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https://issues.apache.org/jira/browse/HADOOP-3453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12600472#action_12600472
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Steve Loughran commented on HADOOP-3453:
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Hairong -is the first stack trace from a different version of the code than
SVN_HEAD? If so, is line 521 and 434 of that version what is at line 519 and
432 of SVN head?
If so, the root cause is the same: out is null.
> ipc.Client.close() throws NullPointerException
> ----------------------------------------------
>
> Key: HADOOP-3453
> URL: https://issues.apache.org/jira/browse/HADOOP-3453
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Hairong Kuang
>
> There are two possible cases that Client.close() throws NullPointerException
> - Exception in thread "IPC Client (47) connection to localhost/127.0.0.1:3070
> from tsz" java.lang.NullPointerException
> at org.apache.hadoop.ipc.Client$Connection.close(Client.java:521)
> at org.apache.hadoop.ipc.Client$Connection.run(Client.java:434)
> - Exception in thread "Thread-2" java.lang.NullPointerException
> at org.apache.hadoop.ipc.Client$Connection.close(Client.java:519)
> at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:317)
> at org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:175)
> at org.apache.hadoop.ipc.Client.getConnection(Client.java:766)
> at org.apache.hadoop.ipc.Client.call(Client.java:680)
> at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
> ...
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