[
https://issues.apache.org/jira/browse/HDFS-14659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chen Zhang resolved HDFS-14659.
-------------------------------
Resolution: Abandoned
duplicate jira due to apache jira server error
> Refine NameSystem lock usage during processing FBR
> --------------------------------------------------
>
> Key: HDFS-14659
> URL: https://issues.apache.org/jira/browse/HDFS-14659
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.14#76016)
---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-dev-unsubscr...@hadoop.apache.org
For additional commands, e-mail: hdfs-dev-h...@hadoop.apache.org
