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https://issues.apache.org/jira/browse/HBASE-14404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14907394#comment-14907394
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Liu Shaohui commented on HBASE-14404:
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Thanks [~apurtell].
It's a very nice feature to have in 0.98.
> Backport HBASE-14098 (Allow dropping caches behind compactions) to 0.98
> -----------------------------------------------------------------------
>
> Key: HBASE-14404
> URL: https://issues.apache.org/jira/browse/HBASE-14404
> Project: HBase
> Issue Type: Task
> Reporter: Andrew Purtell
> Assignee: Liu Shaohui
> Fix For: 0.98.15
>
> Attachments: HBASE-14404-0.98-v3.patch, HBASE-14404-0.98.patch,
> HBASE-14404-0.98.patch, v3-v2.diff
>
>
> 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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