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https://issues.apache.org/jira/browse/HDFS-13614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16531968#comment-16531968
]
Wei-Chiu Chuang commented on HDFS-13614:
----------------------------------------
Here's the initial NPE I saw at Impala side:
{noformat}
I0517 21:14:24.498630 1781723 jni-util.cc:176]
org.apache.impala.common.ImpalaRuntimeException: UDF::evaluate() ran into a
problem.
at
org.apache.impala.hive.executor.UdfExecutor.evaluate(UdfExecutor.java:291)
Caused by: org.apache.impala.common.ImpalaRuntimeException: UDF failed to
evaluate
at
org.apache.impala.hive.executor.UdfExecutor.evaluate(UdfExecutor.java:361)
at
org.apache.impala.hive.executor.UdfExecutor.evaluate(UdfExecutor.java:288)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.apache.impala.hive.executor.UdfExecutor.evaluate(UdfExecutor.java:353)
... 1 more
Caused by: java.lang.NullPointerException
at java.util.LinkedList$ListItr.next(LinkedList.java:893)
at
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.trimIdleSelectors(SocketIOWithTimeout.java:447)
at
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.release(SocketIOWithTimeout.java:429)
at
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:373)
at
org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
at
org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:161)
at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.readChannelFully(PacketReceiver.java:258)
at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doReadFully(PacketReceiver.java:209)
at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doRead(PacketReceiver.java:171)
at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.receiveNextPacket(PacketReceiver.java:102)
at
org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:207)
at
org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:156)
at
org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:788)
at
org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:844)
at
org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:904)
at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:954)
...
{noformat}
> DN failed to connect with NN because of NPE in SocketIOWithTimeout
> ------------------------------------------------------------------
>
> Key: HDFS-13614
> URL: https://issues.apache.org/jira/browse/HDFS-13614
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.7.2
> Reporter: Surendra Singh Lilhore
> Priority: Major
>
> {{LinkedList$ListItr.next()}} is throwing NPE in {{SocketIOWithTimeout}}.
> Because of this socket connections are failing. It may be java bug also..
> [https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8133715]
>
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