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Andrew Purtell updated HBASE-2821: ---------------------------------- Attachment: HBASE-2821.patch Refreshed patch. Please let me know if you are trying this out at some point [~ndimiduk] > Keep young storefiles at lower replication > ------------------------------------------ > > Key: HBASE-2821 > URL: https://issues.apache.org/jira/browse/HBASE-2821 > Project: HBase > Issue Type: Improvement > Components: regionserver > Reporter: Todd Lipcon > Assignee: Andrew Purtell > Fix For: 2.0.0 > > Attachments: HBASE-2821.patch, HBASE-2821.patch, HBASE-2821.patch, > lifetime-distribution.png, storefile_age.pl > > > jgray and I were brainstorming some ideas about this: > In a typical heavy-write scenario, many store files do not last very long. > They're flushed and then within a small number of seconds a compaction runs > and they get deleted. For these "short lifetime" store files, it's less > likely that a failure will occur during the window in which they're valid. > So, I think we can consider some optimizations like the following: > - Flush files at replication count 2. Scan once a minute for any store files > in the region that are older than 2 minutes. If they're found, increase their > replication to 3. (alternatively, queue them to avoid scanning) > - More dangerous: flush files at replication count 1, but don't count them > when figuring log expiration. So, if they get lost, we force log splitting to > recover. > The performance gain here is that we avoid the network and disk transfer of > writing the third replica for a file that we're just about to delete anyway. -- This message was sent by Atlassian JIRA (v6.3.4#6332)