[jira] [Created] (AMBARI-9485) Add more debugging information to HDFS prepare and finalize steps

["Alejandro Fernandez (JIRA)" <ji...@apache.org>]

Alejandro Fernandez created AMBARI-9485:
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             Summary: 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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