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From "Biju Nair (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18641) Include block content verification logic used in lruCache in bucketCache
Date Thu, 24 Aug 2017 19:00:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16140518#comment-16140518

Biju Nair commented on HBASE-18641:

Based on the comment in the code and from HBASE-8547, the need to compare cache blocks (which
is the major overhead) happens in rare cases.  Any suggestions on how to go about recreating
the scenario to quantify it? Given that this comparison was [deemed necessary|https://issues.apache.org/jira/browse/HBASE-8547?focusedCommentId=13658942&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13658942],
do we need to quantify it?

> Include block content verification logic used in lruCache in bucketCache
> ------------------------------------------------------------------------
>                 Key: HBASE-18641
>                 URL: https://issues.apache.org/jira/browse/HBASE-18641
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: Biju Nair
>            Assignee: Biju Nair
>         Attachments: HBASE-18641-WIP.PATCH
> With off-heap/bucketCache being used to cache data blocks without going through on-heap
cache, the logic used in lruCache to check the content of already cached block need to be
included in bucketCache. Please see this [discussion|https://mail-archives.apache.org/mod_mbox/hbase-dev/201708.mbox/%3cCAO40JLCnXLw3=0bbUaXdDx=w2fkLLJefVgJ6-UVJ_2JhfvOz+Q@mail.gmail.com%3e]
for details. 

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