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https://issues.apache.org/jira/browse/HDFS-16663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17570594#comment-17570594
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caozhiqiang commented on HDFS-16663:
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[~hadachi] , Thank you for your review!
> Allow block reconstruction pending timeout refreshable to increase
> decommission performance
> -------------------------------------------------------------------------------------------
>
> Key: HDFS-16663
> URL: https://issues.apache.org/jira/browse/HDFS-16663
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: ec, namenode
> Affects Versions: 3.4.0
> Reporter: caozhiqiang
> Assignee: caozhiqiang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> In HDFS-16613, increase the value of
> dfs.namenode.replication.max-streams-hard-limit would maximize the IO
> performance of the decommissioning DN, which has a lot of EC blocks. Besides
> this, we also need to decrease the value of
> dfs.namenode.reconstruction.pending.timeout-sec, default is 5 minutes, to
> shorten the interval time for checking pendingReconstructions. Or the
> decommissioning node would be idle to wait for copy tasks in most of this 5
> minutes.
> In decommission progress, we may need to reconfigure these 2 parameters
> several times. In HDFS-14560, the
> dfs.namenode.replication.max-streams-hard-limit can already be reconfigured
> dynamically without namenode restart. And the
> dfs.namenode.reconstruction.pending.timeout-sec parameter also need to be
> reconfigured dynamically.
>
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