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From "Karan Mehta (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-11544) [Ergonomics] hbase.client.scanner.caching is dogged and will try to return batch even if it means OOME
Date Tue, 23 May 2017 20:43:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16020554#comment-16020554
] 

Karan Mehta edited comment on HBASE-11544 at 5/23/17 8:42 PM:
--------------------------------------------------------------

[~jonathan.lawlor]  [~stack]
Can the server return multiple partial rows?
If yes, why does client side code assume that only the last result is partial in {{ClientScanner}}
?
If not, why do we have a repeated boolean value for {{partial_flag_per_result}} in {{Client.protos}}
?


was (Author: karanmehta93):
[~jonathan.lawlor] 
Can the server return multiple partial rows?
If yes, why does client side code assume that only the last result is partial in {{ClientScanner}}
?
If not, why do we have a repeated boolean value for {{partial_flag_per_result}} in {{Client.protos}}
?

> [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, gc.j.png, 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, hits.j.png, h.png, mean.png, m.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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