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https://issues.apache.org/jira/browse/HDFS-16613?focusedWorklogId=778059&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-778059
 ]

ASF GitHub Bot logged work on HDFS-16613:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 03/Jun/22 12:22
            Start Date: 03/Jun/22 12:22
    Worklog Time Spent: 10m 
      Work Description: hadoop-yetus commented on PR #4391:
URL: https://github.com/apache/hadoop/pull/4391#issuecomment-1145908659

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
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   |||| _ Prechecks _ |
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   |||| _ trunk Compile Tests _ |
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Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1  |
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   |||| _ Patch Compile Tests _ |
   | +1 :green_heart: |  mvninstall  |   1m 23s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   1m 30s |  |  the patch passed with JDK 
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   | +1 :green_heart: |  javadoc  |   1m 29s |  |  the patch passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
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   |||| _ Other Tests _ |
   | +1 :green_heart: |  unit  | 265m 16s |  |  hadoop-hdfs in the patch 
passed.  |
   | +1 :green_heart: |  asflicense  |   0m 49s |  |  The patch does not 
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   |  |   | 378m  0s |  |  |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4391/5/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/4391 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
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   | uname | Linux 31308dc681d3 4.15.0-169-generic #177-Ubuntu SMP Thu Feb 3 
10:50:38 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux |
   | Build tool | maven |
   | Personality | dev-support/bin/hadoop.sh |
   | git revision | trunk / baa5a8530599fe344ba10aca71d3450f0d236459 |
   | Default Java | Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
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Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4391/5/testReport/ |
   | Max. process+thread count | 4037 (vs. ulimit of 5500) |
   | modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
hadoop-hdfs-project/hadoop-hdfs |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4391/5/console |
   | versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
   This message was automatically generated.
   
   




Issue Time Tracking
-------------------

            Worklog Id:     (was: 778059)
    Remaining Estimate: 0h
            Time Spent: 10m

> EC: Improve performance of decommissioning dn with many ec blocks
> -----------------------------------------------------------------
>
>                 Key: HDFS-16613
>                 URL: https://issues.apache.org/jira/browse/HDFS-16613
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ec, erasure-coding, namenode
>    Affects Versions: 3.4.0
>            Reporter: caozhiqiang
>            Assignee: caozhiqiang
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> In a hdfs cluster with a lot of EC blocks, decommission a dn is very slow. 
> The reason is unlike replication blocks can be replicated from any dn which 
> has the same block replication, the ec block have to be replicated from the 
> decommissioning dn.
> The configurations dfs.namenode.replication.max-streams and 
> dfs.namenode.replication.max-streams-hard-limit will limit the replication 
> speed, but increase these configurations will create risk to the whole 
> cluster's network. So it should add a new configuration to limit the 
> decommissioning dn, distinguished from the cluster wide max-streams limit.



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