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HDFS-4946. Allow preferLocalNode in BlockPlacementPolicyDefault to be configurable. Contributed by James Kinley and Nathan Roberts. 

(cherry picked from commit ba6d5ed955)
This commit is contained in:
Kihwal Lee 2016-02-18 13:27:39 -06:00
parent f864faaafa
commit b83348c2e3
4 changed files with 24 additions and 1 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -1890,6 +1890,9 @@ Release 2.7.3 - UNRELEASED
HDFS-9669. TcpPeerServer should respect ipc.server.listen.queue.size
(Elliot Clark via cmccabe)
HDFS-4946. Allow preferLocalNode in BlockPlacementPolicyDefault to be
configurable (James Kinley and Nathan Roberts via kihwal)
OPTIMIZATIONS
BUG FIXES

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
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@ -636,6 +636,9 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
"dfs.namenode.available-space-block-placement-policy.balanced-space-preference-fraction";
public static final float DFS_NAMENODE_AVAILABLE_SPACE_BLOCK_PLACEMENT_POLICY_BALANCED_SPACE_PREFERENCE_FRACTION_DEFAULT =
0.6f;
public static final String DFS_NAMENODE_BLOCKPLACEMENTPOLICY_DEFAULT_PREFER_LOCAL_NODE_KEY =
"dfs.namenode.block-placement-policy.default.prefer-local-node";
public static final boolean DFS_NAMENODE_BLOCKPLACEMENTPOLICY_DEFAULT_PREFER_LOCAL_NODE_DEFAULT = true;
public static final String DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY = "dfs.block.local-path-access.user";
public static final String DFS_DOMAIN_SOCKET_PATH_KEY =

7
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
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@ -59,7 +59,7 @@ protected StringBuilder initialValue() {
protected boolean considerLoad;
protected double considerLoadFactor;
private boolean preferLocalNode = true;
private boolean preferLocalNode;
protected NetworkTopology clusterMap;
protected Host2NodesMap host2datanodeMap;
private FSClusterStats stats;
@ -95,6 +95,11 @@ public void initialize(Configuration conf, FSClusterStats stats,
this.staleInterval = conf.getLong(
DFSConfigKeys.DFS_NAMENODE_STALE_DATANODE_INTERVAL_KEY,
DFSConfigKeys.DFS_NAMENODE_STALE_DATANODE_INTERVAL_DEFAULT);
this.preferLocalNode = conf.getBoolean(
DFSConfigKeys.
DFS_NAMENODE_BLOCKPLACEMENTPOLICY_DEFAULT_PREFER_LOCAL_NODE_KEY,
DFSConfigKeys.
DFS_NAMENODE_BLOCKPLACEMENTPOLICY_DEFAULT_PREFER_LOCAL_NODE_DEFAULT);
}
@Override

12
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -921,6 +921,18 @@
</description>
</property>
<property>
<name>dfs.namenode.block-placement-policy.default.prefer-local-node</name>
<value>true</value>
<description>Controls how the default block placement policy places
the first replica of a block. When true, it will prefer the node where
the client is running. When false, it will prefer a node in the same rack
as the client. Setting to false avoids situations where entire copies of
large files end up on a single node, thus creating hotspots.
</description>
</property>
<property>
<name>dfs.stream-buffer-size</name>
<value>4096</value>