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https://issues.apache.org/jira/browse/HBASE-3418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977896#action_12977896
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stack commented on HBASE-3418:
------------------------------
+1 on patch.
> 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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