hadoop Incompatible namespaceIDs异常
在自己的虚拟机上重新编译hadoop-0.20.2-cdh3u3后启动hadoop, 发现datanode没有起来.[*]$ hadoop dfsadmin -report
[*]Configured Capacity: 0 (0 KB)
[*]Present Capacity: 0 (0 KB)
[*]DFS Remaining: 0 (0 KB)
[*]DFS Used: 0 (0 KB)
[*]DFS Used%: 锟?
[*]Under replicated blocks: 0
[*]Blocks with corrupt replicas: 0
[*]Missing blocks: 0
[*]
[*]-------------------------------------------------
[*]Datanodes available: 0 (0 total, 0 dead)
转到日志目录， 查看datanode日志,发现如下异常:
[*]2012-03-27 18:20:12,275 INFO org.apache.hadoop.security.UserGroupInformation: JAAS Configuration already set up for Hadoop, not re-installing. 2012-03-27 18:20:12,334 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Incompatible namespaceIDs in /opt/hdfs1: namenode namespaceID = 2020402075; datanode namespaceID = 728558412 at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:238) at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:153) at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:410) at org.apache.hadoop.hdfs.server.datanode.DataNode.(DataNode.java:305) at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1606) at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1546) at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1564) at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1690) at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1707)2012-03-27 18:20:12,334 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:/************************************************************ SHUTDOWN_MSG: Shutting down DataNode at localhost.localdomain/127.0.0.1 ************************************************************/
datanode下的 namespaceID与namenode的 namespaceID不一致导致
看下namenode下 VERSION
[*]$ pwd
[*]/opt/tmp/hadoop-hadoop/dfs/name/current
[*]$
[*]$ cat VERSION
[*]#Tue Mar 27 18:22:11 PDT 2012
[*]namespaceID=2020402075
[*]cTime=0
[*]storageType=NAME_NODE
[*]layoutVersion=-19
对比datanode下VERSION
[*]$ pwd
[*]/opt/hdfs1/current
[*]$ cat VERSION
[*]#Tue Mar 27 18:16:39 PDT 2012
[*]namespaceID=728558412
[*]storageID=DS-1857008061-127.0.0.1-50010-1330145936216
[*]cTime=0
[*]storageType=DATA_NODE
[*]layoutVersion=-19
编辑datanode下的VERSION,使 namespaceID 值与namenode下的值相同, 重新启动datanode
验证:
[*]$ hadoop dfsadmin -report
[*]Configured Capacity: 366965649408 (341.76 GB)
[*]Present Capacity: 334563717120 (311.59 GB)
[*]DFS Remaining: 334563618816 (311.59 GB)
[*]DFS Used: 98304 (96 KB)
[*]DFS Used%: 0%
[*]Under replicated blocks: 0
[*]Blocks with corrupt replicas: 0
[*]Missing blocks: 0
[*]
[*]-------------------------------------------------
[*]Datanodes available: 1 (1 total, 0 dead)
[*]
[*]Name: 192.168.189.128:50010
[*]Decommission Status : Normal
[*]Configured Capacity: 366965649408 (341.76 GB)
[*]DFS Used: 98304 (96 KB)
[*]Non DFS Used: 32401932288 (30.18 GB)
[*]DFS Remaining: 334563618816(311.59 GB)
[*]DFS Used%: 0%
[*]DFS Remaining%: 91.17%
[*]Last contact: Tue Mar 27 18:25:11 PDT 2012
可以看到，datanode已经起来!
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