Hadoop新部署一个节点。部署完毕后，启动datanode,没起来,错误如下：
STARTUP_MSG: Starting DataNode STARTUP_MSG: host = node-128-99/192.168.1.99 STARTUP_MSG: args = [] STARTUP_MSG: version = 1.1.2 STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.1 -r 1440782; compiled by 'hortonfo' on Thu Jan 31 02:06:43 UTC 2013 ************************************************************/ 2013-12-06 17:19:20,492 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties 2013-12-06 17:19:20,508 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered. 2013-12-06 17:19:20,509 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s). 2013-12-06 17:19:20,509 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started 2013-12-06 17:19:20,670 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered. 2013-12-06 17:19:20,736 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Invalid directory in dfs.data.dir: can not create directory: /opt/dfs/data 2013-12-06 17:19:22,183 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: org.apache.hadoop.util.DiskChecker$DiskErrorException: Invalid value for volsFailed : 1 , Volumes tolerated : 0 at org.apache.hadoop.hdfs.server.datanode.FSDataset.<init>(FSDataset.java:974) at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:403) at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:309) at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1651) at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1590) at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1608) at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1734) at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1751)
2013-12-06 17:19:22,184 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
发现是一个目录权限问题。
mkdir /opt/dfs/ chown -R hdfs:hadoop /opt/dfs/
搞定。
