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Posted to hdfs-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2022/01/27 08:54:00 UTC
[jira] [Work logged] (HDFS-16429) Add DataSetLockManager to manage fine-grain locks for FsDataSetImpl
[ https://issues.apache.org/jira/browse/HDFS-16429?focusedWorklogId=716282&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-716282 ]
ASF GitHub Bot logged work on HDFS-16429:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 27/Jan/22 08:53
Start Date: 27/Jan/22 08:53
Worklog Time Spent: 10m
Work Description: Hexiaoqiao merged pull request #3900:
URL: https://github.com/apache/hadoop/pull/3900
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Issue Time Tracking
-------------------
Worklog Id: (was: 716282)
Time Spent: 1h 40m (was: 1.5h)
> 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
> 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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