Kannan Muthukkaruppan created HBASE-7011:
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Summary: log rolling and cache flushing should be able to proceed
in parallel
Key: HBASE-7011
URL: https://issues.apache.org/jira/browse/HBASE-7011
Project: HBase
Issue Type: Improvement
Reporter: Kannan Muthukkaruppan
Today, during a memstore flush (snapshot of memstore + flushing to disk), log
rolling cannot happen. This seems like a bad design, and an unnecessary
restriction.
Possible reasons cited for this in code are:
(i) maintenance of the lastSeqWritten map.
(ii) writing a "completed-cache-flush" marker into the same log before the roll.
It seems that we can implement a new design for (i) to avoid holding the lock
for the entire duration of the flush. And the motivation for (ii) is not even
clear. We should reason this out, and make sure we can relax the restriction.
[See related discussion in HBASE-6980.]
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