[jira] [Comment Edited] (HDFS-13820) Disable CacheReplicationMonitor If No Cached Paths Exist

["Xiao Chen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-13820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16606665#comment-16606665 ] 

Xiao Chen edited comment on HDFS-13820 at 9/7/18 3:25 AM:
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Thanks Hrishikesh for revving. By 'pre-commit fix' I meant checkstyle warning from pre-commit. :)
+1 pending


was (Author: xiaochen):
Thanks Hrishikesh for revving. By pre-commit fix I meant checkstyle. :)
+1 pending

> Disable CacheReplicationMonitor If No Cached Paths Exist
> --------------------------------------------------------
>
>                 Key: HDFS-13820
>                 URL: https://issues.apache.org/jira/browse/HDFS-13820
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: caching
>    Affects Versions: 2.10.0, 3.2.0
>            Reporter: BELUGA BEHR
>            Assignee: Hrishikesh Gadre
>            Priority: Minor
>         Attachments: HDFS-13820-001.patch, HDFS-13820-002.patch
>
>
> Stating with [HDFS-6106] the loop for checking caching is set to be every 30 seconds.
> Please implement a way to disable the {{CacheReplicationMonitor}} class if there are no paths specified.  Adding the first cached path to the NameNode should kick off the {{CacheReplicationMonitor}} and when the last one is deleted, the {{CacheReplicationMonitor}} should be disabled again.
> Alternatively, provide a configuration flag to turn this feature off altogether.



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