupNode.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupNode.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupNode.java Sat Apr  7 22:53:55 2012
@@ -35,6 +35,8 @@ import org.apache.hadoop.hdfs.protocolPB
 import org.apache.hadoop.hdfs.protocolPB.JournalProtocolServerSideTranslatorPB;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NamenodeRole;
 import org.apache.hadoop.hdfs.server.common.Storage;
+import org.apache.hadoop.hdfs.server.protocol.FenceResponse;
+import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
 import org.apache.hadoop.hdfs.server.protocol.JournalProtocol;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
@@ -217,7 +219,8 @@ public class BackupNode extends NameNode
   }
   
   /* @Override */// NameNode
-  public boolean setSafeMode(SafeModeAction action) throws IOException {
+  public boolean setSafeMode(@SuppressWarnings("unused") SafeModeAction action)
+      throws IOException {
     throw new UnsupportedActionException("setSafeMode");
   }
   
@@ -236,51 +239,56 @@ public class BackupNode extends NameNode
     
     /** 
      * Verifies a journal request
-     * @param nodeReg node registration
-     * @throws UnregisteredNodeException if the registration is invalid
      */
-    void verifyJournalRequest(NamenodeRegistration reg) throws IOException {
-      verifyVersion(reg.getLayoutVersion());
+    private void verifyJournalRequest(JournalInfo journalInfo)
+        throws IOException {
+      verifyVersion(journalInfo.getLayoutVersion());
       String errorMsg = null;
       int expectedNamespaceID = namesystem.getNamespaceInfo().getNamespaceID();
-      if (reg.getNamespaceID() != expectedNamespaceID) {
+      if (journalInfo.getNamespaceId() != expectedNamespaceID) {
         errorMsg = "Invalid namespaceID in journal request - expected " + expectedNamespaceID
-            + " actual " + reg.getNamespaceID();
+            + " actual " + journalInfo.getNamespaceId();
         LOG.warn(errorMsg);
-        throw new UnregisteredNodeException(reg);
+        throw new UnregisteredNodeException(journalInfo);
       } 
-      if (!reg.getClusterID().equals(namesystem.getClusterId())) {
+      if (!journalInfo.getClusterId().equals(namesystem.getClusterId())) {
         errorMsg = "Invalid clusterId in journal request - expected "
-            + reg.getClusterID() + " actual " + namesystem.getClusterId();
+            + journalInfo.getClusterId() + " actual " + namesystem.getClusterId();
         LOG.warn(errorMsg);
-        throw new UnregisteredNodeException(reg);
+        throw new UnregisteredNodeException(journalInfo);
       }
     }
 
-
     /////////////////////////////////////////////////////
     // BackupNodeProtocol implementation for backup node.
     /////////////////////////////////////////////////////
     @Override
-    public void startLogSegment(NamenodeRegistration registration, long txid)
-        throws IOException {
+    public void startLogSegment(JournalInfo journalInfo, long epoch,
+        long txid) throws IOException {
       namesystem.checkOperation(OperationCategory.JOURNAL);
-      verifyJournalRequest(registration);
+      verifyJournalRequest(journalInfo);
       getBNImage().namenodeStartedLogSegment(txid);
     }
     
     @Override
-    public void journal(NamenodeRegistration nnReg,
-        long firstTxId, int numTxns,
-        byte[] records) throws IOException {
+    public void journal(JournalInfo journalInfo, long epoch, long firstTxId,
+        int numTxns, byte[] records) throws IOException {
       namesystem.checkOperation(OperationCategory.JOURNAL);
-      verifyJournalRequest(nnReg);
+      verifyJournalRequest(journalInfo);
       getBNImage().journal(firstTxId, numTxns, records);
     }
 
     private BackupImage getBNImage() {
       return (BackupImage)nn.getFSImage();
     }
+
+    @Override
+    public FenceResponse fence(JournalInfo journalInfo, long epoch,
+        String fencerInfo) throws IOException {
+      LOG.info("Fenced by " + fencerInfo + " with epoch " + epoch);
+      throw new UnsupportedOperationException(
+          "BackupNode does not support fence");
+    }
   }
   
   //////////////////////////////////////////////////////

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/EditLogBackupOutputStream.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/EditLogBackupOutputStream.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/EditLogBackupOutputStream.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/EditLogBackupOutputStream.java Sat Apr  7 22:53:55 2012
@@ -24,6 +24,7 @@ import java.util.Arrays;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.NameNodeProxies;
 import org.apache.hadoop.hdfs.server.common.Storage;
+import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
 import org.apache.hadoop.hdfs.server.protocol.JournalProtocol;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
 import org.apache.hadoop.io.DataOutputBuffer;
@@ -42,18 +43,18 @@ import org.apache.hadoop.security.UserGr
 class EditLogBackupOutputStream extends EditLogOutputStream {
   static int DEFAULT_BUFFER_SIZE = 256;
 
-  private JournalProtocol backupNode;  // RPC proxy to backup node
-  private NamenodeRegistration bnRegistration;  // backup node registration
-  private NamenodeRegistration nnRegistration;  // active node registration
+  private final JournalProtocol backupNode;  // RPC proxy to backup node
+  private final NamenodeRegistration bnRegistration;  // backup node registration
+  private final JournalInfo journalInfo;  // active node registration
+  private final DataOutputBuffer out;     // serialized output sent to backup node
   private EditsDoubleBuffer doubleBuf;
-  private DataOutputBuffer out;     // serialized output sent to backup node
 
   EditLogBackupOutputStream(NamenodeRegistration bnReg, // backup node
-                            NamenodeRegistration nnReg) // active name-node
+                            JournalInfo journalInfo) // active name-node
   throws IOException {
     super();
     this.bnRegistration = bnReg;
-    this.nnRegistration = nnReg;
+    this.journalInfo = journalInfo;
     InetSocketAddress bnAddress =
       NetUtils.createSocketAddr(bnRegistration.getAddress());
     try {
@@ -127,8 +128,7 @@ class EditLogBackupOutputStream extends 
       out.reset();
       assert out.getLength() == 0 : "Output buffer is not empty";
 
-      backupNode.journal(nnRegistration,
-          firstTxToFlush, numReadyTxns, data);
+      backupNode.journal(journalInfo, 0, firstTxToFlush, numReadyTxns, data);
     }
   }
 
@@ -140,6 +140,6 @@ class EditLogBackupOutputStream extends 
   }
 
   void startLogSegment(long txId) throws IOException {
-    backupNode.startLogSegment(nnRegistration, txId);
+    backupNode.startLogSegment(journalInfo, 0, txId);
   }
 }

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalProtocol.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalProtocol.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalProtocol.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalProtocol.java Sat Apr  7 22:53:55 2012
@@ -21,7 +21,6 @@ import java.io.IOException;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
-import org.apache.hadoop.ipc.VersionedProtocol;
 import org.apache.hadoop.security.KerberosInfo;
 
 /**
@@ -53,12 +52,15 @@ public interface JournalProtocol {
    * via {@code EditLogBackupOutputStream} in order to synchronize meta-data
    * changes with the backup namespace image.
    * 
-   * @param registration active node registration
+   * @param journalInfo journal information
+   * @param epoch marks beginning a new journal writer
    * @param firstTxnId the first transaction of this batch
    * @param numTxns number of transactions
    * @param records byte array containing serialized journal records
+   * @throws FencedException if the resource has been fenced
    */
-  public void journal(NamenodeRegistration registration,
+  public void journal(JournalInfo journalInfo,
+                      long epoch,
                       long firstTxnId,
                       int numTxns,
                       byte[] records) throws IOException;
@@ -66,9 +68,24 @@ public interface JournalProtocol {
   /**
    * Notify the BackupNode that the NameNode has rolled its edit logs
    * and is now writing a new log segment.
-   * @param registration the registration of the active NameNode
+   * @param journalInfo journal information
+   * @param epoch marks beginning a new journal writer
    * @param txid the first txid in the new log
+   * @throws FencedException if the resource has been fenced
    */
-  public void startLogSegment(NamenodeRegistration registration,
+  public void startLogSegment(JournalInfo journalInfo, long epoch,
       long txid) throws IOException;
+  
+  /**
+   * Request to fence any other journal writers.
+   * Older writers with at previous epoch will be fenced and can no longer
+   * perform journal operations.
+   * 
+   * @param journalInfo journal information
+   * @param epoch marks beginning a new journal writer
+   * @param fencerInfo info about fencer for debugging purposes
+   * @throws FencedException if the resource has been fenced
+   */
+  public FenceResponse fence(JournalInfo journalInfo, long epoch,
+      String fencerInfo) throws IOException;
 }

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/GetConf.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/GetConf.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/GetConf.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/GetConf.java Sat Apr  7 22:53:55 2012
@@ -21,10 +21,12 @@ import java.io.IOException;
 import java.io.PrintStream;
 import java.net.InetSocketAddress;
 import java.security.PrivilegedExceptionAction;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import org.apache.hadoop.HadoopIllegalArgumentException;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.hdfs.DFSUtil;
@@ -70,7 +72,8 @@ public class GetConf extends Configured 
     EXCLUDE_FILE("-excludeFile",
         "gets the exclude file path that defines the datanodes " +
         "that need to decommissioned."),
-    NNRPCADDRESSES("-nnRpcAddresses", "gets the namenode rpc addresses");
+    NNRPCADDRESSES("-nnRpcAddresses", "gets the namenode rpc addresses"),
+    CONFKEY("-confKey [key]", "gets a specific key from the configuration");
 
     private static Map<String, CommandHandler> map;
     static  {
@@ -87,6 +90,8 @@ public class GetConf extends Configured 
           new CommandHandler("DFSConfigKeys.DFS_HOSTS_EXCLUDE"));
       map.put(NNRPCADDRESSES.getName().toLowerCase(),
           new NNRpcAddressesCommandHandler());
+      map.put(CONFKEY.getName().toLowerCase(),
+          new PrintConfKeyCommandHandler());
     }
     
     private final String cmd;
@@ -98,6 +103,10 @@ public class GetConf extends Configured 
     }
 
     public String getName() {
+      return cmd.split(" ")[0];
+    }
+    
+    public String getUsage() {
       return cmd;
     }
     
@@ -105,8 +114,8 @@ public class GetConf extends Configured 
       return description;
     }
     
-    public static CommandHandler getHandler(String name) {
-      return map.get(name.toLowerCase());
+    public static CommandHandler getHandler(String cmd) {
+      return map.get(cmd.toLowerCase());
     }
   }
   
@@ -118,7 +127,7 @@ public class GetConf extends Configured 
     StringBuilder usage = new StringBuilder(DESCRIPTION);
     usage.append("\nhadoop getconf \n");
     for (Command cmd : Command.values()) {
-      usage.append("\t[" + cmd.getName() + "]\t\t\t" + cmd.getDescription()
+      usage.append("\t[" + cmd.getUsage() + "]\t\t\t" + cmd.getDescription()
           + "\n");
     }
     USAGE = usage.toString();
@@ -128,7 +137,7 @@ public class GetConf extends Configured 
    * Handler to return value for key corresponding to the {@link Command}
    */
   static class CommandHandler {
-    final String key; // Configuration key to lookup
+    String key; // Configuration key to lookup
     
     CommandHandler() {
       this(null);
@@ -138,18 +147,30 @@ public class GetConf extends Configured 
       this.key = key;
     }
 
-    final int doWork(GetConf tool) {
+    final int doWork(GetConf tool, String[] args) {
       try {
-        return doWorkInternal(tool);
+        checkArgs(args);
+
+        return doWorkInternal(tool, args);
       } catch (Exception e) {
         tool.printError(e.getMessage());
       }
       return -1;
     }
+
+    protected void checkArgs(String args[]) {
+      if (args.length > 0) {
+        throw new HadoopIllegalArgumentException(
+            "Did not expect argument: " + args[0]);
+      }
+    }
+
     
-    /** Method to be overridden by sub classes for specific behavior */
-    int doWorkInternal(GetConf tool) throws Exception {
-      String value = tool.getConf().get(key);
+    /** Method to be overridden by sub classes for specific behavior 
+     * @param args */
+    int doWorkInternal(GetConf tool, String[] args) throws Exception {
+
+      String value = tool.getConf().getTrimmed(key);
       if (value != null) {
         tool.printOut(value);
         return 0;
@@ -164,7 +185,7 @@ public class GetConf extends Configured 
    */
   static class NameNodesCommandHandler extends CommandHandler {
     @Override
-    int doWorkInternal(GetConf tool) throws IOException {
+    int doWorkInternal(GetConf tool, String []args) throws IOException {
       tool.printMap(DFSUtil.getNNServiceRpcAddresses(tool.getConf()));
       return 0;
     }
@@ -175,7 +196,7 @@ public class GetConf extends Configured 
    */
   static class BackupNodesCommandHandler extends CommandHandler {
     @Override
-    public int doWorkInternal(GetConf tool) throws IOException {
+    public int doWorkInternal(GetConf tool, String []args) throws IOException {
       tool.printMap(DFSUtil.getBackupNodeAddresses(tool.getConf()));
       return 0;
     }
@@ -186,7 +207,7 @@ public class GetConf extends Configured 
    */
   static class SecondaryNameNodesCommandHandler extends CommandHandler {
     @Override
-    public int doWorkInternal(GetConf tool) throws IOException {
+    public int doWorkInternal(GetConf tool, String []args) throws IOException {
       tool.printMap(DFSUtil.getSecondaryNameNodeAddresses(tool.getConf()));
       return 0;
     }
@@ -199,7 +220,7 @@ public class GetConf extends Configured 
    */
   static class NNRpcAddressesCommandHandler extends CommandHandler {
     @Override
-    public int doWorkInternal(GetConf tool) throws IOException {
+    public int doWorkInternal(GetConf tool, String []args) throws IOException {
       Configuration config = tool.getConf();
       List<ConfiguredNNAddress> cnnlist = DFSUtil.flattenAddressMap(
           DFSUtil.getNNServiceRpcAddresses(config));
@@ -215,6 +236,23 @@ public class GetConf extends Configured 
     }
   }
   
+  static class PrintConfKeyCommandHandler extends CommandHandler {
+    @Override
+    protected void checkArgs(String[] args) {
+      if (args.length != 1) {
+        throw new HadoopIllegalArgumentException(
+            "usage: " + Command.CONFKEY.getUsage());
+      }
+    }
+
+    @Override
+    int doWorkInternal(GetConf tool, String[] args) throws Exception {
+      this.key = args[0];
+      System.err.println("key: " + key);
+      return super.doWorkInternal(tool, args);
+    }
+  }
+  
   private final PrintStream out; // Stream for printing command output
   private final PrintStream err; // Stream for printing error
 
@@ -260,10 +298,11 @@ public class GetConf extends Configured 
    * @return return status of the command
    */
   private int doWork(String[] args) {
-    if (args.length == 1) {
+    if (args.length >= 1) {
       CommandHandler handler = Command.getHandler(args[0]);
       if (handler != null) {
-        return handler.doWork(this);
+        return handler.doWork(this,
+            Arrays.copyOfRange(args, 1, args.length));
       }
     }
     printUsage();

Propchange: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/
------------------------------------------------------------------------------
  Merged /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native:r1310174-1310901

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.c
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.c?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.c (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.c Sat Apr  7 22:53:55 2012
@@ -123,6 +123,11 @@ static int errnoFromException(jthrowable
       goto done;
     }
 
+    if (!strcmp(excClass, "java.lang.UnsupportedOperationException")) {
+      errnum = ENOTSUP;
+      goto done;
+    }
+
     if (!strcmp(excClass, "org.apache.hadoop.security."
                 "AccessControlException")) {
         errnum = EACCES;
@@ -614,8 +619,29 @@ hdfsFile hdfsOpenFile(hdfsFS fs, const c
     } else {
         file->file = (*env)->NewGlobalRef(env, jVal.l);
         file->type = (((flags & O_WRONLY) == 0) ? INPUT : OUTPUT);
+        file->flags = 0;
 
         destroyLocalReference(env, jVal.l);
+
+        if ((flags & O_WRONLY) == 0) {
+          // Try a test read to see if we can do direct reads
+          errno = 0;
+          char buf;
+          if (readDirect(fs, file, &buf, 0) == 0) {
+            // Success - 0-byte read should return 0
+            file->flags |= HDFS_FILE_SUPPORTS_DIRECT_READ;
+          } else {
+            if (errno != ENOTSUP) {
+              // Unexpected error. Clear it, don't set the direct flag.
+              fprintf(stderr,
+                      "WARN: Unexpected error %d when testing "
+                      "for direct read compatibility\n", errno);
+              errno = 0;
+              goto done;
+            }
+          }
+          errno = 0;
+        }
     }
 
     done:
@@ -706,10 +732,57 @@ int hdfsExists(hdfsFS fs, const char *pa
     return jVal.z ? 0 : -1;
 }
 
+// Checks input file for readiness for reading.
+static int readPrepare(JNIEnv* env, hdfsFS fs, hdfsFile f,
+                       jobject* jInputStream)
+{
+    *jInputStream = (jobject)(f ? f->file : NULL);
 
+    //Sanity check
+    if (!f || f->type == UNINITIALIZED) {
+      errno = EBADF;
+      return -1;
+    }
+
+    //Error checking... make sure that this file is 'readable'
+    if (f->type != INPUT) {
+      fprintf(stderr, "Cannot read from a non-InputStream object!\n");
+      errno = EINVAL;
+      return -1;
+    }
+
+    return 0;
+}
+
+// Common error-handling code between read paths.
+static int handleReadResult(int success, jvalue jVal, jthrowable jExc,
+                            JNIEnv* env)
+{
+  int noReadBytes;
+  if (success != 0) {
+    if ((*env)->ExceptionCheck(env)) {
+      errno = errnoFromException(jExc, env, "org.apache.hadoop.fs."
+                                 "FSDataInputStream::read");
+    }
+    noReadBytes = -1;
+  } else {
+    noReadBytes = jVal.i;
+    if (noReadBytes < 0) {
+      // -1 from Java is EOF, which is 0 here
+      noReadBytes = 0;
+    }
+    errno = 0;
+  }
+
+  return noReadBytes;
+}
 
 tSize hdfsRead(hdfsFS fs, hdfsFile f, void* buffer, tSize length)
 {
+    if (f->flags & HDFS_FILE_SUPPORTS_DIRECT_READ) {
+      return readDirect(fs, f, buffer, length);
+    }
+
     // JAVA EQUIVALENT:
     //  byte [] bR = new byte[length];
     //  fis.read(bR);
@@ -722,49 +795,75 @@ tSize hdfsRead(hdfsFS fs, hdfsFile f, vo
     }
 
     //Parameters
-    jobject jInputStream = (jobject)(f ? f->file : NULL);
+    jobject jInputStream;
+    if (readPrepare(env, fs, f, &jInputStream) == -1) {
+      return -1;
+    }
 
     jbyteArray jbRarray;
     jint noReadBytes = 0;
     jvalue jVal;
     jthrowable jExc = NULL;
 
-    //Sanity check
-    if (!f || f->type == UNINITIALIZED) {
-        errno = EBADF;
-        return -1;
+    //Read the requisite bytes
+    jbRarray = (*env)->NewByteArray(env, length);
+
+    int success = invokeMethod(env, &jVal, &jExc, INSTANCE, jInputStream, HADOOP_ISTRM,
+                               "read", "([B)I", jbRarray);
+
+    noReadBytes = handleReadResult(success, jVal, jExc, env);;
+
+    if (noReadBytes > 0) {
+      (*env)->GetByteArrayRegion(env, jbRarray, 0, noReadBytes, buffer);
     }
 
-    //Error checking... make sure that this file is 'readable'
-    if (f->type != INPUT) {
-        fprintf(stderr, "Cannot read from a non-InputStream object!\n");
-        errno = EINVAL;
-        return -1;
+    destroyLocalReference(env, jbRarray);
+
+    return noReadBytes;
+}
+
+// Reads using the read(ByteBuffer) API, which does fewer copies
+tSize readDirect(hdfsFS fs, hdfsFile f, void* buffer, tSize length)
+{
+    // JAVA EQUIVALENT:
+    //  ByteBuffer bbuffer = ByteBuffer.allocateDirect(length) // wraps C buffer
+    //  fis.read(bbuffer);
+
+    //Get the JNIEnv* corresponding to current thread
+    JNIEnv* env = getJNIEnv();
+    if (env == NULL) {
+      errno = EINTERNAL;
+      return -1;
     }
 
-    //Read the requisite bytes
-    jbRarray = (*env)->NewByteArray(env, length);
-    if (invokeMethod(env, &jVal, &jExc, INSTANCE, jInputStream, HADOOP_ISTRM,
-                     "read", "([B)I", jbRarray) != 0) {
-        errno = errnoFromException(jExc, env, "org.apache.hadoop.fs."
-                                   "FSDataInputStream::read");
-        noReadBytes = -1;
+    jobject jInputStream;
+    if (readPrepare(env, fs, f, &jInputStream) == -1) {
+      return -1;
     }
-    else {
-        noReadBytes = jVal.i;
-        if (noReadBytes > 0) {
-            (*env)->GetByteArrayRegion(env, jbRarray, 0, noReadBytes, buffer);
-        }  else {
-            //This is a valid case: there aren't any bytes left to read!
-          if (noReadBytes == 0 || noReadBytes < -1) {
-            fprintf(stderr, "WARN: FSDataInputStream.read returned invalid return code - libhdfs returning EOF, i.e., 0: %d\n", noReadBytes);
-          }
-            noReadBytes = 0;
-        }
-        errno = 0;
+
+    jint noReadBytes = 0;
+    jvalue jVal;
+    jthrowable jExc = NULL;
+
+    //Read the requisite bytes
+    jobject bb = (*env)->NewDirectByteBuffer(env, buffer, length);
+    if (bb == NULL) {
+      fprintf(stderr, "Could not allocate ByteBuffer");
+      if ((*env)->ExceptionCheck(env)) {
+        errno = errnoFromException(NULL, env, "JNIEnv::NewDirectByteBuffer");
+      } else {
+        errno = ENOMEM; // Best guess if there's no exception waiting
+      }
+      return -1;
     }
 
-    destroyLocalReference(env, jbRarray);
+    int success = invokeMethod(env, &jVal, &jExc, INSTANCE, jInputStream,
+                               HADOOP_ISTRM, "read", "(Ljava/nio/ByteBuffer;)I",
+                               bb);
+
+    noReadBytes = handleReadResult(success, jVal, jExc, env);
+
+    destroyLocalReference(env, bb);
 
     return noReadBytes;
 }

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.h
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.h?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.h (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.h Sat Apr  7 22:53:55 2012
@@ -81,12 +81,16 @@ extern  "C" {
     };
 
     
+    // Bit fields for hdfsFile_internal flags
+    #define HDFS_FILE_SUPPORTS_DIRECT_READ (1<<0)
+
     /**
      * The 'file-handle' to a file in hdfs.
      */
     struct hdfsFile_internal {
         void* file;
         enum hdfsStreamType type;
+        uint32_t flags;
     };
     typedef struct hdfsFile_internal* hdfsFile;
       
@@ -203,7 +207,6 @@ extern  "C" {
      */
     tSize hdfsRead(hdfsFS fs, hdfsFile file, void* buffer, tSize length);
 
-
     /** 
      * hdfsPread - Positional read of data from an open file.
      * @param fs The configured filesystem handle.

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs_test.c
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs_test.c?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs_test.c (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs_test.c Sat Apr  7 22:53:55 2012
@@ -18,6 +18,8 @@
 
 #include "hdfs.h" 
 
+tSize readDirect(hdfsFS fs, hdfsFile f, void* buffer, tSize length);
+
 void permission_disp(short permissions, char *rtr) {
   rtr[9] = '\0';
   int i;
@@ -51,7 +53,6 @@ void permission_disp(short permissions, 
 } 
 
 int main(int argc, char **argv) {
-
     hdfsFS fs = hdfsConnectNewInstance("default", 0);
     if(!fs) {
         fprintf(stderr, "Oops! Failed to connect to hdfs!\n");
@@ -64,20 +65,25 @@ int main(int argc, char **argv) {
         exit(-1);
     } 
 
-        const char* writePath = "/tmp/testfile.txt";
+    const char* writePath = "/tmp/testfile.txt";
+    const char* fileContents = "Hello, World!";
+
     {
         //Write tests
         
-        
         hdfsFile writeFile = hdfsOpenFile(fs, writePath, O_WRONLY|O_CREAT, 0, 0, 0);
         if(!writeFile) {
             fprintf(stderr, "Failed to open %s for writing!\n", writePath);
             exit(-1);
         }
         fprintf(stderr, "Opened %s for writing successfully...\n", writePath);
-
-        char* buffer = "Hello, World!";
-        tSize num_written_bytes = hdfsWrite(fs, writeFile, (void*)buffer, strlen(buffer)+1);
+        tSize num_written_bytes =
+          hdfsWrite(fs, writeFile, (void*)fileContents, strlen(fileContents)+1);
+        if (num_written_bytes != strlen(fileContents) + 1) {
+          fprintf(stderr, "Failed to write correct number of bytes - expected %d, got %d\n",
+                  (int)(strlen(fileContents) + 1), (int)num_written_bytes);
+            exit(-1);
+        }
         fprintf(stderr, "Wrote %d bytes\n", num_written_bytes);
 
         tOffset currentPos = -1;
@@ -138,18 +144,86 @@ int main(int argc, char **argv) {
         }
         fprintf(stderr, "Current position: %ld\n", currentPos);
 
+        if ((readFile->flags & HDFS_FILE_SUPPORTS_DIRECT_READ) == 0) {
+          fprintf(stderr, "Direct read support incorrectly not detected "
+                  "for HDFS filesystem\n");
+          exit(-1);
+        }
+
+        fprintf(stderr, "Direct read support detected for HDFS\n");
+
+        // Clear flags so that we really go through slow read path
+        readFile->flags &= ~HDFS_FILE_SUPPORTS_DIRECT_READ;
+
         static char buffer[32];
         tSize num_read_bytes = hdfsRead(fs, readFile, (void*)buffer, 
                 sizeof(buffer));
         fprintf(stderr, "Read following %d bytes:\n%s\n", 
                 num_read_bytes, buffer);
 
+        memset(buffer, 0, strlen(fileContents + 1));
+
         num_read_bytes = hdfsPread(fs, readFile, 0, (void*)buffer, 
                 sizeof(buffer));
         fprintf(stderr, "Read following %d bytes:\n%s\n", 
                 num_read_bytes, buffer);
 
+        if (hdfsSeek(fs, readFile, 0L)) {
+            fprintf(stderr,
+                    "Failed to seek to file start for direct read test!\n");
+            exit(-1);
+        }
+
+        readFile->flags |= HDFS_FILE_SUPPORTS_DIRECT_READ;
+
+        memset(buffer, 0, strlen(fileContents + 1));
+        num_read_bytes = hdfsRead(fs, readFile, (void*)buffer,
+                sizeof(buffer));
+        if (strncmp(fileContents, buffer, strlen(fileContents)) != 0) {
+            fprintf(stderr, "Failed to read (direct). Expected %s but got %s (%d bytes)\n",
+                    fileContents, buffer, num_read_bytes);
+            exit(-1);
+        }
+        fprintf(stderr, "Read (direct) following %d bytes:\n%s\n",
+                num_read_bytes, buffer);
         hdfsCloseFile(fs, readFile);
+
+        // Test correct behaviour for unsupported filesystems
+        hdfsFile localFile = hdfsOpenFile(lfs, writePath, O_WRONLY|O_CREAT, 0, 0, 0);
+        if(!localFile) {
+            fprintf(stderr, "Failed to open %s for writing!\n", writePath);
+            exit(-1);
+        }
+
+        tSize num_written_bytes = hdfsWrite(lfs, localFile,
+                                            (void*)fileContents,
+                                            strlen(fileContents) + 1);
+
+        hdfsCloseFile(lfs, localFile);
+        localFile = hdfsOpenFile(lfs, writePath, O_RDONLY, 0, 0, 0);
+
+        if (localFile->flags & HDFS_FILE_SUPPORTS_DIRECT_READ) {
+          fprintf(stderr, "Direct read support incorrectly detected for local "
+                  "filesystem\n");
+          exit(-1);
+        }
+
+        memset(buffer, 0, strlen(fileContents + 1));
+        int result = readDirect(lfs, localFile, (void*)buffer, sizeof(buffer));
+        if (result != -1) {
+          fprintf(stderr, "Expected error from local direct read not seen!\n");
+          exit(-1);
+        }
+
+        if (errno != ENOTSUP) {
+          fprintf(stderr, "Error code not correctly set to ENOTSUP, was %d!\n",
+                  errno);
+          exit(-1);
+        }
+
+        fprintf(stderr, "Expected exception thrown for unsupported direct read\n");
+
+        hdfsCloseFile(lfs, localFile);
     }
 
     int totalResult = 0;
@@ -446,4 +520,3 @@ int main(int argc, char **argv) {
 /**
  * vim: ts=4: sw=4: et:
  */
-

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/tests/test-libhdfs.sh
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/tests/test-libhdfs.sh?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/tests/test-libhdfs.sh (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/native/tests/test-libhdfs.sh Sat Apr  7 22:53:55 2012
@@ -17,126 +17,64 @@
 #
 
 #
-# Note: This script depends on 8 environment variables to function correctly:
-# a) CLASSPATH
-# b) HADOOP_PREFIX
-# c) HADOOP_CONF_DIR 
-# d) HADOOP_LOG_DIR 
-# e) LIBHDFS_BUILD_DIR
-# f) LIBHDFS_INSTALL_DIR
-# g) OS_NAME
-# h) CLOVER_JAR
-# i} HADOOP_VERSION
-# j) HADOOP_HDFS_HOME
-# All these are passed by build.xml.
+# Note: This script depends on 5 environment variables to function correctly:
+# a) HADOOP_HOME - must be set
+# b) HDFS_TEST_CONF_DIR - optional; the directory to read and write
+# core-site.xml to. Defaults to /tmp
+# c) LIBHDFS_BUILD_DIR - optional; the location of the hdfs_test
+# executable. Defaults to the parent directory.
+# d) OS_NAME - used to choose how to locate libjvm.so
+# e) CLOVER_JAR - optional; the location of the Clover code coverage tool's jar.
 #
 
-HDFS_TEST=hdfs_test
-HADOOP_LIB_DIR=$HADOOP_PREFIX/lib
-HADOOP_BIN_DIR=$HADOOP_PREFIX/bin
-
-COMMON_BUILD_DIR=$HADOOP_PREFIX/build/ivy/lib/hadoop-hdfs/common
-COMMON_JAR=$COMMON_BUILD_DIR/hadoop-common-$HADOOP_VERSION.jar
+if [ "x$HADOOP_HOME" == "x" ]; then
+  echo "HADOOP_HOME is unset!"
+  exit 1
+fi
 
-cat > $HADOOP_CONF_DIR/core-site.xml <<EOF
-<?xml version="1.0"?>
-<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
-<configuration>
-<property>
-  <name>hadoop.tmp.dir</name>
-  <value>file:///$LIBHDFS_TEST_DIR</value>
-</property>
-<property>
-  <name>fs.default.name</name>
-  <value>hdfs://localhost:23000/</value>
-</property>
-</configuration>
-EOF
-
-cat > $HADOOP_CONF_DIR/hdfs-site.xml <<EOF
-<?xml version="1.0"?>
-<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
-<configuration>
-<property>
-  <name>dfs.replication</name>
-  <value>1</value>
-</property>
-<property>
-  <name>dfs.support.append</name>
-  <value>true</value>
-</property>
-<property>
-  <name>dfs.namenode.logging.level</name>
-  <value>DEBUG</value>
-</property>
-</configuration>
-EOF
-
-cat > $HADOOP_CONF_DIR/slaves <<EOF
-localhost
-EOF
-
-# If we are running from the hdfs repo we need to make sure
-# HADOOP_BIN_DIR contains the common scripts.  
-# If the bin directory does not and we've got a common jar extract its
-# bin directory to HADOOP_PREFIX/bin. The bin scripts hdfs-config.sh and
-# hadoop-config.sh assume the bin directory is named "bin" and that it
-# is located in HADOOP_PREFIX.
-unpacked_common_bin_dir=0
-if [ ! -f $HADOOP_BIN_DIR/hadoop-config.sh ]; then
-  if [ -f $COMMON_JAR ]; then
-    jar xf $COMMON_JAR bin.tgz
-    tar xfz bin.tgz -C $HADOOP_BIN_DIR
-    unpacked_common_bin_dir=1
-  fi
+if [ "x$LIBHDFS_BUILD_DIR" == "x" ]; then
+  LIBHDFS_BUILD_DIR=`pwd`/../
 fi
 
-# Manipulate HADOOP_CONF_DIR too
-# which is necessary to circumvent bin/hadoop
-HADOOP_CONF_DIR=$HADOOP_CONF_DIR:$HADOOP_PREFIX/conf
+if [ "x$HDFS_TEST_CONF_DIR" == "x" ]; then
+  HDFS_TEST_CONF_DIR=/tmp
+fi
 
-# set pid file dir so they are not written to /tmp
-export HADOOP_PID_DIR=$HADOOP_LOG_DIR
+# LIBHDFS_INSTALL_DIR is the directory containing libhdfs.so
+LIBHDFS_INSTALL_DIR=$HADOOP_HOME/lib/native/
+HDFS_TEST=hdfs_test
 
-# CLASSPATH initially contains $HADOOP_CONF_DIR
-CLASSPATH="${HADOOP_CONF_DIR}"
-CLASSPATH=${CLASSPATH}:$JAVA_HOME/lib/tools.jar
+HDFS_TEST_JAR=`find $HADOOP_HOME/share/hadoop/hdfs/ \
+-name "hadoop-hdfs-*-tests.jar" | head -n 1`
 
-# for developers, add Hadoop classes to CLASSPATH
-if [ -d "$HADOOP_PREFIX/build/classes" ]; then
-  CLASSPATH=${CLASSPATH}:$HADOOP_PREFIX/build/classes
-fi
-if [ -d "$HADOOP_PREFIX/build/web/webapps" ]; then
-  CLASSPATH=${CLASSPATH}:$HADOOP_PREFIX/build/web
-fi
-if [ -d "$HADOOP_PREFIX/build/test/classes" ]; then
-  CLASSPATH=${CLASSPATH}:$HADOOP_PREFIX/build/test/classes
+if [ "x$HDFS_TEST_JAR" == "x" ]; then
+  echo "HDFS test jar not found! Tried looking in all subdirectories \
+of $HADOOP_HOME/share/hadoop/hdfs/"
+  exit 1
 fi
 
+echo "Found HDFS test jar at $HDFS_TEST_JAR"
+
+# CLASSPATH initially contains $HDFS_TEST_CONF_DIR
+CLASSPATH="${HDFS_TEST_CONF_DIR}"
+CLASSPATH=${CLASSPATH}:$JAVA_HOME/lib/tools.jar
+
 # add Clover jar file needed for code coverage runs
 CLASSPATH=${CLASSPATH}:${CLOVER_JAR};
 
 # so that filenames w/ spaces are handled correctly in loops below
-IFS=
+IFS=$'\n'
 
-# add libs to CLASSPATH
-for f in $HADOOP_PREFIX/lib/*.jar; do
-  CLASSPATH=${CLASSPATH}:$f;
-done
-
-for f in $HADOOP_PREFIX/*.jar; do 
-  CLASSPATH=${CLASSPATH}:$f
-done
-for f in $HADOOP_PREFIX/lib/jsp-2.1/*.jar; do
-  CLASSPATH=${CLASSPATH}:$f;
-done
-
-if [ -d "$COMMON_BUILD_DIR" ]; then
-  CLASSPATH=$CLASSPATH:$COMMON_JAR
-  for f in $COMMON_BUILD_DIR/*.jar; do
-    CLASSPATH=${CLASSPATH}:$f;
-  done
-fi
+JAR_DIRS="$HADOOP_HOME/share/hadoop/common/lib/
+$HADOOP_HOME/share/hadoop/common/
+$HADOOP_HOME/share/hadoop/hdfs
+$HADOOP_HOME/share/hadoop/hdfs/lib/"
+
+for d in $JAR_DIRS; do 
+  for j in $d/*.jar; do
+    CLASSPATH=${CLASSPATH}:$j
+  done;
+done;
 
 # restore ordinary behaviour
 unset IFS
@@ -178,21 +116,37 @@ echo  LIB_JVM_DIR = $LIB_JVM_DIR
 echo  "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
 # Put delays to ensure hdfs is up and running and also shuts down 
 # after the tests are complete
-cd $HADOOP_PREFIX
-echo Y | $HADOOP_BIN_DIR/hdfs namenode -format &&
-$HADOOP_BIN_DIR/hadoop-daemon.sh --script $HADOOP_BIN_DIR/hdfs start namenode && sleep 2
-$HADOOP_BIN_DIR/hadoop-daemon.sh --script $HADOOP_BIN_DIR/hdfs start datanode && sleep 2
-echo "Wait 30s for the datanode to start up..."
-sleep 30
-CLASSPATH=$CLASSPATH LD_PRELOAD="$LIB_JVM_DIR/libjvm.so:$LIBHDFS_INSTALL_DIR/libhdfs.so:" $LIBHDFS_BUILD_DIR/$HDFS_TEST
-BUILD_STATUS=$?
-sleep 3
-$HADOOP_BIN_DIR/hadoop-daemon.sh --script $HADOOP_BIN_DIR/hdfs stop datanode && sleep 2
-$HADOOP_BIN_DIR/hadoop-daemon.sh --script $HADOOP_BIN_DIR/hdfs stop namenode && sleep 2 
+rm $HDFS_TEST_CONF_DIR/core-site.xml
 
-if [ $unpacked_common_bin_dir -eq 1 ]; then
-  rm -rf bin.tgz
+$HADOOP_HOME/bin/hadoop jar $HDFS_TEST_JAR \
+    org.apache.hadoop.test.MiniDFSClusterManager \
+    -format -nnport 20300 -writeConfig $HDFS_TEST_CONF_DIR/core-site.xml \
+    > /tmp/libhdfs-test-cluster.out 2>&1 & 
+
+MINI_CLUSTER_PID=$!
+for i in {1..15}; do
+  echo "Waiting for DFS cluster, attempt $i of 15"
+  [ -f $HDFS_TEST_CONF_DIR/core-site.xml ] && break;
+  sleep 2
+done
+
+if [ ! -f $HDFS_TEST_CONF_DIR/core-site.xml ]; then
+  echo "Cluster did not come up in 30s"
+  kill -9 $MINI_CLUSTER_PID
+  exit 1
 fi
 
-echo exiting with $BUILD_STATUS
+echo "Cluster up, running tests"
+# Disable error checking to make sure we get to cluster cleanup
+set +e
+
+CLASSPATH=$CLASSPATH \
+LD_PRELOAD="$LIB_JVM_DIR/libjvm.so:$LIBHDFS_INSTALL_DIR/libhdfs.so:" \
+$LIBHDFS_BUILD_DIR/$HDFS_TEST
+
+BUILD_STATUS=$?
+
+echo "Tearing cluster down"
+kill -9 $MINI_CLUSTER_PID
+echo "Exiting with $BUILD_STATUS"
 exit $BUILD_STATUS

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/JournalProtocol.proto
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/JournalProtocol.proto?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/JournalProtocol.proto (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/JournalProtocol.proto Sat Apr  7 22:53:55 2012
@@ -36,16 +36,18 @@ message JournalInfoProto {
 }
 
 /**
- * JournalInfo - the information about the journal
+ * journalInfo - the information about the journal
  * firstTxnId - the first txid in the journal records
  * numTxns - Number of transactions in editlog
  * records - bytes containing serialized journal records
+ * epoch - change to this represents change of journal writer
  */
 message JournalRequestProto {
   required JournalInfoProto journalInfo = 1;
   required uint64 firstTxnId = 2;
   required uint32 numTxns = 3;
   required bytes records = 4;
+  required uint64 epoch = 5;
 }
 
 /**
@@ -55,12 +57,13 @@ message JournalResponseProto { 
 }
 
 /**
- * JournalInfo - the information about the journal
+ * journalInfo - the information about the journal
  * txid - first txid in the new log
  */
 message StartLogSegmentRequestProto {
-  required JournalInfoProto journalInfo = 1;
-  required uint64 txid = 2;
+  required JournalInfoProto journalInfo = 1; // Info about the journal
+  required uint64 txid = 2; // Transaction ID
+  required uint64 epoch = 3;
 }
 
 /**
@@ -70,6 +73,27 @@ message StartLogSegmentResponseProto { 
 }
 
 /**
+ * journalInfo - the information about the journal
+ * txid - first txid in the new log
+ */
+message FenceRequestProto {
+  required JournalInfoProto journalInfo = 1; // Info about the journal
+  required uint64 epoch = 2; // Epoch - change indicates change in writer
+  optional string fencerInfo = 3; // Info about fencer for debugging
+}
+
+/**
+ * previousEpoch - previous epoch if any or zero
+ * lastTransactionId - last valid transaction Id in the journal
+ * inSync - if all journal segments are available and in sync
+ */
+message FenceResponseProto {
+  optional uint64 previousEpoch = 1;
+  optional uint64 lastTransactionId = 2;
+  optional bool inSync = 3;
+}
+
+/**
  * Protocol used to journal edits to a remote node. Currently,
  * this is used to publish edits from the NameNode to a BackupNode.
  *
@@ -89,4 +113,10 @@ service JournalProtocolService {
    */
   rpc startLogSegment(StartLogSegmentRequestProto) 
       returns (StartLogSegmentResponseProto);
+  
+  /**
+   * Request to fence a journal receiver.
+   */
+  rpc fence(FenceRequestProto)
+      returns (FenceResponseProto);
 }

Propchange: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/datanode/
------------------------------------------------------------------------------
  Merged /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/datanode:r1310174-1310901

Propchange: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/
------------------------------------------------------------------------------
  Merged /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs:r1310174-1310901

Propchange: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/secondary/
------------------------------------------------------------------------------
  Merged /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/secondary:r1310174-1310901

Propchange: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/hdfs/
------------------------------------------------------------------------------
  Merged /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/hdfs:r1310174-1310901

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsFileStatusHdfs.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsFileStatusHdfs.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsFileStatusHdfs.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsFileStatusHdfs.java Sat Apr  7 22:53:55 2012
@@ -30,6 +30,7 @@ import java.net.URISyntaxException;
 import javax.security.auth.login.LoginException;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileChecksum;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.FileSystemTestHelper;
@@ -48,13 +49,13 @@ import static org.junit.Assert.*;
 public class TestViewFsFileStatusHdfs {
   
   static final String testfilename = "/tmp/testFileStatusSerialziation";
+  static final String someFile = "/hdfstmp/someFileForTestGetFileChecksum";
 
-  
-  
   private static MiniDFSCluster cluster;
   private static Path defaultWorkingDirectory;
   private static Configuration CONF = new Configuration();
   private static FileSystem fHdfs;
+  private static FileSystem vfs;
   
   @BeforeClass
   public static void clusterSetupAtBegining() throws IOException,
@@ -65,18 +66,19 @@ public class TestViewFsFileStatusHdfs {
     defaultWorkingDirectory = fHdfs.makeQualified( new Path("/user/" + 
         UserGroupInformation.getCurrentUser().getShortUserName()));
     fHdfs.mkdirs(defaultWorkingDirectory);
+
+    // Setup the ViewFS to be used for all tests.
+    Configuration conf = ViewFileSystemTestSetup.createConfig();
+    ConfigUtil.addLink(conf, "/vfstmp", new URI(fHdfs.getUri() + "/hdfstmp"));
+    ConfigUtil.addLink(conf, "/tmp", new URI(fHdfs.getUri() + "/tmp"));
+    vfs = FileSystem.get(FsConstants.VIEWFS_URI, conf);
+    assertEquals(ViewFileSystem.class, vfs.getClass());
   }
 
   @Test
   public void testFileStatusSerialziation()
       throws IOException, URISyntaxException {
-
    long len = FileSystemTestHelper.createFile(fHdfs, testfilename);
-
-    Configuration conf = ViewFileSystemTestSetup.createConfig();
-    ConfigUtil.addLink(conf, "/tmp", new URI(fHdfs.getUri().toString() + "/tmp"));
-    FileSystem vfs = FileSystem.get(FsConstants.VIEWFS_URI, conf);
-    assertEquals(ViewFileSystem.class, vfs.getClass());
     FileStatus stat = vfs.getFileStatus(new Path(testfilename));
     assertEquals(len, stat.getLen());
     // check serialization/deserialization
@@ -89,9 +91,34 @@ public class TestViewFsFileStatusHdfs {
     assertEquals(len, deSer.getLen());
   }
 
+  @Test
+  public void testGetFileChecksum() throws IOException, URISyntaxException {
+    // Create two different files in HDFS
+    FileSystemTestHelper.createFile(fHdfs, someFile);
+    FileSystemTestHelper.createFile(fHdfs, FileSystemTestHelper
+      .getTestRootPath(fHdfs, someFile + "other"), 1, 512);
+    // Get checksum through ViewFS
+    FileChecksum viewFSCheckSum = vfs.getFileChecksum(
+      new Path("/vfstmp/someFileForTestGetFileChecksum"));
+    // Get checksum through HDFS. 
+    FileChecksum hdfsCheckSum = fHdfs.getFileChecksum(
+      new Path(someFile));
+    // Get checksum of different file in HDFS
+    FileChecksum otherHdfsFileCheckSum = fHdfs.getFileChecksum(
+      new Path(someFile+"other"));
+    // Checksums of the same file (got through HDFS and ViewFS should be same)
+    assertEquals("HDFS and ViewFS checksums were not the same", viewFSCheckSum,
+      hdfsCheckSum);
+    // Checksum of different files should be different.
+    assertFalse("Some other HDFS file which should not have had the same " +
+      "checksum as viewFS did!", viewFSCheckSum.equals(otherHdfsFileCheckSum));
+  }
+
   @AfterClass
   public static void cleanup() throws IOException {
     fHdfs.delete(new Path(testfilename), true);
+    fHdfs.delete(new Path(someFile), true);
+    fHdfs.delete(new Path(someFile + "other"), true);
   }
 
 }

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/journalservice/TestJournalService.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/journalservice/TestJournalService.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/journalservice/TestJournalService.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/journalservice/TestJournalService.java Sat Apr  7 22:53:55 2012
@@ -20,12 +20,18 @@ package org.apache.hadoop.hdfs.server.jo
 import java.io.IOException;
 import java.net.InetSocketAddress;
 
+import junit.framework.Assert;
+
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.FileSystemTestHelper;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.server.namenode.NameNode;
+import org.apache.hadoop.hdfs.server.protocol.FenceResponse;
+import org.apache.hadoop.hdfs.server.protocol.FencedException;
+import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
 import org.junit.Test;
 import org.mockito.Mockito;
 
@@ -42,7 +48,7 @@ public class TestJournalService {
    * called.
    */
   @Test
-  public void testCallBacks() throws IOException {
+  public void testCallBacks() throws Exception {
     JournalListener listener = Mockito.mock(JournalListener.class);
     JournalService service = null;
     try {
@@ -51,6 +57,7 @@ public class TestJournalService {
       service = startJournalService(listener);
       verifyRollLogsCallback(service, listener);
       verifyJournalCallback(service, listener);
+      verifyFence(service, cluster.getNameNode(0));
     } finally {
       if (service != null) {
         service.stop();
@@ -93,4 +100,28 @@ public class TestJournalService {
     Mockito.verify(l, Mockito.atLeastOnce()).journal(Mockito.eq(s),
         Mockito.anyLong(), Mockito.anyInt(), (byte[]) Mockito.any());
   }
+  
+  public void verifyFence(JournalService s, NameNode nn) throws Exception {
+    String cid = nn.getNamesystem().getClusterId();
+    int nsId = nn.getNamesystem().getFSImage().getNamespaceID();
+    int lv = nn.getNamesystem().getFSImage().getLayoutVersion();
+    
+    // Fence the journal service
+    JournalInfo info = new JournalInfo(lv, cid, nsId);
+    long currentEpoch = s.getEpoch();
+    
+    // New epoch lower than the current epoch is rejected
+    try {
+      s.fence(info, (currentEpoch - 1), "fencer");
+    } catch (FencedException ignore) { /* Ignored */ } 
+    
+    // New epoch equal to the current epoch is rejected
+    try {
+      s.fence(info, currentEpoch, "fencer");
+    } catch (FencedException ignore) { /* Ignored */ } 
+    
+    // New epoch higher than the current epoch is successful
+    FenceResponse resp = s.fence(info, currentEpoch+1, "fencer");
+    Assert.assertNotNull(resp);
+  }
 }
\ No newline at end of file

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestGetConf.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestGetConf.java?rev=1310905&r1=1310904&r2=1310905&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestGetConf.java (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestGetConf.java Sat Apr  7 22:53:55 2012
@@ -42,6 +42,8 @@ import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.util.ToolRunner;
 import org.junit.Test;
 
+import com.google.common.base.Joiner;
+
 /**
  * Test for {@link GetConf}
  */
@@ -117,7 +119,12 @@ public class TestGetConf {
     PrintStream out = new PrintStream(o, true);
     try {
       int ret = ToolRunner.run(new GetConf(conf, out, out), args);
-      assertEquals(success, ret == 0);
+      out.flush();
+      System.err.println("Output: " + o.toString());
+      assertEquals("Expected " + (success?"success":"failure") +
+          " for args: " + Joiner.on(" ").join(args) + "\n" +
+          "Output: " + o.toString(),
+          success, ret == 0);
       return o.toString();
     } finally {
       o.close();
@@ -222,7 +229,9 @@ public class TestGetConf {
     getAddressListFromTool(TestType.SECONDARY, conf, false);
     getAddressListFromTool(TestType.NNRPCADDRESSES, conf, false);
     for (Command cmd : Command.values()) {
-      CommandHandler handler = Command.getHandler(cmd.getName());
+      String arg = cmd.getName();
+      CommandHandler handler = Command.getHandler(arg);
+      assertNotNull("missing handler: " + cmd, handler);
       if (handler.key != null) {
         // First test with configuration missing the required key
         String[] args = {handler.key};
@@ -319,18 +328,36 @@ public class TestGetConf {
     verifyAddresses(conf, TestType.SECONDARY, false, secondaryAddresses);
     verifyAddresses(conf, TestType.NNRPCADDRESSES, true, nnAddresses);
   }
+  
+  @Test
+  public void testGetSpecificKey() throws Exception {
+    HdfsConfiguration conf = new HdfsConfiguration();
+    conf.set("mykey", " myval ");
+    String[] args = {"-confKey", "mykey"};
+    assertTrue(runTool(conf, args, true).equals("myval\n"));
+  }
+  
+  @Test
+  public void testExtraArgsThrowsError() throws Exception {
+    HdfsConfiguration conf = new HdfsConfiguration();
+    conf.set("mykey", "myval");
+    String[] args = {"-namenodes", "unexpected-arg"};
+    assertTrue(runTool(conf, args, false).contains(
+        "Did not expect argument: unexpected-arg"));
+  }
 
   /**
    * Tests commands other than {@link Command#NAMENODE}, {@link Command#BACKUP},
    * {@link Command#SECONDARY} and {@link Command#NNRPCADDRESSES}
    */
+  @Test
   public void testTool() throws Exception {
     HdfsConfiguration conf = new HdfsConfiguration(false);
     for (Command cmd : Command.values()) {
       CommandHandler handler = Command.getHandler(cmd.getName());
-      if (handler.key != null) {
+      if (handler.key != null && !"-confKey".equals(cmd.getName())) {
         // Add the key to the conf and ensure tool returns the right value
-        String[] args = {handler.key};
+        String[] args = {cmd.getName()};
         conf.set(handler.key, "value");
         assertTrue(runTool(conf, args, true).contains("value"));
       }



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