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https://issues.apache.org/jira/browse/HDFS-14523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang updated HDFS-14523:
-----------------------------------
Resolution: Fixed
Fix Version/s: 3.3.0
Status: Resolved (was: Patch Available)
Pushed v1 patch to trunk. Thanks [~wuweiwei] and [~vagarychen]!
> Remove excess read lock for NetworkToplogy
> ------------------------------------------
>
> Key: HDFS-14523
> URL: https://issues.apache.org/jira/browse/HDFS-14523
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Wu Weiwei
> Assignee: Wu Weiwei
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HDFS-14523.1.patch
>
>
> getNumOfRacks() and getNumOfLeaves() are two high frequencies call methods
> for BlockPlacementPolicy, this two methods need to get NetworkTopology read
> lock, and get lock in high frequencies call methods may impact the namenode
> performance.
> This two methods get number of racks and number of leaves just for
> chooseTarget calculate, lock in these two methods cannot guarantee these two
> values will not change in the subsequent calculations.
> I think it's safe to remove the read lock from this two methods.
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