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Andrew Purtell updated HBASE-14404: ----------------------------------- Attachment: HBASE-14404-0.98.patch Updated patch that carries forward the configured HDFS setting (or its default) if the HBase level configuration parameter is unset. > 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: Andrew Purtell > Fix For: 0.98.15 > > Attachments: HBASE-14404-0.98.patch, HBASE-14404-0.98.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)