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From "Mindaugas Kairys (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 Sun, 25 Oct 2015 11:44:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14973195#comment-14973195
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Mindaugas Kairys commented on HBASE-11544:
------------------------------------------

I'm unable to get partial results in mapreduce mapper jobs.

I set setAllowPartialResults(true) for scan, but job still fails with OOME on large rows.

I found that a Scan copy constructor does not bring field "allowPartialResults" to a new Scan
objects and it is possibly the reason.

I have also tried to run pure Scan client which scans all rows succesfully when using setAllowPartialResults(true).
But fails if I use a Scan object constructed from a previous one by a copy constructor (new
Scan(originalScan)).

> [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: Allocation_Hot_Spots.html, HBASE-11544-addendum-v1.patch, HBASE-11544-addendum-v2.patch,
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, h.png, hits.j.png, m.png, mean.png, net.j.png, q (2).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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