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Date: Thu, 22 Sep 2016 04:59:20 +0000 (UTC)
From: "Ashish Singhi (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-16676) All RPC requests serviced by
 PriorityRpcServer in some deploys after HBASE-13375
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archived-at: Thu, 22 Sep 2016 04:59:22 -0000


    [ https://issues.apache.org/jira/browse/HBASE-16676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15512151#comment-15512151 ] 

Ashish Singhi commented on HBASE-16676:
---------------------------------------

The discussion regarding this was happened on HBASE-15315 and was decided to not commit in branch-1.2 as it will introduce a behavior change.

> All RPC requests serviced by PriorityRpcServer in some deploys after HBASE-13375
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-16676
>                 URL: https://issues.apache.org/jira/browse/HBASE-16676
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.2.0, 1.2.1, 1.2.2, 1.2.3
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>             Fix For: 1.2.4
>
>         Attachments: HBASE-16676-branch-1.2.patch
>
>
> I have been trying to track down why 1.2.x won't sometimes pass a 1 billion row ITBLL run while 0.98.22 and 1.1.6 will always, and a defeat of RPC prioritization could explain it. We get stuck during the loading phase and the loader job eventually fails. 
> All testing is done in an insecure environment under the same UNIX user (clusterdock) so effectively all ops are issued by the superuser.
> Doing unrelated work - or so I thought! - I was looking at object allocations by YCSB workload by thread and when looking at the RegionServer RPC threads noticed that for 0.98.22 and 1.1.6, as expected, the vast majority of allocations are from threads named "B.defaultRpcServer.handler*". In 1.2.0 and up, instead the vast majority are from threads named "PriorityRpcServer.handler*" with very little from threads named "B.defaultRpcServer.handler*".  A git bisect to find the change that causes this leads to HBASE-13375, and so of course this makes sense out of what I am seeing, but is this really what we want? What about production environments (insecure and degenerate secure) where all ops are effectively issued by the superuser? We run one of these at Salesforce.


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