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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10107) Server.getNumOpenConnections may throw NPE
Date Mon, 18 Nov 2013 21:59:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13825819#comment-13825819
] 

Kihwal Lee commented on HADOOP-10107:
-------------------------------------

{{ConnectionManager}} is not created yet when the metrics is registered. Thus the initial
call to {{getNumOpenConnections()}} will fail with a NPE. It will work from the next snapshot,
which occurs 10 seconds later.

> Server.getNumOpenConnections may throw NPE
> ------------------------------------------
>
>                 Key: HADOOP-10107
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10107
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Daryn Sharp
>
> Found this in [build #5440|https://builds.apache.org/job/PreCommit-HDFS-Build/5440/testReport/junit/org.apache.hadoop.hdfs.server.blockmanagement/TestUnderReplicatedBlocks/testSetrepIncWithUnderReplicatedBlocks/]
> Caused by: java.lang.NullPointerException
> 	at org.apache.hadoop.ipc.Server.getNumOpenConnections(Server.java:2434)
> 	at org.apache.hadoop.ipc.metrics.RpcMetrics.numOpenConnections(RpcMetrics.java:74)



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