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Posted to hdfs-issues@hadoop.apache.org by "caozhiqiang (Jira)" <ji...@apache.org> on 2022/07/19 08:34:00 UTC
[jira] [Commented] (HDFS-16663) Allow block reconstruction pending timeout refreshable to increase decommission performance
[ https://issues.apache.org/jira/browse/HDFS-16663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17568417#comment-17568417 ]
caozhiqiang commented on HDFS-16663:
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[~hadachi] [~tasanuma] , would you help to review this patch if you hive time? This is related to [HDFS-16613|https://issues.apache.org/jira/browse/HDFS-16613]. Thank you.
> 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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