NPE in BlockReceiver$PacketResponder.run(BlockReceiver.java:923)
----------------------------------------------------------------
Key: HDFS-720
URL: https://issues.apache.org/jira/browse/HDFS-720
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 0.21.0
Environment: Current branch-0.21 of hdfs, mapreduce, and common. Here
is svn info:
URL: https://svn.apache.org/repos/asf/hadoop/hdfs/branches/branch-0.21
Repository Root: https://svn.apache.org/repos/asf
Repository UUID: 13f79535-47bb-0310-9956-ffa450edef68
Revision: 827883
Node Kind: directory
Schedule: normal
Last Changed Author: szetszwo
Last Changed Rev: 826906
Last Changed Date: 2009-10-20 00:16:25 +0000 (Tue, 20 Oct 2009)
Reporter: stack
Running some loadings on hdfs I had one of these on the DN XX.XX.XX.139:51010:
{code}
2009-10-21 04:57:02,755 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
Receiving block blk_6345892463926159834_1029 src: /XX,XX,XX.140:37890 dest:
/XX.XX.XX.139:51010
2009-10-21 04:57:02,829 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
PacketResponder blk_6345892463926159834_1029 1 Exception
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver$PacketResponder.run(BlockReceiver.java:923)
at java.lang.Thread.run(Thread.java:619)
{code}
On XX,XX,XX.140 side, it looks like this:
{code}
10-21 04:57:01,866 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
Receiving block blk_6345892463926159834_1029 src: /XX.XX.XX.140:37385 dest:
/XX.XX.XX140:51010
2009-10-21 04:57:02,836 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
PacketResponder 2 for block blk_6345892463926159834_1029 terminating
2009-10-21 04:57:02,885 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
DatanodeRegistration(XX.XX.XX.140:51010,
storageID=DS-1292310101-208.76.44.140-51010-1256100924816, infoPort=51075,
ipcPort=51020):Exception writing block blk_6345892463926159834_1029 to mirror
XX.XX.XX.139:51010
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcher.write0(Native Method)
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:29)
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:104)
at sun.nio.ch.IOUtil.write(IOUtil.java:75)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:334)
at
org.apache.hadoop.net.SocketOutputStream$Writer.performIO(SocketOutputStream.java:55)
at
org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:142)
at
org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:146)
at
org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:107)
at java.io.BufferedOutputStream.write(BufferedOutputStream.java:105)
at java.io.DataOutputStream.write(DataOutputStream.java:90)
at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:466)
at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:434)
at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:573)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.opWriteBlock(DataXceiver.java:352)
at
org.apache.hadoop.hdfs.protocol.DataTransferProtocol$Receiver.opWriteBlock(DataTransferProtocol.java:382)
at
org.apache.hadoop.hdfs.protocol.DataTransferProtocol$Receiver.processOp(DataTransferProtocol.java:323)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:111)
at java.lang.Thread.run(Thread.java:619)
{code}
Here is the bit of code inside the run method:
{code}
922 pkt = ackQueue.getFirst();
923 expected = pkt.seqno;
{code}
So 'pkt' is null? But LinkedList API says that it throws
NoSuchElementException if list is empty so you'd think we wouldn't get a NPE
here. What am I missing?
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