Thank you Ken,
just upping the dfs.namenode.handler.count on it's own didn't
alleviate the problem, it only increased the rate of failure to more
like 90-100%, but it got me on the right track.
I then tried also increasing the dfs.datanode.handler.count and the
problem seems to have gone away completely.
I went with dfs.namenode.handler.count of 40 (default was 10) and
dfs.datanode.handler.count of 8 (default was 3), fwiw to anyone else
out there seeing this problem.
/ Oscar
>>>> yet:/test/out/dayperiod=14731/_temporary/_attempt_201005052338_0194_r_000001_0/part-00001
>>>>
>>>>
>>>> at
>>>>
>>>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1253)
>>>> at
>>>>
>>>> org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:422)
>>>> at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
>>>>
>>>>
>>>> at
>>>>
>>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>>> at java.lang.reflect.Method.invoke(Method.java:597)
>>>> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)
>>>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)
>>>>
>>>>
>>>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)
>>>> at java.security.AccessController.doPrivileged(Native Method)
>>>> at javax.security.auth.Subject.doAs(Subject.java:396)
>>>> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
>>>>
>>>>
>>>> at org.apache.hadoop.ipc.Client.call(Client.java:739)
>>>> at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)
>>>> at $Proxy1.addBlock(Unknown Source)
>>>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>>
>>>>
>>>> at
>>>>
>>>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>>> at
>>>>
>>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>>> at java.lang.reflect.Method.invoke(Method.java:597)
>>>>
>>>>
>>>> at
>>>>
>>>> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
>>>> at
>>>>
>>>> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
>>>> at $Proxy1.addBlock(Unknown Source)
>>>>
>>>>
>>>> at
>>>>
>>>> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:2904)
>>>> at
>>>>
>>>> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2786)
>>>> at
>>>>
>>>> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2076)
>>>>
>>>>
>>>> at
>>>>
>>>> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2262)
>>>>
>>>>
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