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Posted to dev@ambari.apache.org by "jun aoki (JIRA)" <ji...@apache.org> on 2015/09/17 01:13:45 UTC
[jira] [Assigned] (AMBARI-12439) Implement support of logical
expressions in dependencies for stack components
[ https://issues.apache.org/jira/browse/AMBARI-12439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
jun aoki reassigned AMBARI-12439:
---------------------------------
Assignee: jun aoki
> 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
> Assignee: jun aoki
>
> h3. Problem
> 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}
> Literally Ambari supports only AND operator.
> But this definition will ask user to install both components, not only one of them.
> h3. Proposal
> For that sake it would be nice to support more complex definitions of dependencies, OR operator as well.
> 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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