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https://issues.apache.org/jira/browse/HDFS-15375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17124099#comment-17124099
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Surendra Singh Lilhore commented on HDFS-15375:
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Triggered one build to check the impact of this patch.
> Reconstruction Work should not happen for Corrupt Block
> -------------------------------------------------------
>
> Key: HDFS-15375
> URL: https://issues.apache.org/jira/browse/HDFS-15375
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: hemanthboyina
> Assignee: hemanthboyina
> Priority: Major
> Attachments: HDFS-15375-testrepro.patch, HDFS-15375.001.patch
>
>
> In BlockManager#updateNeededReconstructions , while updating the
> NeededReconstruction we are adding Pendingreconstruction blocks to live
> replicas
> {code:java}
> int pendingNum = pendingReconstruction.getNumReplicas(block);
> int curExpectedReplicas = getExpectedRedundancyNum(block);
> if (!hasEnoughEffectiveReplicas(block, repl, pendingNum)) {
> neededReconstruction.update(block, repl.liveReplicas() +
> pendingNum,{code}
> But if two replicas were in pending reconstruction (due to corruption) , and
> if the third replica is corrupted the block should be in
> QUEUE_WITH_CORRUPT_BLOCKS but because of above logic it was getting added in
> QUEUE_LOW_REDUNDANCY , this makes the RedudancyMonitor to reconstruct a
> corrupted block , which is wrong
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