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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11467) New impl of Registry interface not using ZK + new RPCs on master protocol
Date Tue, 08 Jul 2014 02:07:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054424#comment-14054424
] 

Gary Helmling commented on HBASE-11467:
---------------------------------------

If I understand the intent correctly, moving ClusterId discovery to a master RPC operation
creates a sort of chicken-and-egg problem for token authentication.  The RPC client needs
to know the ClusterId of the cluster it is connecting to in order to select the correct authentication
token to use.  This was possible with ZK, as the ClusterId was stored in a public znode.

If we move retrieval of the cluster ID to an RPC call on master, the client will not be able
to authenticate, since, without the ClusterId, it does not know which token to select.  I
believe this will make token authentication unusable, or else we would have to special case
that specific operation and make it _not_ require authentication on the master (which will
be tricky in itself since authentication happens on the connection level).

> New impl of Registry interface not using ZK + new RPCs on master protocol
> -------------------------------------------------------------------------
>
>                 Key: HBASE-11467
>                 URL: https://issues.apache.org/jira/browse/HBASE-11467
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Client, Consensus, Zookeeper
>            Reporter: Mikhail Antonov
>             Fix For: 2.0.0
>
>
> Currently there' only one implementation of Registry interface, which is using ZK to
get info about meta. Need to create implementation which will be using  RPC calls to master
the client is connected to.
> That includes adding several new methods to master RPC protocol:
> - GetMetaRegionLocation
> - GetClusterId
> - IsTableOnlineState
> - GetCurrentNrHRS 



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