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https://issues.apache.org/jira/browse/HDFS-17458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17836192#comment-17836192
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ASF GitHub Bot commented on HDFS-17458:
---------------------------------------

hadoop-yetus commented on PR #6717:
URL: https://github.com/apache/hadoop/pull/6717#issuecomment-2049744473

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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> Remove unnecessary BP lock in ReplicaMap
> ----------------------------------------
>
>                 Key: HDFS-17458
>                 URL: https://issues.apache.org/jira/browse/HDFS-17458
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 3.4.0
>            Reporter: farmmamba
>            Assignee: farmmamba
>            Priority: Major
>              Labels: pull-request-available
>
> In HDFS-16429 we make LightWeightResizableGSet to be thread safe, and in 
> HDFS-16511  we change some methods in ReplicaMap to acquire read lock instead 
> of acquiring write lock.
> This PR try to remove unnecessary Block_Pool read lock further.
> Recently, I performed stress tests on datanodes to measure their read/write 
> operations/second.
> Before we removing some lock,  it can only achieve ~2K write ops. After 
> optimizing, it can achieve more than 5K write ops.



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