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https://issues.apache.org/jira/browse/HBASE-3320?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Gray updated HBASE-3320:
---------------------------------
Resolution: Fixed
Fix Version/s: (was: 0.92.0)
Hadoop Flags: [Reviewed]
Status: Resolved (was: Patch Available)
Committed to branch, not trunk.
> Compaction parameter minCompactSize should be configurable
> ----------------------------------------------------------
>
> Key: HBASE-3320
> URL: https://issues.apache.org/jira/browse/HBASE-3320
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.90.0, 0.92.0
> Reporter: Jonathan Gray
> Assignee: Jonathan Gray
> Priority: Critical
> Fix For: 0.90.0
>
> Attachments: HBASE-3320-v1.patch, HBASE-3320-v2.patch
>
>
> In the new compaction algorithm, there is a minCompactSize parameter which is
> used to include files in selection if they are under this size.
> Currently this is:
> {noformat}
> this.minCompactSize = this.region.memstoreFlushSize * 3 / 2; // +50% pad
> {noformat}
> In a cluster, we had high setting of flush size but were doing frequent small
> flushes because of HLog eviction. This led to pathological cases in
> compaction file selection that this algorithm is trying to avoid in the first
> place.
> Should make this configurable but the existing value should be fine for
> default in most applications.
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