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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-12295) Prevent block eviction under us if reads are in progress from the BBs
Date Wed, 17 Jun 2015 12:32:02 GMT

     [ 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_5.pdf

Updated doc 
the difference between the previous doc is that here it considers only MemoryType and there
is no cacheType. 
The non-java clients can also work with the callback way without doing any copy.  The Hregion
API needed for getScanner() will not be needed.

> 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_4.pdf, HBASE-12295_5.pdf, 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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