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From "Jonathan Lawlor (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 Mon, 23 Mar 2015 16:24:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14376125#comment-14376125
] 

Jonathan Lawlor commented on HBASE-11544:
-----------------------------------------

[~lhofhansl] We did run some perf tests on this patch prior to committing, see stack's comment
above (search for: comment - 04/Mar/15 01:29). Seems that the general profile did not change
much. We noticed a slight increase in GC activity likely due to increased RPC and creation
of new objects and a slight increase in throughput.

> [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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