HDFS-5590. Block ID and generation stamp may be reused when persistBlocks is set to false. Contributed by Jing Zhao.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548368 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -786,6 +786,9 @@ Release 2.3.0 - UNRELEASED
     HDFS-5587. add debug information when NFS fails to start with duplicate user
     or group names (brandonli)
 
+    HDFS-5590. Block ID and generation stamp may be reused when persistBlocks is 
+    set to false. (jing9)
+
 Release 2.2.0 - 2013-10-13
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java

@@ -166,8 +166,6 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final boolean DFS_WEBHDFS_ENABLED_DEFAULT = true;
   public static final String  DFS_PERMISSIONS_ENABLED_KEY = "dfs.permissions.enabled";
   public static final boolean DFS_PERMISSIONS_ENABLED_DEFAULT = true;
-  public static final String  DFS_PERSIST_BLOCKS_KEY = "dfs.persist.blocks";
-  public static final boolean DFS_PERSIST_BLOCKS_DEFAULT = false;
   public static final String  DFS_PERMISSIONS_SUPERUSERGROUP_KEY = "dfs.permissions.superusergroup";
   public static final String  DFS_PERMISSIONS_SUPERUSERGROUP_DEFAULT = "supergroup";
   public static final String  DFS_ADMIN = "dfs.cluster.administrators";

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -79,8 +79,6 @@
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_PERMISSIONS_ENABLED_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_PERMISSIONS_SUPERUSERGROUP_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_PERMISSIONS_SUPERUSERGROUP_KEY;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_PERSIST_BLOCKS_DEFAULT;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_PERSIST_BLOCKS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_REPLICATION_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_REPLICATION_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_SUPPORT_APPEND_DEFAULT;
@@ -153,6 +151,8 @@
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
+import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.ClientProtocol;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
@@ -164,8 +164,6 @@
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
-import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
-import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
 import org.apache.hadoop.hdfs.protocol.RecoveryInProgressException;
 import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
@@ -365,7 +363,6 @@ private void logAuditEvent(boolean succeeded,
   static final int DEFAULT_MAX_CORRUPT_FILEBLOCKS_RETURNED = 100;
   static int BLOCK_DELETION_INCREMENT = 1000;
   private final boolean isPermissionEnabled;
-  private final boolean persistBlocks;
   private final UserGroupInformation fsOwner;
   private final String fsOwnerShortUserName;
   private final String supergroup;
@@ -670,13 +667,10 @@ public static FSNamesystem loadFromDisk(Configuration conf)
       LOG.info("supergroup          = " + supergroup);
       LOG.info("isPermissionEnabled = " + isPermissionEnabled);
 
-      final boolean persistBlocks = conf.getBoolean(DFS_PERSIST_BLOCKS_KEY,
-                                                    DFS_PERSIST_BLOCKS_DEFAULT);
       // block allocation has to be persisted in HA using a shared edits directory
       // so that the standby has up-to-date namespace information
       String nameserviceId = DFSUtil.getNamenodeNameServiceId(conf);
       this.haEnabled = HAUtil.isHAEnabled(conf, nameserviceId);  
-      this.persistBlocks = persistBlocks || (haEnabled && HAUtil.usesSharedEditsDir(conf));
       
       // Sanity check the HA-related config.
       if (nameserviceId != null) {
@@ -2635,9 +2629,7 @@ LocatedBlock getAdditionalBlock(String src, long fileId, String clientName,
     } finally {
       writeUnlock();
     }
-    if (persistBlocks) {
+    getEditLog().logSync();
-      getEditLog().logSync();
-    }
 
     // Return located block
     return makeLocatedBlock(newBlock, targets, offset);
@@ -2828,9 +2820,7 @@ boolean abandonBlock(ExtendedBlock b, String src, String holder)
     } finally {
       writeUnlock();
     }
-    if (persistBlocks) {
+    getEditLog().logSync();
-      getEditLog().logSync();
-    }
 
     return true;
   }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestPersistBlocks.java

@@ -97,7 +97,6 @@ void testRestartDfs(boolean useFlush) throws Exception {
     conf.setInt(
         CommonConfigurationKeysPublic.IPC_CLIENT_CONNECTION_MAXIDLETIME_KEY,
         0);
-    conf.setBoolean(DFSConfigKeys.DFS_PERSIST_BLOCKS_KEY, true);
     MiniDFSCluster cluster = null;
 
     long len = 0;
@@ -157,7 +156,6 @@ public void testRestartDfsWithAbandonedBlock() throws Exception {
     conf.setInt(
         CommonConfigurationKeysPublic.IPC_CLIENT_CONNECTION_MAXIDLETIME_KEY,
         0);
-    conf.setBoolean(DFSConfigKeys.DFS_PERSIST_BLOCKS_KEY, true);
     MiniDFSCluster cluster = null;
 
     long len = 0;
@@ -219,7 +217,6 @@ public void testRestartWithPartialBlockHflushed() throws IOException {
     conf.setInt(
         CommonConfigurationKeysPublic.IPC_CLIENT_CONNECTION_MAXIDLETIME_KEY,
         0);
-    conf.setBoolean(DFSConfigKeys.DFS_PERSIST_BLOCKS_KEY, true);
     MiniDFSCluster cluster = null;
 
     FSDataOutputStream stream;
@@ -269,7 +266,6 @@ public void testRestartWithAppend() throws IOException {
     conf.setInt(
         CommonConfigurationKeysPublic.IPC_CLIENT_CONNECTION_MAXIDLETIME_KEY,
         0);
-    conf.setBoolean(DFSConfigKeys.DFS_PERSIST_BLOCKS_KEY, true);
     MiniDFSCluster cluster = null;
 
     FSDataOutputStream stream;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestBackupNode.java

@@ -434,7 +434,6 @@ void testCheckpoint(StartupOption op) throws Exception {
   public void testCanReadData() throws IOException {
     Path file1 = new Path("/fileToRead.dat");
     Configuration conf = new HdfsConfiguration();
-    conf.setBoolean(DFSConfigKeys.DFS_PERSIST_BLOCKS_KEY, true);
     MiniDFSCluster cluster = null;
     FileSystem fileSys = null;
     BackupNode backup = null;