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https://issues.apache.org/jira/browse/HBASE-12562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Enis Soztutar updated HBASE-12562:
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Attachment: hbase-12562_v2.patch
> 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, 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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