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Posted to issues@hbase.apache.org by "Mindaugas Kairys (JIRA)" <ji...@apache.org> on 2015/10/25 12:44:27 UTC
[jira] [Commented] (HBASE-11544) [Ergonomics]
hbase.client.scanner.caching is dogged and will try to return batch even if
it means OOME
[ https://issues.apache.org/jira/browse/HBASE-11544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14973195#comment-14973195 ]
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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