[
https://issues.apache.org/jira/browse/HDFS-14560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16861224#comment-16861224
]
He Xiaoqiao commented on HDFS-14560:
------------------------------------
another thought based on this issue: there are many parameters in
common/hdfs/yarn which could reload dynamically, for instance most `INTERVAL`
parameters, is it possible to launcher a separate thread to reload and reset
these parameters? I think it is very convenient to tune configuration online
rather than to restart process for NN especially. cc [~elgoiri],[~kihwal]
> 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
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
