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Date: Fri, 12 Jun 2015 15:59:02 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
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Message-ID: <JIRA.12749148.1413774980000.56861.1434124742201@Atlassian.JIRA>
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Subject: [jira] [Commented] (HBASE-12295) Prevent block eviction under us if
 reads are in progress from the BBs
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    [ https://issues.apache.org/jira/browse/HBASE-12295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14583605#comment-14583605 ] 

stack commented on HBASE-12295:
-------------------------------

Thanks for updating the issue w/ our off-list discussion [~anoop.hbase] and [~ram_krish]

In short, we are trying to figure how we can release the offheap blocks when done with them after sending the response.

> Prevent block eviction under us if reads are in progress from the BBs
> ---------------------------------------------------------------------
>
>                 Key: HBASE-12295
>                 URL: https://issues.apache.org/jira/browse/HBASE-12295
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver, Scanners
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0
>
>         Attachments: HBASE-12295.pdf, HBASE-12295_1.patch, HBASE-12295_1.pdf, HBASE-12295_2.patch, HBASE-12295_4.patch, HBASE-12295_trunk.patch
>
>
> While we try to serve the reads from the BBs directly from the block cache, we need to ensure that the blocks does not get evicted under us while reading.  This JIRA is to discuss and implement a strategy for the same.


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