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From "Dmytro Sen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMBARI-10316) Stack-advisor mechanism when recommending configuration-dependencies has incorrect services.json content
Date Wed, 01 Apr 2015 18:20:52 GMT
Dmytro Sen created AMBARI-10316:
-----------------------------------

             Summary: Stack-advisor mechanism when recommending configuration-dependencies
has incorrect services.json content
                 Key: AMBARI-10316
                 URL: https://issues.apache.org/jira/browse/AMBARI-10316
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server, stacks
    Affects Versions: 2.1.0
            Reporter: Dmytro Sen
            Assignee: Dmytro Sen
            Priority: Critical
             Fix For: 2.1.0


When the POST call is made for recommending {{configuration-dependencies}}, we generate the
services.json file with following extra content:
{code}
  "changed-configurations" : [ {
    "type" : "yarn-site",
    "name" : "yarn.scheduler.maximum-allocation-mb"
  } ],
  "depended-configurations" : [ {
    "type" : "mapred-site",
    "name" : "yarn.app.mapreduce.am.resource.mb"
  }, {
    "type" : "yarn-site",
    "name" : "yarn.scheduler.maximum-allocation-mb"
  }, {
    "type" : "mapred-site",
    "name" : "yarn.app.mapreduce.am.admin-command-opts"
  }, {
    "type" : "mapred-site",
    "name" : "mapreduce.map.memory.mb"
  }, {
    "type" : "mapred-site",
    "name" : "yarn.app.mapreduce.am.command-opts"
  }, {
    "type" : "mapred-site",
    "name" : "mapreduce.reduce.java.opts"
  }, {
    "type" : "mapred-site",
    "name" : "mapreduce.reduce.memory.mb"
  }, {
    "type" : "mapred-site",
    "name" : "mapreduce.task.io.sort.mb"
  }, {
    "type" : "mapred-site",
    "name" : "mapreduce.map.java.opts"
  } ]
{code}

The configuration depended-by should not be added on to the services.json like this. All the
configuration dependencies should be got from manipulating the {{org.apache.ambari.server.api.services.stackadvisor.commands.StackAdvisorCommand.GET_SERVICES_INFO_URI}}
value. Changing the value to include configuration depends_on and depended_by information.
Then the python script should build the dependency-chain inside itself instead of doing it
in Java and adding to services.json.

The reason this is important is that for future functionality, we need services.json and hosts.json
to faithfully represent the cluster's services and hosts information. The custom stack-advisor
scripts should have logic to interpret it for their own needs. If we do some processing in
Java, then stack-providers will not have chance to make their own interpretations.



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