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From "He Xiaoqiao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14560) Allow block replication parameters to be refreshable
Date Wed, 12 Jun 2019 18:02:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16862326#comment-16862326

He Xiaoqiao commented on HDFS-14560:

+1 for [^HDFS-14560.004.patch]. Thanks [~sodonnell] for your works.

> Allow block replication parameters to be refreshable
> ----------------------------------------------------
>                 Key: HDFS-14560
>                 URL: https://issues.apache.org/jira/browse/HDFS-14560
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 3.3.0
>            Reporter: Stephen O'Donnell
>            Assignee: Stephen O'Donnell
>            Priority: Major
>         Attachments: HDFS-14560.001.patch, HDFS-14560.002.patch, HDFS-14560.003.patch,
> There are 3 key parameters that control the speed of block replication across the cluster:
> {code}
> dfs.namenode.replication.max-streams
> dfs.namenode.replication.max-streams-hard-limit
> dfs.namenode.replication.work.multiplier.per.iteration
> {code}
> These are used when decomissioning nodes and when under replicated blocks are being recovered
across the cluster. There are times when it may be desirable to increase the speed of replication
and then reduce it again (eg during off peak hours) without restarting the namenode.
> Therefore it would be good to be able to reconfigure / refresh these parameters dynamically
without a namenode restart.
> This Jira is to allow these parameters to be refreshed at runtime without a restart.

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