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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11544) [Ergonomics] hbase.client.scanner.caching is dogged and will try to return batch even if it means OOME
Date Tue, 24 Mar 2015 03:47:55 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377222#comment-14377222
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Lars Hofhansl commented on HBASE-11544:
---------------------------------------

Lemme see if I can run some tests with trunk HBase. I'd run it on a local machine, while scanning
a few dozen million rows or so and then use jvisualvm or equivalent to look for object allocations.
If we create a new object per row that'd kinda go against a lot of things I had been fixing
in the past. But let's see, if it's an object per RPC, then who cares?


> [Ergonomics] hbase.client.scanner.caching is dogged and will try to return batch even
if it means OOME
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-11544
>                 URL: https://issues.apache.org/jira/browse/HBASE-11544
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: Jonathan Lawlor
>            Priority: Critical
>             Fix For: 2.0.0, 1.1.0
>
>         Attachments: HBASE-11544-branch_1_0-v1.patch, HBASE-11544-branch_1_0-v2.patch,
HBASE-11544-v1.patch, HBASE-11544-v2.patch, HBASE-11544-v3.patch, HBASE-11544-v4.patch, HBASE-11544-v5.patch,
HBASE-11544-v6.patch, HBASE-11544-v6.patch, HBASE-11544-v6.patch, HBASE-11544-v7.patch, HBASE-11544-v8-branch-1.patch,
HBASE-11544-v8.patch, gc.j.png, hits.j.png, mean.png, net.j.png
>
>
> Running some tests, I set hbase.client.scanner.caching=1000.  Dataset has large cells.
 I kept OOME'ing.
> Serverside, we should measure how much we've accumulated and return to the client whatever
we've gathered once we pass out a certain size threshold rather than keep accumulating till
we OOME.



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