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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11492) Hadoop configuration overrides some ipc parameters including tcpNoDelay
Date Mon, 21 Jul 2014 16:58:39 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell updated HBASE-11492:
-----------------------------------

    Attachment: 11492.098.addendum.v2.patch

Attached updated addendum for 0.98. Set the default of 'hbase.ipc.server.tcpnodelay' to 'true'
and ignore the Hadoop conf vars. We are already doing this for the client side setting.

We shouldn't amend src/main/docbkx/ on a branch. Current release practice is to copy src/main/*
from master branch back onto the branch before generating docs. Any changes on branch are
clobbered. Left that part out.

> Hadoop configuration overrides some ipc parameters including tcpNoDelay
> -----------------------------------------------------------------------
>
>                 Key: HBASE-11492
>                 URL: https://issues.apache.org/jira/browse/HBASE-11492
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.98.0, 0.99.0
>            Reporter: Nicolas Liochon
>            Assignee: Nicolas Liochon
>            Priority: Critical
>             Fix For: 0.99.0, 0.98.4, 2.0.0
>
>         Attachments: 11492.098.addendum.patch, 11492.098.addendum.v2.patch, 11492.v1.patch,
11492.v1.withp1.patch, 11492.v2-0.98.patch, 11492.v2.patch, 11492.v2.patch, 11492.v3.patch
>
>
> There is an option to set tcpNoDelay, defaulted to true, but the socket channel is actually
not changed. As a consequence, the server works with nagle enabled. This leads to very degraded
behavior when a single connection is shared between threads. We enter into conflicts with
nagle and tcp delayed ack. 
> Here is an example of performance with the PE tool plus HBASE-11491:
> {noformat}
> oneCon     #client       sleep          exeTime (seconds)                           
 avg latency, sleep excluded (microseconds)
> true           1               0                31                                  
                  310
> false          1               0                31                                  
                  310
> true           2               0                50                                  
                   500
> false          2               0               31                                   
                  310
> true           2                5               488 (including 200s sleeping)       
       2880 
> false          2               5               246  (including 200s sleeping)       
       460
> {noformat}
> The latency is multiple by 5 (2880 vs 460) when the connection is shared. This is the
delayed ack kicking in. This can be fixed by really using tcp no delay.
> Any application sharing the tcp connection between threads has the issue.



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