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Hadoop, mail # user - Datanode error


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Re: Datanode error
Harsh J 2012-07-23, 14:06
Pablo,

Perhaps you've forgotten about it but you'd ask the same question last
week and you did have some responses on it. Please see your earlier
thread at http://search-hadoop.com/m/0BOOh17ugmD

On Mon, Jul 23, 2012 at 7:27 PM, Pablo Musa <[EMAIL PROTECTED]> wrote:
> Hey guys,
> I have a cluster with 11 nodes (1 NN and 10 DNs) which is running and working.
> However my datanodes keep having the same errors, over and over.
>
> I googled the problems and tried different flags (ex: -XX:MaxDirectMemorySize=2G)
> and different configs (xceivers=8192) but could not solve it.
>
> Does anyone know what is the problem and how can I solve it? (the stacktrace is at the end)
>
> I am running:
> Java 1.7
> Hadoop 0.20.2
> Hbase 0.90.6
> Zoo 3.3.5
>
> % top -> shows low load average (6% most of the time up to 60%), already considering the number of cpus
> % vmstat -> shows no swap at all
> % sar -> shows 75% idle cpu in the worst case
>
> Hope you guys can help me.
> Thanks in advance,
> Pablo
>
> 2012-07-20 00:03:44,455 INFO org.apache.hadoop.hdfs.server.datanode.DataNode.clienttrace: src: /DN01:50010, dest:
> /DN01:43516, bytes: 396288, op: HDFS_READ, cliID: DFSClient_hb_rs_DN01,60020,1342734302945_1342734303427, offset: 54956544, srvID: DS-798921853-DN01-50010-1328651609047, blockid: blk_914960691839012728_14061688, duration:
> 480061254006
> 2012-07-20 00:03:44,455 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(DN01:50010, storageID=DS-798921853-DN01-50010-1328651609047, infoPort=50075, ipcPort=50020):Got exception while serving blk_914960691839012728_14061688 to /DN01:
> java.net.SocketTimeoutException: 480000 millis timeout while waiting for channel to be ready for write. ch : java.nio.channels.SocketChannel[connected local=/DN01:50010 remote=/DN01:43516]
>         at org.apache.hadoop.net.SocketIOWithTimeout.waitForIO(SocketIOWithTimeout.java:246)
>         at org.apache.hadoop.net.SocketOutputStream.waitForWritable(SocketOutputStream.java:159)
>         at org.apache.hadoop.net.SocketOutputStream.transferToFully(SocketOutputStream.java:198)
>         at org.apache.hadoop.hdfs.server.datanode.BlockSender.sendChunks(BlockSender.java:397)
>         at org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:493)
>         at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:279)
>         at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:175)
>
> 2012-07-20 00:03:44,455 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(DN01:50010, storageID=DS-798921853-DN01-50010-1328651609047, infoPort=50075, ipcPort=50020):DataXceiver
> java.net.SocketTimeoutException: 480000 millis timeout while waiting for channel to be ready for write. ch : java.nio.channels.SocketChannel[connected local=/DN01:50010 remote=/DN01:43516]
>         at org.apache.hadoop.net.SocketIOWithTimeout.waitForIO(SocketIOWithTimeout.java:246)
>         at org.apache.hadoop.net.SocketOutputStream.waitForWritable(SocketOutputStream.java:159)
>         at org.apache.hadoop.net.SocketOutputStream.transferToFully(SocketOutputStream.java:198)
>         at org.apache.hadoop.hdfs.server.datanode.BlockSender.sendChunks(BlockSender.java:397)
>         at org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:493)
>         at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:279)
>         at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:175)
>
> 2012-07-20 00:12:11,949 INFO org.apache.hadoop.hdfs.server.datanode.DataBlockScanner: Verification succeeded for blk_4602445008578088178_5707787
> 2012-07-20 00:12:11,962 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: writeBlock blk_-8916344806514717841_14081066 received exception java.net.SocketTimeoutException: 63000 millis timeout while waiting for channel to be ready for read. ch : java.nio.channels.SocketChannel[connected local=/DN01:36634 remote=/DN03:50010]

Harsh J