[jira] Resolved: (HBASE-3418) Increment operations can break when qualifiers are split between memstore/snapshot and storefiles

["Jonathan Gray (JIRA)" <ji...@apache.org>]

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

Jonathan Gray resolved HBASE-3418.
----------------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

Committed to branch and trunk.  Thanks for review Stack.

> 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: 0.90.0, 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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