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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2670) Reader atomicity broken in trunk and branch
Date Thu, 10 Jun 2010 22:08:13 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2670?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HBASE-2670:
-------------------------------

    Attachment: hbase-2670.txt

It turns out that the majority of this issue was that the comparator used by MemStore didn't
take into account the "memstore logical timestamp" (memstoreTS). Thus, a new writer could
overwrite older entries if it did a write in the same millisecond. A concurrent reader would
then see a partial row because the new entries would be invisible, thus "revealing" cells
with a lower "real" TS.

This patch adds two tests to TestMemStore that check for the correct behavior.

I believe there is still a separate issue with multi-row scans and updateReaders(), but I'll
open a separate JIRA with separate tests for that one.

> Reader atomicity broken in trunk and branch
> -------------------------------------------
>
>                 Key: HBASE-2670
>                 URL: https://issues.apache.org/jira/browse/HBASE-2670
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.20.5, 0.21.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>         Attachments: hbase-2670.txt
>
>
> 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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