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https://issues.apache.org/jira/browse/HDFS-16043?focusedWorklogId=655208&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-655208
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ASF GitHub Bot logged work on HDFS-16043:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Sep/21 03:02
Start Date: 26/Sep/21 03:02
Worklog Time Spent: 10m
Work Description: zhuxiangyi commented on a change in pull request #3063:
URL: https://github.com/apache/hadoop/pull/3063#discussion_r716130322
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
##########
@@ -725,6 +743,9 @@ public void activate(Configuration conf, long blockTotal) {
datanodeManager.activate(conf);
this.redundancyThread.setName("RedundancyMonitor");
this.redundancyThread.start();
+ this.markedDeleteBlockScrubberThread.
+ setName("MarkedDeleteBlockScrubberThread");
+ this.markedDeleteBlockScrubberThread.start();
Review comment:
Correct, both active nn and standby will run it.
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Issue Time Tracking
-------------------
Worklog Id: (was: 655208)
Time Spent: 4h 10m (was: 4h)
> HDFS : Delete performance optimization
> --------------------------------------
>
> 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: 4h 10m
> 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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