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https://issues.apache.org/jira/browse/HDFS-9205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14958761#comment-14958761
]
Hudson commented on HDFS-9205:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #535 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/535/])
HDFS-9205. Do not schedule corrupt blocks for replication. (szetszwo)
(szetszwo: rev 5411dc559d5f73e4153e76fdff94a26869c17a37)
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestReplicationPolicy.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/NumberReplicas.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestUnderReplicatedBlockQueues.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/UnderReplicatedBlocks.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DecommissionManager.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
Move HDFS-9205 to trunk in CHANGES.txt. (szetszwo: rev
a49298d585f2cbd3bb81579f6e5d0d7b69126264)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
> Do not schedule corrupt blocks for replication
> ----------------------------------------------
>
> Key: HDFS-9205
> URL: https://issues.apache.org/jira/browse/HDFS-9205
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Priority: Minor
> Fix For: 3.0.0
>
> Attachments: h9205_20151007.patch, h9205_20151007b.patch,
> h9205_20151008.patch, h9205_20151009.patch, h9205_20151009b.patch,
> h9205_20151013.patch, h9205_20151015.patch
>
>
> Corrupted blocks by definition are blocks cannot be read. As a consequence,
> they cannot be replicated. In UnderReplicatedBlocks, there is a queue for
> QUEUE_WITH_CORRUPT_BLOCKS and chooseUnderReplicatedBlocks may choose blocks
> from it. It seems that scheduling corrupted block for replication is wasting
> resource and potentially slow down replication for the higher priority blocks.
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