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https://issues.apache.org/jira/browse/HDFS-16043?focusedWorklogId=708965&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-708965
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ASF GitHub Bot logged work on HDFS-16043:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 14/Jan/22 10:20
Start Date: 14/Jan/22 10:20
Worklog Time Spent: 10m
Work Description: Hexiaoqiao commented on pull request #3882:
URL: https://github.com/apache/hadoop/pull/3882#issuecomment-1012989982
> @Hexiaoqiao The build failed, doesn't seem to be related to this patch,
can you trigger Jinkens to rebuild?
Trigger again. Let's wait what it will say.
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Issue Time Tracking
-------------------
Worklog Id: (was: 708965)
Time Spent: 11h 20m (was: 11h 10m)
> Add markedDeleteBlockScrubberThread to delete blocks asynchronously
> -------------------------------------------------------------------
>
> Key: HDFS-16043
> URL: https://issues.apache.org/jira/browse/HDFS-16043
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, namanode
> Affects Versions: 3.4.0
> Reporter: Xiangyi Zhu
> Assignee: Xiangyi Zhu
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Attachments: 20210527-after.svg, 20210527-before.svg
>
> Time Spent: 11h 20m
> Remaining Estimate: 0h
>
> The deletion of the large directory caused NN to hold the lock for too long,
> which caused our NameNode to be killed by ZKFC.
> Through the flame graph, it is found that its main time-consuming
> calculation is QuotaCount when removingBlocks(toRemovedBlocks) and deleting
> inodes, and removeBlocks(toRemovedBlocks) takes a higher proportion of time.
> h3. solution:
> 1. RemoveBlocks is processed asynchronously. A thread is started in the
> BlockManager to process the deleted blocks and control the lock time.
> 2. QuotaCount calculation optimization, this is similar to the optimization
> of this Issue HDFS-16000.
> h3. Comparison before and after optimization:
> Delete 1000w Inode and 1000w block test.
> *before:*
> remove inode elapsed time: 7691 ms
> remove block elapsed time :11107 ms
> *after:*
> remove inode elapsed time: 4149 ms
> remove block elapsed time :0 ms
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