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https://issues.apache.org/jira/browse/HDFS-16429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoqiao He resolved HDFS-16429.
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Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Resolution: Fixed
Committed to trunk. Thanks [~Aiphag0] for your contributions!
> Add DataSetLockManager to manage fine-grain locks for FsDataSetImpl
> -------------------------------------------------------------------
>
> Key: HDFS-16429
> URL: https://issues.apache.org/jira/browse/HDFS-16429
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs
> Reporter: Mingxiang Li
> Assignee: Mingxiang Li
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> 1、Use lockManager to maintain two level lock for FsDataSetImpl.
> The simple lock model like this.Parts of implemented as follows
> * As for finalizeReplica(),append(),createRbw()....First get BlockPoolLock
> read lock，and then get BlockPoolLock-volume-lock write lock.
> * As for getStoredBlock(),getMetaDataInputStream()....First get
> BlockPoolLock read lock，and the then get BlockPoolLock-volume-lock read lock.
> * As for deepCopyReplica(),getBlockReports() get the BlockPoolLock read lock.
> * As for delete hold the BlockPoolLock write lock.
> 2、Make LightWeightResizableGSet become thread safe.It not become performance
> bottleneck if we make it thread safe.We can reduce lock grain size for
> ReplicaMap when make LightWeightResizableGSet thread safe.
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