这种情况是不是数据倾斜呢？

Question

hadoop jar hadoop-mapreduce-examples-2.6.0-cdh5.7.0.jar pi 2 3

Number of Maps  = 2

Samples per Map = 3

org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.namenode.SafeModeException): Cannot create directory /user/liujingmao/QuasiMonteCarlo_1541980593881_1990473757/in. Name node is in safe mode.

The reported blocks 97 has reached the threshold 0.9990 of total blocks 97. The number of live datanodes 1 has reached the minimum number 0. In safe mode extension. Safe mode will be turned off automatically in 2 seconds.

Answer 1

Michael_PK 2018-11-12 08:36:19

namenode safe mode。。。。要等正常退出安全模式，才能正常使用

• 提问者 maomaoking #1

  再次执行的时候，就可以了！！！我很少遇到这种情况！！！

• Michael_PK 回复 提问者 maomaoking #2

  那是因为你hadoop肯定重启了，每次重启后都会有先进入安全模式，等一段时间后自动退出

Answer 2

Michael_PK 2018-11-12 08:35:56

namenode save mode。。。。要等正常退出安全模式，才能正常使用