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https://issues.apache.org/jira/browse/HDFS-10710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-10710:
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Summary: In BlockManager#rescanPostponedMisreplicatedBlocks(), postponed
misreplicated block counts should be retrieved with NN lock protection (was:
In BlockManager#rescanPostponedMisreplicatedBlocks(), start and end block
counts should be get with the protect with lock)
> In BlockManager#rescanPostponedMisreplicatedBlocks(), postponed misreplicated
> block counts should be retrieved with NN lock protection
> --------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-10710
> URL: https://issues.apache.org/jira/browse/HDFS-10710
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: GAO Rui
> Assignee: GAO Rui
> Attachments: HDFS-10710.1.patch
>
>
> In BlockManager#rescanPostponedMisreplicatedBlocks(), start and end block
> counts should be get with the protect with lock. Or, log records like "-1
> blocks are removed" which indicate minus blocks are removed could be
> generated.
> For example, following scenario:
> 1. thread1 run {{long startPostponedMisReplicatedBlocksCount =
> getPostponedMisreplicatedBlocksCount();}} currently
> startPostponedMisReplicatedBlocksCount get the value 20.
> 2. before thread1 run {{namesystem.writeLock();}} , thread2 increment
> postponedMisreplicatedBlocksCount by 1, so postponedMisreplicatedBlocksCount
> is 21 now.
> 3. thread1 end the iteration, but no postponed block is removed, so after run
> {{long endPostponedMisReplicatedBlocksCount =
> getPostponedMisreplicatedBlocksCount();}},
> endPostponedMisReplicatedBlocksCount get the value of 21.
> 4. thread 1 generate the log:
> {noformat}
> LOG.info("Rescan of postponedMisreplicatedBlocks completed in " +
> (Time.monotonicNow() - startTimeRescanPostponedMisReplicatedBlocks)
> +
> " msecs. " + endPostponedMisReplicatedBlocksCount +
> " blocks are left. " + (startPostponedMisReplicatedBlocksCount -
> endPostponedMisReplicatedBlocksCount) + " blocks are removed.");
> {noformat}
> Then, we'll get the log record like "-1 blocks are removed."
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