2014-08-25 15:35:05,691 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(10.130.136.136:50010, storageID=DS-1533727399-10.130.136.136-50010-1388038551296, 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=/10.130.136.136:50010 remote=/10.130.136.136:34264]

        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:392)

        at org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:490)

        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:202)

        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:104)

        at java.lang.Thread.run(Thread.java:724)

2014-08-25 15:35:06,464 INFO org.apache.hadoop.hdfs.server.datanode.DataNode.clienttrace: src: /10.130.136.136:37121, dest: /10.130.136.136:50010, bytes: 67108864, op: HDFS_WRITE, cliID: DFSClient_hb_rs_xx,60020,1388115177740_1837727868_26, offset: 0, srvID: DS-1533727399-10.130.136.136-50010-1388038551296, blockid: blk_-3628597342762703578_40720686, duration: 6339411379

2014-08-25 15:35:06,464 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: PacketResponder 2 for block blk_-3628597342762703578_40720686 terminating

2014-08-25 15:35:06,465 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Receiving block blk_-7509787569548089877_40720689 src: /10.130.136.136:37142 dest: /10.130.136.136:50010

2014-08-25 15:35:06,724 INFO org.apache.hadoop.hdfs.server.datanode.DataNode.clienttrace: src: /10.130.136.136:50010, dest: /10.130.136.136:33647, bytes: 5921280, op: HDFS_READ, cliID: DFSClient_hb_rs_xx,60020,1388115177740_1837727868_26, offset: 388096, srvID: DS-1533727399-10.130.136.136-50010-1388038551296, blockid: blk_2616588945174162483_33797955, duration: 547889496646

2014-08-25 15:35:06,725 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(10.130.136.136:50010, storageID=DS-1533727399-10.130.136.136-50010-1388038551296, infoPort=50075, ipcPort=50020):Got exception while serving blk_2616588945174162483_33797955 to /10.130.136.136:

java.net.SocketTimeoutException: 480000 millis timeout while waiting for channel to be ready for write. ch : java.nio.channels.SocketChannel[connected local=/10.130.136.136:50010 remote=/10.130.136.136:33647]

        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:392)

        at org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:490)

        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:202)

        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:104)

        at java.lang.Thread.run(Thread.java:724)

2014-08-25 15:35:06,725 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(10.130.136.136:50010, storageID=DS-1533727399-10.130.136.136-50010-1388038551296, 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=/10.130.136.136:50010 remote=/10.130.136.136:33647]

        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:392)

        at org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:490)

        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:202)

        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:104)

        at java.lang.Thread.run(Thread.java:724)

 解决方法：

  <property>

    <name>dfs.socket.timeout</name>

    <value>900000</value>

  </property>

  <property>

    <name>dfs.datanode.handler.count</name>

    <value>20</value>

  </property>

  <property>

    <name>dfs.namenode.handler.count</name>

    <value>30</value>

  </property>

  <property>

    <name>dfs.datanode.socket.write.timeout</name>

    <value>10800000</value>

    <description>set to 30 minutes ,default 8 * 60 * 1000,just for 480000 millis timeout while waiting for channel to be ready for w

rite</description>

  </property>