hadoop hdfs 添加数据目录出错

由于原来配置的hadoop data目录快要用满了，故准备修改配置文件增加数据目录，以便扩容，但由于疏忽，把core-site.xml, hdfs-site.xml配置文件dfs.datanode.data.dir 配置项增加了配置目录，但未创建实际目录，重启datanode服务时，报如下错误：

2014-11-18 08:51:39,128 WARN org.apache.hadoop.hdfs.server.common.Util: Path /data1/cdh/data/hadoop-hdfs/data should be specified as a
URI in configuration files. Please update hdfs configuration.
2014-11-18 08:51:39,129 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for block pool Block pool <registe
ring> (Datanode Uuid unassigned) service to namenode.hadoop/192.168.136.177:9000
org.apache.hadoop.util.DiskChecker$DiskErrorException: Too many failed volumes - current valid volumes: 1, volumes configured: 2, volum
es failed: 1, volume failures tolerated: 0
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.<init>(FsDatasetImpl.java:194)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetFactory.newInstance(FsDatasetFactory.java:34)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetFactory.newInstance(FsDatasetFactory.java:30)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:936)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:895)
        at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:274)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:220)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:813)
        at java.lang.Thread.run(Thread.java:745)
2014-11-18 08:51:39,129 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Ending block pool service for: Block pool <registering> (
Datanode Uuid unassigned) service to namenode.hadoop/10.219.136.170:9000
2014-11-18 08:51:39,230 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Block pool ID needed, but service not yet registered with
NN
java.lang.Exception: trace
        at org.apache.hadoop.hdfs.server.datanode.BPOfferService.getBlockPoolId(BPOfferService.java:143)
        at org.apache.hadoop.hdfs.server.datanode.BlockPoolManager.remove(BlockPoolManager.java:91)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.shutdownBlockPool(DataNode.java:854)
        at org.apache.hadoop.hdfs.server.datanode.BPOfferService.shutdownActor(BPOfferService.java:350)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.cleanUp(BPServiceActor.java:617)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:835)
        at java.lang.Thread.run(Thread.java:745)
?error                                                                                                              
2014-11-18 08:51:06,567 INFO org.apache.hadoop.ipc.Server: IPC Server Responder: starting
2014-11-18 08:51:06,568 INFO org.apache.hadoop.ipc.Server: IPC Server listener on 50020: starting
2014-11-18 08:51:06,851 INFO org.apache.hadoop.hdfs.server.common.Storage: Data-node version: -55 and name-node layout version: -55
2014-11-18 08:51:06,954 INFO org.apache.hadoop.hdfs.server.common.Storage: Locking is disabled
2014-11-18 08:51:06,955 INFO org.apache.hadoop.hdfs.server.common.Storage: Restored 0 block files from trash.
2014-11-18 08:51:06,502 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Refresh request received for nameservices: null
2014-11-18 08:51:06,532 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Starting BPOfferServices for nameservices: <default>
2014-11-18 08:51:06,567 INFO org.apache.hadoop.ipc.Server: IPC Server Responder: starting
2014-11-18 08:51:06,568 INFO org.apache.hadoop.ipc.Server: IPC Server listener on 50020: starting
2014-11-18 08:51:06,851 INFO org.apache.hadoop.hdfs.server.common.Storage: Data-node version: -55 and name-node layout version: -55
2014-11-18 08:51:06,954 INFO org.apache.hadoop.hdfs.server.common.Storage: Locking is disabled
2014-11-18 08:51:06,955 INFO org.apache.hadoop.hdfs.server.common.Storage: Restored 0 block files from trash.
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.<init>(FsDatasetImpl.java:194)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetFactory.newInstance(FsDatasetFactory.java:34)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetFactory.newInstance(FsDatasetFactory.java:30)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:936)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:895)
java.lang.Exception: trace
        at org.apache.hadoop.hdfs.server.datanode.BPOfferService.getBlockPoolId(BPOfferService.java:143)
        at org.apache.hadoop.hdfs.server.datanode.BlockPoolManager.remove(BlockPoolManager.java:91)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.shutdownBlockPool(DataNode.java:854)
java.lang.Exception: trace
        at org.apache.hadoop.hdfs.server.datanode.BPOfferService.getBlockPoolId(BPOfferService.java:143)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.shutdownBlockPool(DataNode.java:856)
2014-11-18 08:51:09,077 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 0
2014-11-18 08:51:09,108 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down DataNode at slave1/192.168.36.20

解决方法：修改hdfs-site.xml文件中dfs.datanode.data.dir内容为如下配置方式
  <property>
    <name>dfs.datanode.data.dir</name>
    <value>
        file:///data/cdh/data/dfs/data,file:///data1/cdh/data/hadoop-hdfs/data
     </value>
    <final>true</final>
  </property>

之前是后面添加的目录配置方式没有加上file://前缀
，重启就OK