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From "Sumit Mohanty (JIRA)" <>
Subject [jira] [Created] (AMBARI-15364) Ability to trigger NameNode checkpoint from Ambari Web
Date Thu, 10 Mar 2016 02:19:40 GMT
Sumit Mohanty created AMBARI-15364:

             Summary: Ability to trigger NameNode checkpoint from Ambari Web
                 Key: AMBARI-15364
             Project: Ambari
          Issue Type: Bug
            Reporter: Sumit Mohanty
         Attachments: Screen Shot 2016-03-09 at 6.18.28 PM.png

Expose the checkpoint action in the UI and make it work E2E (and ability to check on progress):
Services > HDFS > Service Actions > Save Namespace

Ample documentation is available that describe checkpoint process for HDFS. Roughly, this
translate to
>> hdfs dfsadmin -safemode enter
Safe mode is ON

>> hdfs dfsadmin -saveNamespace
Save namespace successful

>> hdfs dfsadmin -safemode leave
Safe mode is OFF

One approach is to have custom commands for each operation. In general, having support to
get into and out of SAFEMODE is useful.

saveNamespace may be a long running command. Therefore custom command for this operation may
be long running and thus there is a chance of timeout or may even block execution of other
commands on the NN host. So the better approach would be to design a custom command that can
start "saveNamespace", check the status, and if needed kill the command.


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