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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11696) Make CombinedBlockCache resizable.
Date Fri, 08 Aug 2014 06:20:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14090363#comment-14090363
] 

Anoop Sam John commented on HBASE-11696:
----------------------------------------

It depends on the auto tuner impl. The default simple one will increase size (till max size)
when there are evictions- until to reach a non evicting state. Also this it can do only when
there is very less/no write load and there are no blocking flushes due to global heap pressure.

And regarding DATA/META blocks hosting, will it be better we have separate cache parts for
META and DATA blocks? Not gone into more details in this area. 

> Make CombinedBlockCache resizable.
> ----------------------------------
>
>                 Key: HBASE-11696
>                 URL: https://issues.apache.org/jira/browse/HBASE-11696
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 2.0.0
>
>
> HBASE-5349 adds auto tuning of memstore heap and block cache heap. Block cache needs
to be resizable in order for this. CombinedBlockCache is not marked resizable now. We can
make this. On resize the L1 cache (ie. LRU cache) can get resized.



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