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From "Robert Levas (JIRA)" <>
Subject [jira] [Updated] (AMBARI-11202) property value substitution should be done by ambari-server
Date Tue, 19 May 2015 13:56:59 GMT


Robert Levas updated AMBARI-11202:
    Attachment:     (was: AMBARI-11202_01.patch)

> property value substitution should be done by ambari-server
> -------------------------------------------------------------------------------------
>                 Key: AMBARI-11202
>                 URL:
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: 2.1.0
>            Reporter: Robert Levas
>            Assignee: Robert Levas
>            Priority: Critical
>              Labels: kerberos, kerberos_descriptor
>             Fix For: 2.1.0
>         Attachments: AMBARI-11202_01.patch
> The webhcat-site/ 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
> * regex to use to split the original string
> For example: 
> {code:title=function declaration, commas are escaped when not intended to separate function
> each(thrift://%s:9083, \\,, \s*\,\s*)
> {code}
> To indicate this function is to be used, the following Kerberos Descriptor variable replacement
syntax is to be used:
> {code}
> ${clusterHostInfo/hive_metastore_host|each(thrift://%s:9083, \\,, \s*\,\s*)}
> {code}
> Note: \ characters need to be escaped in JSON structure values.  For example: 
> {code}
> "" : "${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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