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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1062) large numbers of threads make in-memory updates slow
Date Thu, 14 Feb 2013 20:39:13 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13578652#comment-13578652
] 

Hudson commented on ACCUMULO-1062:
----------------------------------

Integrated in Accumulo-1.4.x #275 (See [https://builds.apache.org/job/Accumulo-1.4.x/275/])
    ACCUMULO-1062 2000 threads is a little too much for a unit test; merge to 1.4 branch (Revision
1446291)

     Result = SUCCESS
ecn : 
Files : 
* /accumulo/branches/1.4
* /accumulo/branches/1.4/src
* /accumulo/branches/1.4/src/core
* /accumulo/branches/1.4/src/server
* /accumulo/branches/1.4/src/server/src
* /accumulo/branches/1.4/src/server/src/test/java/org/apache/accumulo/server/tabletserver/InMemoryMapTest.java

                
> large numbers of threads make in-memory updates slow
> ----------------------------------------------------
>
>                 Key: ACCUMULO-1062
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1062
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.4.2
>         Environment: testing on large clusters
>            Reporter: Eric Newton
>            Assignee: Keith Turner
>            Priority: Critical
>             Fix For: 1.5.0, 1.4.3
>
>         Attachments: SlamTest.java
>
>
> Using hundreds of ingest programs, each running several batch writers, ingest would eventually
become slow.  Testing (attached) proved that performance fell off as the number of threads
increased.

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