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https://issues.apache.org/jira/browse/AMBARI-9485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alejandro Fernandez updated AMBARI-9485:
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Summary: RU - Add more debugging information to HDFS prepare and finalize
steps (was: Add more debugging information to HDFS prepare and finalize steps)
> RU - Add more debugging information to HDFS prepare and finalize steps
> ----------------------------------------------------------------------
>
> Key: AMBARI-9485
> URL: https://issues.apache.org/jira/browse/AMBARI-9485
> Project: Ambari
> Issue Type: Task
> Components: ambari-server
> Affects Versions: 2.0.0
> Reporter: Alejandro Fernandez
> Assignee: Alejandro Fernandez
> Fix For: 2.0.0
>
>
> Add more debugging information for HDFS prepare and finalize steps.
> Prepare:
> 1. With HA setup, the current code requires the NameNode NOT in safemode when
> starting RU.
> 2. With non-HA setup, the current code requires the NameNode in safemode when
> start RU.
> The reason is that for non-HA setup, we need to do an extra checkpoint in the
> single NN (by calling saveNamespace), which requires the NN to be in safemode
> (to avoid namespace modification during the checkpoint). But for HA-setup,
> the checkpoint is done by the standby NN, thus we do not need to put the
> active NN into the safemode and in this way we can avoid service downtime.
> We need to log what the original state is.
> Finalize:
> This has a confusing message related to
> https://issues.apache.org/jira/secure/attachment/12679263/HDFS-7340.001.patch
> {code}
> [root@c6404 ~]# su - hdfs -c 'hdfs dfsadmin -rollingUpgrade query'
> QUERY rolling upgrade ...
> Proceed with rolling upgrade:
> Block Pool ID: BP-819970438-192.168.64.104-1423091248521
> Start Time: Thu Feb 05 01:15:16 UTC 2015 (=1423098916798)
> Finalize Time: <NOT FINALIZED>
> [root@c6404 ~]# su - hdfs -c 'hdfs dfsadmin -rollingUpgrade finalize'
> FINALIZE rolling upgrade ...
> There is no rolling upgrade in progress or rolling upgrade has already been
> finalized.
> [root@c6404 ~]# su - hdfs -c 'hdfs dfsadmin -rollingUpgrade query'
> QUERY rolling upgrade ...
> There is no rolling upgrade in progress or rolling upgrade has already been
> finalized.
> {code}
> This means that the finalize did happen.
> We should run another "hdfs dfsadmin -rollingUpgrade query" after finalize to
> ensure this happened.
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