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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-3418) Increment operations can break when qualifiers are split between memstore/snapshot and storefiles
Date Wed, 05 Jan 2011 17:16:45 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Gray updated HBASE-3418:
---------------------------------

    Attachment: HBASE-3418-v1.patch

Unit test which reproduces bad behavior and small fix which seems to work / fixes test.

> Increment operations can break when qualifiers are split between memstore/snapshot and
storefiles
> -------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3418
>                 URL: https://issues.apache.org/jira/browse/HBASE-3418
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.90.0
>            Reporter: Jonathan Gray
>            Assignee: Jonathan Gray
>            Priority: Critical
>             Fix For: 0.90.1, 0.92.0
>
>         Attachments: HBASE-3418-v1.patch
>
>
> Doing investigation around some observed resetting counter behavior.
> An optimization was added to check memstore/snapshots first and then check storefiles
if not all counters were found.  However it looks like this introduced a bug when columns
for a given row/family in a single increment operation are spread across memstores and storefiles.
> The results from get operations on both memstores and storefiles are appended together
but when processed are expected to be fully sorted.  This can lead to invalid results.
> Need to sort the combined result of memstores + storefiles.

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