Andrew Purtell created HBASE-14404:
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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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