Raghu et al:
I reproduced all my experiments, only this time on an EC2 node, and they all
ran successfully without incident. So I am suspecting a machine or hardware
configuration issue.
I am going to try a more controlled series of experiments this weekend on a
machine that I can let Radhu have access to if I can reproduce the issues.
More later...
Thanks for all the assistance...much appreciated.
Raghu Angadi <[EMAIL PROTECTED]> wrote:
C G,
Any specifics on how you reproduce any of these issues will be helpful.
I was able to copy a 5GB file without errors. copyFromLocal just copies
raw file content. Not sure of what '5,000,000 rows' means.
Raghu.
C G wrote:
> Further experimentation, again single node configuration on a 4way 8G machine
> w/0.14.0, trying to copyFromLocal 669M of data in 5,000,000 rows I see this
> in the namenode log:
>
> 2007-08-24 00:50:45,902 WARN org.apache.hadoop.dfs.StateChange: DIR*
> NameSystem.completeFile: failed to complete /input/t.dat because
> dir.getFileBlocks() is non-null and pendingFile is null
> 2007-08-24 00:50:48,000 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 9 on 54310, call complete(/input/t.dat, DFSClient_-2013541261) from
> XXX.XXX.XXX.XX:36470: error: java.io.IOException: Could not complete write to
> file /input/t.dat by DFSClient_-2013541261
> java.io.IOException: Could not complete write to file /input/t.dat by
> DFSClient_-2013541261
> at org.apache.hadoop.dfs.NameNode.complete(NameNode.java:359)
> 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:585)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:340)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:566)
>
> Any thoughts or help appreciated...I'm planning to build out a large grid
> running terabytes of data...assuming I can get it Hadoop to handle more than
> 500M :-(.
>
> Thanks!
>
>
> Raghu Angadi wrote:
> Regd the second problem :
>
> It is surprising that this fails repeatedly around the same place. 0.14
> does check the checksum at the datanode (0.13 did not do this check). I
> will try to reproduce this.
>
> Raghu.
>
> C G wrote:
>> Hi All:
>> Second issue is a failure on copyFromLocal with lost connections. I'm trying
>> to copy a 5.8G, 88,784,045 million row file to HDFS. It makes progress for a
>> while, but at approx 2.1 gigs copied, it dies with a repeated series of
>> errors. There is 470G free on the file system. The error is repeated several
>> times and is:
>> $ bin/hadoop dfs -copyFromLocal sample.dat /input/sample.dat
>> 07/08/23 15:58:10 WARN fs.DFSClient: Error while writing.
>> java.net.SocketException: Connection reset
>> at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:96)
>> at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
>> at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
>> at java.io.BufferedOutputStream.write(BufferedOutputStream.java:109)
>> at java.io.DataOutputStream.write(DataOutputStream.java:90)
>> at
>> org.apache.hadoop.dfs.DFSClient$DFSOutputStream.endBlock(DFSClient.java:1656)
>> at
>> org.apache.hadoop.dfs.DFSClient$DFSOutputStream.writeChunk(DFSClient.java:1610)
>> at
>> org.apache.hadoop.fs.FSOutputSummer.writeChecksumChunk(FSOutputSummer.java:140)
>> at org.apache.hadoop.fs.FSOutputSummer.write1(FSOutputSummer.java:100)
>> at org.apache.hadoop.fs.FSOutputSummer.write(FSOutputSummer.java:86)
>> at
>> org.apache.hadoop.fs.FSDataOutputStream$PositionCache.write(FSDataOutputStream.java:39)
>> at java.io.DataOutputStream.write(DataOutputStream.java:90)
>> at org.apache.hadoop.fs.FileUtil.copyContent(FileUtil.java:258)
>> at org.apache.hadoop.fs.FileUtil.copyContent(FileUtil.java:248)
>> at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:133)
>> at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:776)
>> at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:757)
>> at org.apache.hadoop.fs.FsShell.copyFromLocal(FsShell.java:116)
>> at org.apache.hadoop.fs.FsShell.run(FsShell.java:1229)
>> at org.apache.hadoop.util.ToolBase.doMain(ToolBase.java:187)
>> at org.apache.hadoop.fs.FsShell.main(FsShell.java:1342)
>>
>> The following error also appears several times in the datanode logs:
>> 2007-08-23 15:58:10,072 ERROR org.apache.hadoop.dfs.DataNode: DataXceiver:
>> java.io.IOException: Unexpected checksum mismatch while writing
>> blk_1461965301876815406 from /xxx.xxx.xxx.xx:50960
>> at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:902)
>> at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:727)
>> at java.lang.Thread.run(Thread.java:595)
>>
>>
>> Any help on these issues much appreciated.
>>
>>
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