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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18624) Added support for clearing BlockCache
Date Tue, 19 Sep 2017 06:51:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16171195#comment-16171195
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Anoop Sam John commented on HBASE-18624:
----------------------------------------

ClearRegionBlockCache  ->  RPC name gives an indication that the BC is for a region?  
May be just call it ClearBlockCache?  Any way request specifies region.
Per table clear is enough?  Need CF specific clear also?
{code}
zookeeper = new ZooKeeperWatcher(conf, ZK_IDENTIFIER_PREFIX + connection.toString(),
1490	                                       new ThrowableAbortable());
{code}
What is the need for this ZK watcher?

Pls add comments around the Admin API that this is an API for expert Admins. They should know
the impact of calling this.  We need more details in the javadoc.  


> Added support for clearing BlockCache
> -------------------------------------
>
>                 Key: HBASE-18624
>                 URL: https://issues.apache.org/jira/browse/HBASE-18624
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 2.0.0, 1.3.0
>            Reporter: Ajay Jadhav
>            Assignee: Ajay Jadhav
>             Fix For: 1.4.0
>
>         Attachments: HBASE-18624.branch-1.001.patch, HBASE-18624.master.001.patch
>
>
> Bulk loading the primary HBase cluster triggers a lot of compactions resulting in archival/
creation
> of multiple HFiles. This process will cause a lot of items to become stale in replica’s
BlockCache.
> This patch will help users to clear the block cache for a given table by either using
shell or API.



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