Enis Soztutar created HBASE-12562:
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Summary: 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
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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