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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12742) Add support for KSM --expunge command
Date Mon, 30 Oct 2017 11:27:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16224742#comment-16224742
] 

Weiwei Yang commented on HDFS-12742:
------------------------------------

Hi [~shashikant]

Sorry my earlier comment is misleading

bq. Note, this will only purge the deleted keys from KSM, leaving SCM and all actual data
on DN behind.

I meant to say this will only purge all keys from KSM, but it is not removing any data at
DN side. The actual deletions still happens in async mode so we don't know when they can be
actually deleted. My major concern was "I can't think any reason that to just purge KSM immediately
but not SCM and DN." Can you please explain the use-case?

> Add support for KSM --expunge command
> -------------------------------------
>
>                 Key: HDFS-12742
>                 URL: https://issues.apache.org/jira/browse/HDFS-12742
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: HDFS-7240
>            Reporter: Shashikant Banerjee
>            Assignee: Shashikant Banerjee
>             Fix For: HDFS-7240
>
>         Attachments: HDFS-12742-HDFS-7240.001.patch, HDFS-12742-HDFS-7240.002.patch
>
>
> KSM --expunge will delete all the data from the data nodes for all the keys in the KSM
db. 
> User will have no control over the deletion.



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