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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12976) Set default value for hbase.client.scanner.max.result.size
Date Thu, 05 Feb 2015 23:06:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14308202#comment-14308202
] 

Lars Hofhansl commented on HBASE-12976:
---------------------------------------

On second thought... We left default scanner caching set to 1 in 0.94, so this setting by
default makes not much sense.

> Set default value for hbase.client.scanner.max.result.size
> ----------------------------------------------------------
>
>                 Key: HBASE-12976
>                 URL: https://issues.apache.org/jira/browse/HBASE-12976
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 2.0.0, 1.0.1, 1.1.0, 0.98.11
>
>         Attachments: 12976-v2.txt, 12976.txt
>
>
> Setting scanner caching is somewhat of a black art. It's hard to estimate ahead of time
how large the result set will be.
> I propose we hbase.client.scanner.max.result.size to 2mb. That is good compromise between
performance and buffer usage on typical networks (avoiding OOMs when the caching was chosen
too high).
> To an HTable client this is completely transparent.



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