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https://issues.apache.org/jira/browse/HDFS-17904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18070803#comment-18070803
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ASF GitHub Bot commented on HDFS-17904:
---------------------------------------
CapMoon opened a new pull request, #8406:
URL: https://github.com/apache/hadoop/pull/8406
HDFS-17904. ProcessTimedOutExcessBlocks holds the BM lock for a long time
### Description of PR
Spent a significant amount of time iterating over the Map<String,
LightWeightHashSet<Block>> in ExcessRedundancyMap; the iteration should be
moved outside the lock.
<img width="3958" height="1604" alt="ProcessTimedOutExcessBlocks"
src="https://github.com/user-attachments/assets/e3b288f9-6f81-4f22-94d3-de6feef0bdff";
/>
### How was this patch tested?
This PR have be running for almost a year in real production environment.
> ProcessTimedOutExcessBlocks holds the BM lock for a long time
> -------------------------------------------------------------
>
> Key: HDFS-17904
> URL: https://issues.apache.org/jira/browse/HDFS-17904
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.4.3
> Reporter: yue.wang
> Priority: Major
> Attachments: ProcessTimedOutExcessBlocks.png
>
>
> Spent a significant amount of time iterating over the {{Map<String,
> LightWeightHashSet<Block>>}} in {{{}ExcessRedundancyMap{}}}; the iteration
> should be moved outside the lock.
> !ProcessTimedOutExcessBlocks.png|width=787,height=319!
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