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https://issues.apache.org/jira/browse/HDFS-16429?focusedWorklogId=710304&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-710304
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ASF GitHub Bot logged work on HDFS-16429:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 18/Jan/22 07:47
Start Date: 18/Jan/22 07:47
Worklog Time Spent: 10m
Work Description: MingXiangLi opened a new pull request #3900:
URL: https://github.com/apache/hadoop/pull/3900
this pr is sub task of the https://github.com/apache/hadoop/pull/3889
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Issue Time Tracking
-------------------
Worklog Id: (was: 710304)
Remaining Estimate: 0h
Time Spent: 10m
> Add DataSetLockManager to maintain locks for FsDataSetImpl
> ----------------------------------------------------------
>
> Key: HDFS-16429
> URL: https://issues.apache.org/jira/browse/HDFS-16429
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.2.0
> Reporter: Mingxiang Li
> Assignee: Mingxiang Li
> Priority: Major
> Fix For: 3.2.0
>
> Time Spent: 10m
> 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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