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Date: Wed, 30 Nov 2016 16:49:59 +0000 (UTC)
From: "Anoop Sam John (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-17204) Make L2 off heap cache default ON
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archived-at: Wed, 30 Nov 2016 16:50:01 -0000


    [ https://issues.apache.org/jira/browse/HBASE-17204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15709079#comment-15709079 ] 

Anoop Sam John commented on HBASE-17204:
----------------------------------------

Thanks Yu Li..  Ya same I was also thinking. Having a default value of 8GB.

> Make L2 off heap cache default ON
> ---------------------------------
>
>                 Key: HBASE-17204
>                 URL: https://issues.apache.org/jira/browse/HBASE-17204
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 2.0.0
>
>
> L2 cache can be used for data blocks.  By default it is off now. After HBASE-11425 work, L2 off heap cache can equally perform with L1 on heap cache. On heavy loaded workload, this can even out perform L1 cache.  Pls see recently published report by Alibaba.  Also this work was backported by Rocketfuel and similar perf improvement report from them too.
> Let us turn L2 off heap cache ON. As it is off heap, we can have much larger sized L2 BC.  What should be the default size?


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