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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