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https://issues.apache.org/jira/browse/HBASE-13827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anoop Sam John updated HBASE-13827:
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Attachment: HBASE-13827.patch
> Delayed scanner close in KeyValueHeap and StoreScanner
> ------------------------------------------------------
>
> Key: HBASE-13827
> URL: https://issues.apache.org/jira/browse/HBASE-13827
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver, Scanners
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Fix For: 2.0.0
>
> Attachments: HBASE-13827.patch
>
>
> This is to support the work in HBASE-12295. We have to return the blocks when
> the close() happens on the HFileScanner. Right now close is not at all
> there. Will add. The StoreFileScanner will call it on its close().
> In KVHeap when we see one of the child scanner runs out of cells, we will
> remove them from the PriorityQueue as well as close it. Also the same kind of
> stuff in StoreScanner too. But when we want to do the return block in close()
> this kind of early close is not correct. Still there might be cells created
> out of these cached blocks.
> This Jira aims at changing these container scanners not to do early close.
> When it seems a child scanner no longer required, it will avoid using it
> completely but just wont call close(). Instead it will be added to another
> list for a delayed close and that will be closed when the container scanner
> close() happens.
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