使用hadoop时出现错误：hdfs.DFSClient - Exception in createBlockOutputStream 192.168.1.17:50010 java.io.IOException: Bad connect ack with firstBadLink as 192.168.1.24:50010
原因192.168.1.24机器datanode log里出现以下错误信息：
2012-11-16 07:50:06,452 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(192.168.1.24:50010, storageID=DS-1981722178-192.168.1.24-50010-1350633535171, infoPort=50075, ipcPort=50020):DataXceiver
java.io.IOException: xceiverCount 4097 exceeds the limit of concurrent xcievers 4096
解决办法, 修改conf/hdfs-site.xml里的dfs.datanode.max.xcievers配置，增大xcievers个数，如：
<property>
<name>dfs.datanode.max.xcievers</name>
<value>16000</value>
</property>