[jira] [Created] (AMBARI-11202) templeton.hive.properties property value substitution should be done by ambari-server

["Robert Levas (JIRA)" <ji...@apache.org>]

Robert Levas created AMBARI-11202:
-------------------------------------

             Summary: templeton.hive.properties property value substitution should be done by ambari-server
                 Key: AMBARI-11202
                 URL: https://issues.apache.org/jira/browse/AMBARI-11202
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
    Affects Versions: 2.1.0
            Reporter: Robert Levas
            Assignee: Robert Levas
            Priority: Critical
             Fix For: 2.1.0


The webhcat-site/templeton.hive.properties property value substitution should be done by ambari-server.  This value is more complicated than others since the (embedded) hive.metastore.uris property is a list of thrift URIs generated using the set of hosts the Hive Metastore is installed on.  This list of hosts comes from the clusterHostInfo/hive_metastore_host value, which in the KerberosHelper (org.apache.ambari.server.controller.KerberosHelper) is available as a comma-delimited list of hosts.

{code}
clusterHostInfo/hive_metastore_host = "host1,host2,host3"
{code}

To generate configuration values when enabling Kerberos, the KerberosHelper class uses org.apache.ambari.server.state.kerberos.AbstractKerberosDescriptor#replaceVariables to replace variables specified in the Kerberos Descriptor.  Currently this mechanism uses a simple replacement scheme, which is not sufficient to generate string using a delimited list of values. 

In order to solve this issue, "functions" need to be applied to replacement data before making the substitution.  In this case a "function" named "each" will be created that takes the following arguments:
* pattern with placeholders
* delimiter to use to concatenate values generated using the patter
* delimiter to use to split the original string

For example: 
{code}
each('thrift://%s:9083', '\,', ',')
{code}

To indicate this function is to be used, the following Kerberos Descriptor variable replacement syntax is to be used:
{code}
${clusterHostInfo/hive_metastore_host|each('thrift://%s:9083', '\,', ',')}
{code}

If clusterHostInfo/hive_metastore_host = "host1,host2,host3", the result would be 
{code}
thrift://host1:9083\,thrift://host2:9083\,thrift://host3:9083
{code}



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