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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5970) callers of NetworkTopology's chooseRandom method to expect null return value
Date Wed, 19 Feb 2014 11:07:19 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du updated HDFS-5970:
-----------------------------

    Component/s:     (was: hdfs-client)
                     (was: datanode)
                 namenode

> callers of NetworkTopology's chooseRandom method to expect null return value
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-5970
>                 URL: https://issues.apache.org/jira/browse/HDFS-5970
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Yongjun Zhang
>
> Class NetworkTopology's method
>    public Node chooseRandom(String scope) 
> calls 
>    private Node chooseRandom(String scope, String excludedScope)
> which may return null value.
> Callers of this method such as BlockPlacementPolicyDefault etc need to be aware that.



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