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Posted to issues@hbase.apache.org by "jeongmin kim (JIRA)" <ji...@apache.org> on 2015/04/15 08:21:58 UTC
[jira] [Updated] (HBASE-13474) stripe compaction selection is not
working well when includeL0==true
[ https://issues.apache.org/jira/browse/HBASE-13474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
jeongmin kim updated HBASE-13474:
---------------------------------
Attachment: HBASE-13474.patch
> stripe compaction selection is not working well when includeL0==true
> --------------------------------------------------------------------
>
> Key: HBASE-13474
> URL: https://issues.apache.org/jira/browse/HBASE-13474
> Project: HBase
> Issue Type: Bug
> Components: Compaction
> Affects Versions: 1.0.1, 0.98.12
> Reporter: jeongmin kim
> Attachments: HBASE-13474.patch
>
>
> during selecting Hfiles for the Stripe Compaction,
> If includeL0==true, int minFiles set to the number of allFiles in the stripe.
> It make compaction for All of files in the stripe
> or No compaction at all (which is the problem).
> the Stripe compaction uses exploring compaction inside.
> some of HFiles in the stripe is too big, these all files are gonna never pass the ratio check
> and compaction (even minor compactions) will be cancelled almost forever.
> Flushing makes more small HFiles and no compaction happening,
> so numerous tiny HFiles are gonna file up in the stripe, and it’s going to be a problem.
> there is no such thing as major compaction in the stripe compaction.
> But we need to compact every file of the stripe to drop deletes at some point.
> IMHO there is not one stripe in the region, there are many.
> when includeL0==true, compact all HFiles in the stripe without selecting is reasonable.
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