Sumit Mohanty created AMBARI-15364:
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Summary: Ability to trigger NameNode checkpoint from Ambari Web
Key: AMBARI-15364
URL: https://issues.apache.org/jira/browse/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
{code}
>> hdfs dfsadmin -safemode enter
Safe mode is ON
>> hdfs dfsadmin -saveNamespace
Save namespace successful
>> hdfs dfsadmin -safemode leave
Safe mode is OFF
{code}
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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