[jira] [Updated] (HBASE-4425) Provide access to RpcServer instance from RegionServerServices

["Gary Helmling (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-4425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gary Helmling updated HBASE-4425:
---------------------------------

    Attachment: HBASE-4425.patch

Patch adding access to getRpcServer() to RegionServerServices.

> Provide access to RpcServer instance from RegionServerServices
> --------------------------------------------------------------
>
>                 Key: HBASE-4425
>                 URL: https://issues.apache.org/jira/browse/HBASE-4425
>             Project: HBase
>          Issue Type: Improvement
>          Components: coprocessors, regionserver
>            Reporter: Gary Helmling
>         Attachments: HBASE-4425.patch
>
>
> In some cases, RegionObserver coprocessors may want to directly access the running RpcServer instance on the region server.  For token based authentication, for example, this is needed for a coprocessor to interact with the SecretManager that validates authentication tokens in the secure RPC engine.  With the addition of async call handling on the server-side, this becomes additionally important if coprocessors want to send back delayed responses to clients.  In this case, the coprocessor would need to be able to call RpcServer.getCurrentCall() to send back the response.
> So I propose we add access to the RpcServer in RegionServerServices:
> {code}
>   /**
>    * Returns a reference to the region server's RPC server
>    */
>   public RpcServer getRpcServer();
> {code}
> We can simultaneously drop the existing RegionServerServices.getRpcMetrics() method, since this could then be accessed via RpcServer.getRpcMetrics().

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