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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12562) Handling memory pressure for secondary region replicas
Date Fri, 06 Mar 2015 02:26:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14349824#comment-14349824
] 

Enis Soztutar commented on HBASE-12562:
---------------------------------------

Something wrong with the branch pickup script it seems. 

> Handling memory pressure for secondary region replicas
> ------------------------------------------------------
>
>                 Key: HBASE-12562
>                 URL: https://issues.apache.org/jira/browse/HBASE-12562
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 2.0.0, 1.1.0
>
>         Attachments: hbase-12562_v1.patch, hbase-12562_v2.patch, hbase-12562_v2.patch
>
>
> This issue will track the implementation of how to handle the memory pressure for secondary
region replicas. Since the replicas cannot flush by themselves, the region server might get
blocked or cause extensive flushing for its primary regions. The design doc attached at HBASE-11183
contains two possible solutions that we can pursue. The first one is to not allow secondary
region replicas to not flush by themselves, but instead of needed allow them to refresh their
store files on demand (which possibly allows them to drop their memstore snapshots or memstores).
The second approach is to allow the secondaries to flush to a temporary space. 
> Both have pros and cons, but for simplicity and to not cause extra write amplification,
we have implemented the first approach. More details can be found in the design doc, but we
can also discuss other options here. 



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