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https://issues.apache.org/jira/browse/HBASE-532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12587052#action_12587052
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stack commented on HBASE-532:
-----------------------------
Previous to r596835, 2007-11-20 13:53:30 -0800, HADOOP-2139 (phase 1) Increase
parallelism in region servers, we used keep an history array of snapshots.
Scanners would travel over the history array. Flushers when done would remove
a snapshot from history (but because scanners had made a shallow copy of the
history array, they'd still have hold of the history elements till scanning was
done). Let me bring back some of this -- at least the part where flusher tells
memcache it completed the flush and the memcache keeping around 'beingFlushed'
snapshot that we check when getting, and taking out scanners (will try to
reduce on some of the copying too).
> Odd interaction between HRegion.get, HRegion.deleteAll and compactions
> ----------------------------------------------------------------------
>
> Key: HBASE-532
> URL: https://issues.apache.org/jira/browse/HBASE-532
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.2.0, 0.1.1
> Reporter: Jim Kellerman
> Assignee: stack
> Fix For: 0.2.0, 0.1.2
>
>
> If you apply the patch for HBASE-483 to the 0.1 branch and comment out lines
> 309 and 315 of MetaUtils.java (which force compactions of the root and meta
> regions respectively), TestMergeTool fails. Why forcing compactions makes the
> test succeed is a mystery to me.
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