[jira] Commented: (HBASE-2670) Reader atomicity broken in trunk

["Todd Lipcon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-2670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12876526#action_12876526 ] 

Todd Lipcon commented on HBASE-2670:
------------------------------------

The issue is that the memstore timestamps are lost once we flush the memstore to an HFile, and we immediately change over open scanners to scan from the HFile in updateReaders()

I think the fix is one of the following:
- in updateReaders, scan ahead the memstore reader until the next row, and cache those KVs internally. Then when we hit the end of the cache, do the actual reseek in the HFile at the begining of the next row.
- in updateReaders, simply mark a flag that we need to update as soon as we hit the next row. Then do the reseek lazily in next()

> Reader atomicity broken in trunk
> --------------------------------
>
>                 Key: HBASE-2670
>                 URL: https://issues.apache.org/jira/browse/HBASE-2670
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.21.0
>            Reporter: Todd Lipcon
>            Assignee: ryan rawson
>            Priority: Blocker
>
> There appears to be a bug in HBASE-2248 as committed to trunk. See following failing test:
> http://hudson.zones.apache.org/hudson/job/HBase-TRUNK/1296/testReport/junit/org.apache.hadoop.hbase/TestAcidGuarantees/testAtomicity/
> Think this is the same bug we saw early on in 2248 in the 0.20 branch, looks like the fix didn't make it over.

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