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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14404) Backport HBASE-14098 (Allow dropping caches behind compactions) to 0.9
Date Thu, 10 Sep 2015 23:56:46 GMT
Andrew Purtell created HBASE-14404:
--------------------------------------

             Summary: Backport HBASE-14098 (Allow dropping caches behind compactions) to 0.9
                 Key: HBASE-14404
                 URL: https://issues.apache.org/jira/browse/HBASE-14404
             Project: HBase
          Issue Type: Task
            Reporter: Andrew Purtell
            Assignee: Andrew Purtell
             Fix For: 0.98.15


HBASE-14098 adds a new configuration toggle - "hbase.hfile.drop.behind.compaction" - which
if set to "true" tells compactions to drop pages from the OS blockcache after write.  It's
on by default where committed so far but a backport to 0.98 would default it to off. (The
backport would also retain compat methods to LimitedPrivate interface StoreFileScanner.) What
could make it a controversial change in 0.98 is it changes the default setting of 'hbase.regionserver.compaction.private.readers'
from "false" to "true".  I think it's fine, we use private readers in production. They're
stable and do not present perf issues.



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