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Junping Du commented on HDFS-5970: ---------------------------------- Nice catch, Yongjun! Would be great if you can deliver a patch with unit test. > 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. -- This message was sent by Atlassian JIRA (v6.1.5#6160)