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HDFS-11049. The description of dfs.block.replicator.classname is not clear. Contributed by Yiqun Lin. 

(cherry picked from commit 9c680d0b05)
This commit is contained in:
Akira Ajisaka 2016-10-27 16:30:57 +09:00
parent 7e918637de
commit 53ed19efec
1 changed files with 11 additions and 0 deletions
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hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -3153,6 +3153,17 @@
<value>org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault</value>
<description>
Class representing block placement policy for non-striped files.
There are four block placement policies currently being supported:
BlockPlacementPolicyDefault, BlockPlacementPolicyWithNodeGroup,
BlockPlacementPolicyRackFaultTolerant and BlockPlacementPolicyWithUpgradeDomain.
BlockPlacementPolicyDefault chooses the desired number of targets
for placing block replicas in a default way. BlockPlacementPolicyWithNodeGroup
places block replicas on environment with node-group layer. BlockPlacementPolicyRackFaultTolerant
places the replicas to more racks.
BlockPlacementPolicyWithUpgradeDomain places block replicas that honors upgrade domain policy.
The details of placing replicas are documented in the javadoc of the corresponding policy classes.
The default policy is BlockPlacementPolicyDefault, and the corresponding class is
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.
</description>
</property>