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https://issues.apache.org/jira/browse/HBASE-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976153#action_12976153
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Todd Lipcon commented on HBASE-3404:
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I thought we had decided at some point that this ordering didn't matter
anymore? If so, could we sort the storefiles by size before deciding which
files to compact?
> Compaction Ordering for Bulk Import Files
> -----------------------------------------
>
> Key: HBASE-3404
> URL: https://issues.apache.org/jira/browse/HBASE-3404
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.90.0, 0.90.1, 0.92.0
> Reporter: Nicolas Spiegelberg
> Assignee: Nicolas Spiegelberg
>
> We got into an issue today where we were using HFileOutputFormat to perform
> an incremental load on an already-large cluster. Because bulk-loaded files
> don't have a sequence ID, they are put in the front of the StoreFile list.
> This resulted in the following StoreFile ordering
> 2GB (bulk) => 25GB => 2GB => ...
> So this triggered a 30+GB major compaction for every single region.
> Optimally, we would like bulk import files to be ordered in the compaction
> list at the time of insertion so this can be a much smaller compaction and
> rely on StoreFile age for major compaction trigger.
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