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https://issues.apache.org/jira/browse/HDFS-16287?focusedWorklogId=673676&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-673676
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ASF GitHub Bot logged work on HDFS-16287:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 02/Nov/21 18:24
            Start Date: 02/Nov/21 18:24
    Worklog Time Spent: 10m 
      Work Description: ferhui commented on pull request #3596:
URL: https://github.com/apache/hadoop/pull/3596#issuecomment-957338822


   @haiyang1987 Thanks for contribution, some comments:
   we can change the title here and jira, If 
dfs.namenode.block-placement-policy.exclude-slow-nodes.enabled is not 
reconfigurable.
   And I will check whether 
dfs.namenode.block-placement-policy.exclude-slow-nodes.enabled is unused.


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

    Worklog Id:     (was: 673676)
    Time Spent: 2h 50m  (was: 2h 40m)

> Support to make dfs.namenode.avoid.read.slow.datanode  reconfigurable
> ---------------------------------------------------------------------
>
>                 Key: HDFS-16287
>                 URL: https://issues.apache.org/jira/browse/HDFS-16287
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Haiyang Hu
>            Assignee: Haiyang Hu
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 2h 50m
>  Remaining Estimate: 0h
>
> 1. Consider that make dfs.namenode.avoid.read.slow.datanode  reconfigurable 
> and rapid rollback in case this feature 
> [HDFS-16076|https://issues.apache.org/jira/browse/HDFS-16076] unexpected 
> things happen in production environment  
> 2.  DatanodeManager#startSlowPeerCollector by parameter 
> 'dfs.datanode.peer.stats.enabled' to control



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