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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3863) Use a thread-local rather than static ENCODER/DECODER variables in Text for synchronization
Date Wed, 30 Jul 2008 18:55:32 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated HADOOP-3863:
----------------------------------

    Attachment: HADOOP-3863_0_20080730.patch

Fixed Text to use ThreadLocal encoders/decoders.

> Use a thread-local rather than static ENCODER/DECODER variables in Text for synchronization
> -------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3863
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3863
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.18.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>            Priority: Critical
>             Fix For: 0.19.0
>
>         Attachments: HADOOP-3863_0_20080730.patch
>
>
> Text.{ENCODER|DECODER} are static variables which need to be synchronized in Text.{read|write}String;
given that lots of RPC code calls Text.{read|write}String the contention for this lock shows
up very significantly on large clusters.

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