[jira] [Created] (AMBARI-20376) While Moving Namenode via Move Master wizard, datanodes reported as down

["Antonenko Alexander (JIRA)" <ji...@apache.org>]

Antonenko Alexander created AMBARI-20376:
--------------------------------------------

             Summary: While Moving Namenode via Move Master wizard, datanodes reported as down
                 Key: AMBARI-20376
                 URL: https://issues.apache.org/jira/browse/AMBARI-20376
             Project: Ambari
          Issue Type: Bug
          Components: ambari-web
    Affects Versions: 2.5.0
            Reporter: Antonenko Alexander
            Assignee: Antonenko Alexander
            Priority: Critical
             Fix For: 2.5.0


While Moving Namenode via Move Master wizard, datanodes reported as down while starting ATS.

Seeing this in a couple of splits today. ATS fails to start showing there are no live datanodes
{code}
{
  "RemoteException": {
    "exception": "RetriableException", 
    "javaClassName": "org.apache.hadoop.ipc.RetriableException", 
    "message": "org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot set permission for /ats/done. Name node is in safe mode.\nThe reported blocks 934 has reached the threshold 0.9900 of total blocks 934. The number of live datanodes 3 has reached the minimum number 0. In safe mode extension. Safe mode will be turned off automatically in 21 seconds."
  }
}
{code}

The step before ATS start, starts datanode explicitly. On retry ATS will possibly come up. But no retries were needed before 



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