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https://issues.apache.org/jira/browse/HADOOP-2971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12576460#action_12576460
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Raghu Angadi commented on HADOOP-2971:
--------------------------------------
I am willing to bet that for random reasons Java select() returns 0,
irrespective of timeout. So we need to keep track how long we have waited.
Oddly, when the test passes, there are no instances of these. But when the test
fails, there are lot of instances of this.
> SocketTimeoutException in unit tests
> ------------------------------------
>
> Key: HADOOP-2971
> URL: https://issues.apache.org/jira/browse/HADOOP-2971
> Project: Hadoop Core
> Issue Type: Bug
> Components: io
> Affects Versions: 0.17.0
> Reporter: Raghu Angadi
> Assignee: Raghu Angadi
>
> TestJobStatusPersistency failed and contained DataNode stacktraces similar to
> the following :
> {noformat}
> 2008-03-07 21:27:00,410 ERROR dfs.DataNode (DataNode.java:run(976)) -
> 127.0.0.1:57790:DataXceiver: java.net.SocketTimeoutException: 0 millis
> timeout while waiting for Unknown Addr (local: /127.0.0.1:57790) to be ready
> for read
> at
> org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:188)
> at
> org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:135)
> at
> org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:121)
> at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
> at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
> at java.io.DataInputStream.readInt(DataInputStream.java:370)
> at
> org.apache.hadoop.dfs.DataNode$BlockReceiver.receiveBlock(DataNode.java:2434)
> at
> org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:1170)
> at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:953)
> at java.lang.Thread.run(Thread.java:619)
> {noformat}
> This is mostly related to HADOOP-2346. The error is strange.
> socket.getRemoteSocketAddress() returned null implying this socket is not
> connected yet. But we have already read a few bytes from it!.
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