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https://issues.apache.org/jira/browse/HDFS-14658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chen Zhang resolved HDFS-14658.
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Resolution: Abandoned
> Refine NameSystem lock usage during processing FBR
> --------------------------------------------------
>
> Key: HDFS-14658
> URL: https://issues.apache.org/jira/browse/HDFS-14658
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Chen Zhang
> Priority: Major
>
> The disk with 12TB capacity is very normal today, which means the FBR size is
> much larger than before, BlockManager holds the NameSystemLock during
> processing block report for each storage, which might take quite a long time.
> On our production environment, processing large FBR usually cause a longer
> RPC queue time, which impacts client latency, so we did some simple work on
> refining the lock usage, which improved the p99 latency significantly.
> In our solution, BlockManager release the NameSystem write lock and request
> it again for every 5000 blocks(by default) during processing FBR, with the
> fair lock, all the RPC request can be processed before BlockManager
> re-acquire the write lock.
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