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https://issues.apache.org/jira/browse/KNOX-1167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Phil Zampino updated KNOX-1167:
-------------------------------
Summary: Support HDFS Federation in Knox topology generation (was: Support
HDFS Federation in Knox topologies)
> Support HDFS Federation in Knox topology generation
> ---------------------------------------------------
>
> Key: KNOX-1167
> URL: https://issues.apache.org/jira/browse/KNOX-1167
> Project: Apache Knox
> Issue Type: Bug
> Components: Server
> Affects Versions: 0.14.0, 1.0.0
> Reporter: Phil Zampino
> Assignee: Phil Zampino
> Priority: Major
> Fix For: 1.1.0
>
>
> In HDP 3, there will be support for multiple NameNode clusters (HDFS
> Federation), qualified by disitinct namespaces, in a single Hadoop cluster.
> Knox needs to provide the ability to distinguish these NN clusters in its
> topologies for proxying WEBHDFS; the most practical means is a service
> parameter.
> The behavior for the following needs to be defined:
> * Given multiple NN clusters, and a descriptor which does not specify such a
> namespace; which NN cluster will be chosen at discovery-time?
>
> [https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/Federation.html#Configuration:]
>
> It seems the following config properties are available for federated namenode
> deployments:
> * core-site.xml: fs.defaultFS
> The value is the default HDFS nameservice URL (e.g., hdfs://ns1) or the
> default namenode endpoint (e.g., hdfs://hostname:8020)
> * hdfs-site.xml: dfs.nameservices
> Comma-delimited list of nameservices (e.g., "ns1,ns2")
> * hdfs-site.xml: dfs.ha.namenodes.NAMESERVICE (e.g.,
> dfs.ha.namenodes.ns1=nn1,nn3)
> Identifies the namenodes associated with a given nameservice
> *
> hdfs-site.xml: dfs.namenode.http-address._NAMESERVICE_._NODENAME_
> Property name pattern for the actual HTTP endpoint addresses
>
> e.g, dfs.namenode.http-address.ns1.nn1, dfs.namenode.http-address.ns1.nn3,
> dfs.namenode.http-address.ns2.nn4, dfs.namenode.http-address.ns2.nn7
>
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