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https://issues.apache.org/jira/browse/HBASE-3232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931624#action_12931624
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ryan rawson commented on HBASE-3232:
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This feels like something that should be done in co processors
> Fix KeyOnlyFilter + Add Value Length
> ------------------------------------
>
> Key: HBASE-3232
> URL: https://issues.apache.org/jira/browse/HBASE-3232
> Project: HBase
> Issue Type: Bug
> Reporter: Nicolas Spiegelberg
> Assignee: Nicolas Spiegelberg
> Priority: Blocker
> Fix For: 0.90.0
>
>
> HBASE-3211 altered filter code to mutate KeyValues. What could go wrong?
> Well, your scan could mess up because the KVHeap compare functions don't work
> properly. If we're going to soft mutate KVs in filter code, we also need to
> soft copy the KV before filtering. This was found while adding the ability
> to have KeyOnlyFilter have the option to return the Value's length. This is
> useful for grouping your reduce tasks into equal-sized blocks.
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