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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10953) a minor concurrent bug inside NetworkTopology
Date Mon, 09 Feb 2015 22:05:34 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer updated HADOOP-10953:
--------------------------------------
    Status: Patch Available  (was: Open)

> a minor concurrent bug inside NetworkTopology
> ---------------------------------------------
>
>                 Key: HADOOP-10953
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10953
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: net
>    Affects Versions: 3.0.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>            Priority: Minor
>         Attachments: HADOOP-10953.txt
>
>
> Found this issue while reading the related code. In NetworkTopology.toString() method,
there is no thread safety guarantee directly, it's called by add/remove, and inside add/remove,
most of this.toString() calls are protected by rwlock, except a couple of error handling codes,
one possible fix is that moving them into lock as well, due to not heavy operations, so no
obvious downgration should be observed per my current knowledge.



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