hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-4103) Remove System.gc() call from the map-join local-task loop
Date Fri, 01 Mar 2013 22:01:12 GMT

     [ https://issues.apache.org/jira/browse/HIVE-4103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gopal V updated HIVE-4103:
--------------------------

    Attachment: HIVE-4103.patch

Remove the thread-stopping System.gc() calls from isAbort()
                
> Remove System.gc() call from the map-join local-task loop
> ---------------------------------------------------------
>
>                 Key: HIVE-4103
>                 URL: https://issues.apache.org/jira/browse/HIVE-4103
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Gopal V
>            Priority: Minor
>         Attachments: HIVE-4103.patch
>
>
> Hive's HashMapWrapper calls System.gc() twice within the HashMapWrapper::isAbort() which
produces a significant slow-down during the loop.
> {code}
> 2013-03-01 04:54:28 The gc calls took 677 ms
> 2013-03-01 04:54:28     Processing rows:        200000  Hashtable size: 199999  Memory
usage:   62955432        rate:   0.033
> 2013-03-01 04:54:31 The gc calls took 956 ms
> 2013-03-01 04:54:31     Processing rows:        300000  Hashtable size: 299999  Memory
usage:   90826656        rate:   0.048
> 2013-03-01 04:54:33 The gc calls took 967 ms
> 2013-03-01 04:54:33     Processing rows:        384160  Hashtable size: 384160  Memory
usage:   114412712       rate:   0.06
> {code}

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message