. There are 0 datanode(s) running and no node(s) are excluded in this operation.
$ bin/hdfs dfs -mkdir /user
$ bin/hdfs dfs -mkdir /user/<username>
$bin/hdfs dfs -put etc/hadoop input 报如下错：
17/06/28 00:00:36 WARN hdfs.DataStreamer: DataStreamer Exception
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /user/root/input/hadoop/capacity-scheduler.xml._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running and no node(s) are excluded in this
operation.
at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1733)
at org.apache.hadoop.hdfs.server.namenode.FSDirWriteFileOp.chooseTargetForNewBlock(FSDirWriteFileOp.java:265)
vi /usr/src/hadoop/logs/hadoop-root-datanode-centos128.log 查看日志，发现clusterIDs不兼容。想到重建的原因。故想删除历史文件
2017-06-28 00:48:21,085 INFO org.apache.hadoop.hdfs.server.common.Storage: Lock on /tmp/hadoop-root/dfs/data/in_use.lock acquired by nodename 2533@centos128
2017-06-28 00:48:21,089 WARN org.apache.hadoop.hdfs.server.common.Storage: Failed to add storage directory [DISK]file:/tmp/hadoop-root/dfs/data/
java.io.IOException: Incompatible clusterIDs in /tmp/hadoop-root/dfs/data: namenode clusterID = CID-00699a28-9ec0-4301-ae92-5a04cf302565; datanode clusterID = CID-3c15bdd3-4886-41ab-a3a8-d899d0b607b9
[root@centos128 hadoop]# sbin/stop-dfs.sh 清空/tmp下相关的文件
Stopping namenodes on [localhost]
localhost: stopping namenode
localhost: no datanode to stop
Stopping secondary namenodes [0.0.0.0]
0.0.0.0: stopping secondarynamenode
[root@centos128 hadoop]# ll /tmp
total 0
drwxr-xr-x. 3 root root 20 Jun 27 23:46 hadoop
drwxr-xr-x. 4 root root 31 Jun 27 23:46 hadoop-root
drwxr-xr-x. 2 root root 6 Jun 28 00:57 hsperfdata_root
drwxr-xr-x. 3 root root 21 Jun 28 00:48 Jetty_0_0_0_0_50070_hdfs____w2cu08
drwxr-xr-x. 3 root root 21 Jun 28 00:48 Jetty_0_0_0_0_50090_secondary____y6aanv
drwxr-xr-x. 3 root root 21 Jun 27 23:01 Jetty_localhost_33451_datanode____ihzion
drwxr-xr-x. 3 root root 21 Jun 28 00:19 Jetty_localhost_34384_datanode____gijfbp
drwxr-xr-x. 3 root root 21 Jun 28 00:48 Jetty_localhost_38324_datanode____wwolqv
drwxr-xr-x. 3 root root 21 Jun 27 23:49 Jetty_localhost_40770_datanode____.cx9tc5
drwxr-xr-x. 3 root root 21 Jun 27 23:59 Jetty_localhost_43407_datanode____.hgiwfx
drwxr-xr-x. 3 root root 16 Jun 9 06:34 pip-build-hv2v27iz
drwx------. 3 root root 17 Jun 28 00:27 systemd-private-fc429f3080ff45c493f8d0afc4a92699-vmtoolsd.service-j5KhNK
[root@centos128 hadoop]# cd /tmp
[root@centos128 tmp]# rm -rf hsp* Jett* systemd* hadopp*
[root@centos128 tmp]# ll
total 0
drwxr-xr-x. 3 root root 20 Jun 27 23:46 hadoop
drwxr-xr-x. 4 root root 31 Jun 27 23:46 hadoop-root
drwxr-xr-x. 3 root root 16 Jun 9 06:34 pip-build-hv2v27iz
[root@centos128 tmp]# rm -rf hadoop*
[root@centos128 tmp]# ll
total 0
drwxr-xr-x. 3 root root 16 Jun 9 06:34 pip-build-hv2v27iz
Browse the web interface for the NameNode; by default it is available at:
NameNode - http://192.168.44.128:50070/ 发现有一个live nodes ,并且Datanode Information 有信息