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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9943) Support reconfiguring namenode replication confs
Date Fri, 22 Apr 2016 19:55:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15254545#comment-15254545
] 

Arpit Agarwal commented on HDFS-9943:
-------------------------------------

Thanks for the patch [~xiaobingo]. 
# reconfReplicationMultiplier - this function doesn't seem to be doing anything with the new
Value. 
# getParamEffectiveVal - Let's rename this to getParameterEffectiveValue and please add javadoc.

We may be overusing 'volatile' as we make more configuration parameters reconfigurable. Can
you check to see whether any of the newly reconfigurable values are consumed within existing
locks? If so can we document that and have the reconfiguration of that property get the same
lock?

> Support reconfiguring namenode replication confs
> ------------------------------------------------
>
>                 Key: HDFS-9943
>                 URL: https://issues.apache.org/jira/browse/HDFS-9943
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Xiaobing Zhou
>         Attachments: HDFS-9943-HDFS-9000.000.patch, HDFS-9943-HDFS-9000.001.patch, HDFS-9943-HDFS-9000.002.patch,
HDFS-9943-HDFS-9000.003.patch
>
>
> The following confs should be re-configurable in runtime.
> - dfs.namenode.replication.work.multiplier.per.iteration
> - dfs.namenode.replication.interval
> - dfs.namenode.replication.max-streams
> - dfs.namenode.replication.max-streams-hard-limit



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