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https://issues.apache.org/jira/browse/HBASE-855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12627273#action_12627273
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stack commented on HBASE-855:
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This patch also fixes failing compaction test.
> compaction can return less versions then we should in some cases
> ----------------------------------------------------------------
>
> Key: HBASE-855
> URL: https://issues.apache.org/jira/browse/HBASE-855
> Project: Hadoop HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.2.1, 0.18.0
> Reporter: Billy Pearson
> Assignee: Billy Pearson
> Fix For: 0.2.1, 0.18.0
>
> Attachments: 855-patch.txt
>
>
> say we have a column with max version = 3 and we have 3 records
> we insert a new record with a old timestamp.
> What happeds in the compaction is the the new record with the old timestamp
> get read first and could push out some of our
> versions if the new record(s) with the old timestamp has a expired ttl.
> This happens because we track the total times we see a row/column but do not
> reduce this count if the cell is expired
> and sense we pass the cell in order of the newest HStoreFile first with the
> newest records passed might not be the newest timestamps.
> Got to wait for HBASE-834 to be committed then I can add a patch for this
> bug. will be a simple fix.
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