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From "Klaus Nagel" <...@gibtsdochgar.net>
Subject fuse_dfs and iozone
Date Mon, 18 Jan 2010 01:44:25 GMT
Hi everybody - new week, new problem...hope you can help me another time...

I want to run iozone in a fuse_dfs mounted directory (command: iozone -a)
but that doesn't work. (hadoop version 0.20.1, System Debian Lenny 32Bit
with 2.6.26-2-686 kernel, only one datanode configured)


###Output from iozone:
Can not open temp file: iozone.tmp
open: Input/output error


###fuse_dfs_wrapper output in debug mode:
LOOKUP /temp/iozone.tmp
   unique: 26, error: -2 (No such file or directory), outsize: 16
unique: 27, opcode: CREATE (35), nodeid: 6, insize: 59
   NODEID: 7
   unique: 27, error: 0 (Success), outsize: 152
unique: 28, opcode: GETATTR (3), nodeid: 6, insize: 56
   unique: 28, error: 0 (Success), outsize: 112
unique: 29, opcode: SETATTR (4), nodeid: 7, insize: 128
   unique: 29, error: 0 (Success), outsize: 112
unique: 30, opcode: FLUSH (25), nodeid: 7, insize: 64
FLUSH[167051800]
   unique: 30, error: 0 (Success), outsize: 16
unique: 31, opcode: RELEASE (18), nodeid: 7, insize: 64
RELEASE[167051800] flags: 0x8001
unique: 32, opcode: UNLINK (10), nodeid: 6, insize: 51
Exception in thread "Thread-6" org.apache.hadoop.ipc.RemoteException:
java.io.IOException: Could not complete write to file /temp/iozone.tmp by
DFSClient_1838156575
        at
org.apache.hadoop.hdfs.server.namenode.NameNode.complete(NameNode.java:449)
        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.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 $Proxy0.complete(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 $Proxy0.complete(Unknown Source)
        at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.closeInternal(DFSClient.java:3226)
        at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.close(DFSClient.java:3150)
        at
org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:61)
        at
org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:86)
Call to org/apache/hadoop/fs/FSDataOutputStream::close failed!
ERROR: dfs problem - could not close file_handle(166166016) for
/temp/iozone.tmp fuse_impls_release.c:59
   unique: 31, error: 0 (Success), outsize: 16
  CREATE[167051800] flags: 0x8041 /temp/iozone.tmp
UNLINK /temp/iozone.tmp
   unique: 32, error: 0 (Success), outsize: 16


### namenodes log
2010-01-18 02:22:11,535 INFO org.apache.hadoop.hdfs.StateChange: DIR*
NameSystem.completeFile: file /temp/iozone.tmp is closed by
DFSClient_-585130158
2010-01-18 02:22:11,539 WARN org.apache.hadoop.hdfs.StateChange: DIR*
NameSystem.completeFile: failed to complete /temp/iozone.tmp because
dir.getFileBlocks() is null  and pendingFile is null
2010-01-18 02:22:11,539 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 7 on 9000, call complete(/temp/iozone.tmp, DFSClient_-585130158)
from 10.8.0.1:49371: error: java.io.IOException: Could not complete write
to file /temp/iozone.tmp by DFSClient_-585130158
java.io.IOException: Could not complete write to file /temp/iozone.tmp by
DFSClient_-585130158
        at
org.apache.hadoop.hdfs.server.namenode.NameNode.complete(NameNode.java:449)
        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.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)
2010-01-18 02:22:11,590 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.audit:
ugi=hadoop,hadoop,fuse  ip=/10.8.0.1    cmd=delete      
src=/temp/iozone.tmp    dst=null        perm=null


### nothing ist logged about that operation in the datanode

...that was quiet all - I tested it with many different iozone options,
but everytime the same result...(making a file with e.g. echo ... > file
works perfectly)

...hope someone knows about that problem...

thanks for any reply: klaus


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