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

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

     [ https://issues.apache.org/jira/browse/AMBARI-20376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antonenko Alexander updated AMBARI-20376:
-----------------------------------------
    Status: Patch Available  (was: Open)

> 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
>
>         Attachments: AMBARI-20376.patch
>
>
> 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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