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Posted to common-commits@hadoop.apache.org by zj...@apache.org on 2015/03/30 21:37:18 UTC
[12/20] hadoop git commit: HDFS-7742. Favoring decommissioning node
for replication can cause a block to stay underreplicated for long periods.
Contributed by Nathan Roberts.
HDFS-7742. Favoring decommissioning node for replication can cause a block to stay
underreplicated for long periods. Contributed by Nathan Roberts.
Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/040fd169
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/040fd169
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/040fd169
Branch: refs/heads/YARN-2928
Commit: 040fd169007acb6c310f317e63a50306b8b4cb49
Parents: 1bfe248
Author: Kihwal Lee <ki...@apache.org>
Authored: Mon Mar 30 10:10:11 2015 -0500
Committer: Zhijie Shen <zj...@apache.org>
Committed: Mon Mar 30 12:10:48 2015 -0700
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hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt | 3 ++
.../server/blockmanagement/BlockManager.java | 10 ++---
.../blockmanagement/TestBlockManager.java | 42 ++++++++++++++++++++
3 files changed, 50 insertions(+), 5 deletions(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/040fd169/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index f437ad8..811ee75 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -829,6 +829,9 @@ Release 2.7.0 - UNRELEASED
HDFS-7410. Support CreateFlags with append() to support hsync() for
appending streams (Vinayakumar B via Colin P. McCabe)
+ HDFS-7742. Favoring decommissioning node for replication can cause a block
+ to stay underreplicated for long periods (Nathan Roberts via kihwal)
+
OPTIMIZATIONS
HDFS-7454. Reduce memory footprint for AclEntries in NameNode.
http://git-wip-us.apache.org/repos/asf/hadoop/blob/040fd169/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
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diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
index ad40782..f6e15a3 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
@@ -1637,7 +1637,8 @@ public class BlockManager {
// If so, do not select the node as src node
if ((nodesCorrupt != null) && nodesCorrupt.contains(node))
continue;
- if(priority != UnderReplicatedBlocks.QUEUE_HIGHEST_PRIORITY
+ if(priority != UnderReplicatedBlocks.QUEUE_HIGHEST_PRIORITY
+ && !node.isDecommissionInProgress()
&& node.getNumberOfBlocksToBeReplicated() >= maxReplicationStreams)
{
continue; // already reached replication limit
@@ -1652,13 +1653,12 @@ public class BlockManager {
// never use already decommissioned nodes
if(node.isDecommissioned())
continue;
- // we prefer nodes that are in DECOMMISSION_INPROGRESS state
- if(node.isDecommissionInProgress() || srcNode == null) {
+
+ // We got this far, current node is a reasonable choice
+ if (srcNode == null) {
srcNode = node;
continue;
}
- if(srcNode.isDecommissionInProgress())
- continue;
// switch to a different node randomly
// this to prevent from deterministically selecting the same node even
// if the node failed to replicate the block on previous iterations
http://git-wip-us.apache.org/repos/asf/hadoop/blob/040fd169/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java
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diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java
index 707c780..91abb2a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java
@@ -535,6 +535,48 @@ public class TestBlockManager {
}
@Test
+ public void testFavorDecomUntilHardLimit() throws Exception {
+ bm.maxReplicationStreams = 0;
+ bm.replicationStreamsHardLimit = 1;
+
+ long blockId = 42; // arbitrary
+ Block aBlock = new Block(blockId, 0, 0);
+ List<DatanodeDescriptor> origNodes = getNodes(0, 1);
+ // Add the block to the first node.
+ addBlockOnNodes(blockId,origNodes.subList(0,1));
+ origNodes.get(0).startDecommission();
+
+ List<DatanodeDescriptor> cntNodes = new LinkedList<DatanodeDescriptor>();
+ List<DatanodeStorageInfo> liveNodes = new LinkedList<DatanodeStorageInfo>();
+
+ assertNotNull("Chooses decommissioning source node for a normal replication"
+ + " if all available source nodes have reached their replication"
+ + " limits below the hard limit.",
+ bm.chooseSourceDatanode(
+ aBlock,
+ cntNodes,
+ liveNodes,
+ new NumberReplicas(),
+ UnderReplicatedBlocks.QUEUE_UNDER_REPLICATED));
+
+
+ // Increase the replication count to test replication count > hard limit
+ DatanodeStorageInfo targets[] = { origNodes.get(1).getStorageInfos()[0] };
+ origNodes.get(0).addBlockToBeReplicated(aBlock, targets);
+
+ assertNull("Does not choose a source decommissioning node for a normal"
+ + " replication when all available nodes exceed the hard limit.",
+ bm.chooseSourceDatanode(
+ aBlock,
+ cntNodes,
+ liveNodes,
+ new NumberReplicas(),
+ UnderReplicatedBlocks.QUEUE_UNDER_REPLICATED));
+ }
+
+
+
+ @Test
public void testSafeModeIBR() throws Exception {
DatanodeDescriptor node = spy(nodes.get(0));
DatanodeStorageInfo ds = node.getStorageInfos()[0];