HDFS-8035. Move checkBlocksProperlyReplicated() in FSNamesystem to BlockManager. Contributed by Haohui Mai.

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

@@ -568,6 +568,9 @@ Release 2.7.0 - UNRELEASED
     HDFS-8008. Support client-side back off when the datanodes are congested.
     (wheat9)
 
+    HDFS-8035. Move checkBlocksProperlyReplicated() in FSNamesystem to
+    BlockManager. (wheat9)
+
   OPTIMIZATIONS
 
     HDFS-7454. Reduce memory footprint for AclEntries in NameNode.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java

@@ -3411,6 +3411,27 @@ public class BlockManager {
     }
   }
 
+  /**
+   * Check that the indicated blocks are present and
+   * replicated.
+   */
+  public boolean checkBlocksProperlyReplicated(
+      String src, BlockInfoContiguous[] blocks) {
+    for (BlockInfoContiguous b: blocks) {
+      if (!b.isComplete()) {
+        final BlockInfoContiguousUnderConstruction uc =
+            (BlockInfoContiguousUnderConstruction)b;
+        final int numNodes = b.numNodes();
+        LOG.info("BLOCK* " + b + " is not COMPLETE (ucState = "
+          + uc.getBlockUCState() + ", replication# = " + numNodes
+          + (numNodes < minReplication ? " < ": " >= ")
+          + " minimum = " + minReplication + ") in file " + src);
+        return false;
+      }
+    }
+    return true;
+  }
+
   /** 
    * @return 0 if the block is not found;
    *         otherwise, return the replication factor of the block.

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

@@ -3525,20 +3525,19 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @param targets target datanodes where replicas of the new block is placed
    * @throws QuotaExceededException If addition of block exceeds space quota
    */
-  BlockInfoContiguous saveAllocatedBlock(String src, INodesInPath inodesInPath,
+  private void saveAllocatedBlock(String src, INodesInPath inodesInPath,
       Block newBlock, DatanodeStorageInfo[] targets)
-          throws IOException {
+      throws IOException {
     assert hasWriteLock();
     BlockInfoContiguous b = dir.addBlock(src, inodesInPath, newBlock, targets);
     NameNode.stateChangeLog.info("BLOCK* allocate " + b + " for " + src);
     DatanodeStorageInfo.incrementBlocksScheduled(targets);
-    return b;
   }
 
   /**
    * Create new block with a unique block id and a new generation stamp.
    */
-  Block createNewBlock() throws IOException {
+  private Block createNewBlock() throws IOException {
     assert hasWriteLock();
     Block b = new Block(nextBlockId(), 0, 0);
     // Increment the generation stamp for every new block.
@@ -3555,50 +3554,20 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     readLock();
     try {
       if (checkall) {
-        // check all blocks of the file.
-        for (BlockInfoContiguous block: v.getBlocks()) {
-          if (!isCompleteBlock(src, block, blockManager.minReplication)) {
-            return false;
-          }
-        }
+        return blockManager.checkBlocksProperlyReplicated(src, v
+            .getBlocks());
       } else {
         // check the penultimate block of this file
         BlockInfoContiguous b = v.getPenultimateBlock();
-        if (b != null
-            && !isCompleteBlock(src, b, blockManager.minReplication)) {
-          return false;
-        }
+        return b == null ||
+            blockManager.checkBlocksProperlyReplicated(
+                src, new BlockInfoContiguous[] { b });
       }
-      return true;
     } finally {
       readUnlock();
     }
   }
 
-  private static boolean isCompleteBlock(String src, BlockInfoContiguous b, int minRepl) {
-    if (!b.isComplete()) {
-      final BlockInfoContiguousUnderConstruction uc = (BlockInfoContiguousUnderConstruction)b;
-      final int numNodes = b.numNodes();
-      LOG.info("BLOCK* " + b + " is not COMPLETE (ucState = "
-          + uc.getBlockUCState() + ", replication# = " + numNodes
-          + (numNodes < minRepl? " < ": " >= ")
-          + " minimum = " + minRepl + ") in file " + src);
-      return false;
-    }
-    return true;
-  }
-
-  ////////////////////////////////////////////////////////////////
-  // Here's how to handle block-copy failure during client write:
-  // -- As usual, the client's write should result in a streaming
-  // backup write to a k-machine sequence.
-  // -- If one of the backup machines fails, no worries.  Fail silently.
-  // -- Before client is allowed to close and finalize file, make sure
-  // that the blocks are backed up.  Namenode may have to issue specific backup
-  // commands to make up for earlier datanode failures.  Once all copies
-  // are made, edit namespace and return to client.
-  ////////////////////////////////////////////////////////////////
-
   /**
    * Change the indicated filename. 
    * @deprecated Use {@link #renameTo(String, String, boolean,