[jira] [Updated] (HBASE-12295) Prevent block eviction under us if reads are in progress from the BBs

["ramkrishna.s.vasudevan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-12295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ramkrishna.s.vasudevan updated HBASE-12295:
-------------------------------------------
    Attachment: HBASE-12295_trunk.patch

I would this is a WIP patch. Just parking here for initial reviews. This is nothing but a portion of the patch that was posted in HBASE-11425.  The recent purge of V2 and V3 has got lot of rework in getting this part of the code ready again.  Just for review parking here.  Will work on this tomorrow to give a final patch if there are any thing left/missed out.

> 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_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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