Alejandro Fernandez created AMBARI-8970:
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Summary: Custom Actions for Namenode to execute tasks by calling a
python script
Key: AMBARI-8970
URL: https://issues.apache.org/jira/browse/AMBARI-8970
Project: Ambari
Issue Type: Technical task
Components: ambari-server
Affects Versions: 2.0.0
Reporter: Alejandro Fernandez
Assignee: Alejandro Fernandez
Fix For: 2.0.0
Currently, the upgrade-2.2.xml file, which contains the Upgrade Pack, defines
the exact commands to run for the Namenode prepare and finalize steps.
The downside of having this logic in the xml file is that it makes it difficult
to maintain, and is not as powerful as being able to run the commands by using
Python and its functions. Therefore, it is preferable for the ExecuteTask to be
able to invoke a function inside a script.
The plan is for Namenode to have functions for prepare and finalize, and for
the upgrade pack to contain something like,
Masters Group,
{code}
<service name="HDFS">
<component name="NAMENODE">
<pre-upgrade>
<task xsi:type="execute" hosts="master">
<script>scripts/namenode.py</script>
<function>prepare_rolling_upgrade</function>
</task>
</pre-upgrade>
</component>
</service>
{code}
While the Cluster Group has,
{code}
<execute-stage service="HDFS" component="NAMENODE" title="Execute HDFS
Finalize">
<task xsi:type="execute" hosts="master">
<script>scripts/namenode.py</script>
<function>finalize_rolling_upgrade</function>
</task>
</execute-stage>
{code}
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