Oleksandr Diachenko created AMBARI-12439:
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Summary: Implement support of logical expressions in dependencies
for stack components
Key: AMBARI-12439
URL: https://issues.apache.org/jira/browse/AMBARI-12439
Project: Ambari
Issue Type: New Feature
Components: ambari-server, ambari-web, stacks
Affects Versions: 1.7.0
Reporter: Oleksandr Diachenko
Some services' components could have dependency to be collocated with at least
one component from list.
For example, component X requires DATANODE or NAMENODE to be installed on the
same host.
As for now we can define only strict dependencies to all of three components,
like this:
{code:xml}
<dependency>
<name>HDFS/DATANODE</name>
<scope>host</scope>
<auto-deploy>
<enabled>true</enabled>
</auto-deploy>
</dependency>
<dependency>
<name>HDFS/NAMENODE</name>
<scope>host</scope>
<auto-deploy>
<enabled>true</enabled>
</auto-deploy>
</dependency>
{code}
But this definition will ask user to install both components, not only one of
them.
For that sake it would be nice to support more complex definitions of
dependencies.
For example:
{code:xml}
<dependency>
<name>(HDFS/DATANODE|HDFS/NAMENODE)</name>
<scope>host</scope>
<auto-deploy>
<enabled>true</enabled>
</auto-deploy>
</dependency>
{code} - means component requires at least one of DATANODE or NAMENODE
components.
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