[jira] [Created] (AMBARI-13164) RU: Knox to use versioned data dir starting in HDP 2.3.2

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

Alejandro Fernandez created AMBARI-13164:
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             Summary: RU: Knox to use versioned data dir starting in HDP 2.3.2
                 Key: AMBARI-13164
                 URL: https://issues.apache.org/jira/browse/AMBARI-13164
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
    Affects Versions: 2.1.2
            Reporter: Alejandro Fernandez
            Assignee: Alejandro Fernandez
             Fix For: 2.1.2


Starting in HDP 2.3.2.0, Knox will version its data directory.

HDP 2.3.2.0 is meant to support Debian & Ubuntu.
A customer installing HDP 2.3.2.0 would receive the following for knox:
/usr/hdp/current/knox/data is a symlink to /var/lib/knox/data_$
{version}

Hence, all of the data directories in /var/lib/knox/ would be versioned. This is because the Debian installer fails if it tries to create the /var/lib/knox/data folder and it already exists (since it belongs to a previous version); further, you would get data loss if you tried to uninstall the newer version, since it would wipe out the folder that was used by the previous version.

So the problem doesn't arise on the initial install, but rather on installing an additional version for Rolling Upgrade.

This means that any customer planning to upgrade Knox must first upgrade Ambari to 2.1.2.

There are 3 scenarios:

1. Ambari 2.1.2 with HDP 2.3.0.0:
Ambari must continue to use the non-versioned data directory.

2. Ambari 2.1.2 with HDP 2.3.2.0:
A brand new install will use the versioned data directory out-of-the-box.

3. Ambari 2.1.0 with HDP 2.3.0.0:
Technically, this allows registering bits for HDP 2.3.2.0 and performing an RU to it. However, because HDP 2.3.2.0 uses a versioned data dir, it means that any customer with Knox that plans to perform an RU must first upgrade Ambari to 2.1.2, which is equivalent to starting with case #1.

Because RU allows the following paths, 
2.3.0.0 (non-versioned data dir) -> 2.3.2.0 (versioned data dir)
2.3.2.0 (versioned data dir) -> 2.3.3.- (versioned data dir, once it is available)

It means that it must always copy any contents from 
previous_data_dir to  /usr/hdp/{new-version}/knox/data

In the case of 2.3.0.0 -> 2.3.+, previous_data_dir is /var/lib/knox/data/
In the case of 2.3.+ -> 2.3.+, previous_data_dir is /usr/hdp/{prev-version}/knox/data




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