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https://issues.apache.org/jira/browse/HDFS-16043?focusedWorklogId=704949&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-704949
]
ASF GitHub Bot logged work on HDFS-16043:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 07/Jan/22 08:03
Start Date: 07/Jan/22 08:03
Worklog Time Spent: 10m
Work Description: hadoop-yetus commented on pull request #3063:
URL: https://github.com/apache/hadoop/pull/3063#issuecomment-1007212105
:broken_heart: **-1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 0m 0s | | Docker mode activated. |
| -1 :x: | patch | 0m 21s | |
https://github.com/apache/hadoop/pull/3063 does not apply to trunk. Rebase
required? Wrong Branch? See
https://cwiki.apache.org/confluence/display/HADOOP/How+To+Contribute for help.
|
| Subsystem | Report/Notes |
|----------:|:-------------|
| GITHUB PR | https://github.com/apache/hadoop/pull/3063 |
| Console output |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3063/15/console |
| versions | git=2.17.1 |
| Powered by | Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org |
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Issue Time Tracking
-------------------
Worklog Id: (was: 704949)
Time Spent: 6h 50m (was: 6h 40m)
> 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
> Attachments: 20210527-after.svg, 20210527-before.svg
>
> Time Spent: 6h 50m
> 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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