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https://issues.apache.org/jira/browse/HBASE-9307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13748916#comment-13748916
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stack commented on HBASE-9307:
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You think this needs a test JD? Would it be hard to make one?
> HalfStoreFileReader needs to handle the faked key else compactions go into
> infinite loops
> -----------------------------------------------------------------------------------------
>
> Key: HBASE-9307
> URL: https://issues.apache.org/jira/browse/HBASE-9307
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.95.2
> Reporter: Jean-Daniel Cryans
> Assignee: Jean-Daniel Cryans
> Priority: Critical
> Fix For: 0.98.0, 0.96.0
>
> Attachments: HBASE-9307.patch
>
>
> I found this while trying out 0.95.2
> I couldn't shut my cluster down because one region was still compacting, but
> it already had been doing that for an hour and it only had 80MBs of data.
> Debugging I saw that it was a post-split compaction, specifically for the top
> part of the HFiles, and that it was just spinning on the first entry in the
> file.
> Eventually I saw that the anonymous HFileScanner inside
> HalfStoreFileReader.getScanner (that's so dirty) wasn't handling
> HConstants.INDEX_KEY_MAGIC in seekTo() when calling this:
> bq. this.delegate.seekTo(splitkey)
> Instead it would treat this as if the split key wasn't in the file, but still
> seek back to the beginning of the file *then read on from there*.
> During the compaction it would see a KV that's not even part of the region,
> and it just tries to find the correct block over and over again.
> This came from HBASE-7845.
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