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https://issues.apache.org/jira/browse/HDFS-16386?focusedWorklogId=699314&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-699314
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ASF GitHub Bot logged work on HDFS-16386:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 21/Dec/21 11:45
Start Date: 21/Dec/21 11:45
Worklog Time Spent: 10m
Work Description: sodonnel commented on pull request #3806:
URL: https://github.com/apache/hadoop/pull/3806#issuecomment-998712304
This will not go onto branch-3.2 cleanly due to HADOOP-17126 (new
Preconditions class), however it is a trivial change in the import statement,
so I have went ahead and made it and committed to 3.2.3 too.
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Issue Time Tracking
-------------------
Worklog Id: (was: 699314)
Time Spent: 3h 10m (was: 3h)
> Reduce DataNode load when FsDatasetAsyncDiskService is working
> --------------------------------------------------------------
>
> Key: HDFS-16386
> URL: https://issues.apache.org/jira/browse/HDFS-16386
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.9.2
> Reporter: JiangHua Zhu
> Assignee: JiangHua Zhu
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0, 3.2.4, 3.3.3
>
> Attachments: monitor.png
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> Our DataNode node has 36 disks. When FsDatasetAsyncDiskService is working, it
> will cause a high load on the DataNode.
> Here are some monitoring related to memory:
> !monitor.png!
> Since each disk deletes the block asynchronously, and each thread allows 4
> threads to work,
> This will cause some troubles to the DataNode, such as increased cpu and
> increased memory.
> We should appropriately reduce the number of jobs of the total thread so that
> the DataNode can work better.
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