Provide access to RpcServer instance from RegionServerServices
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Key: HBASE-4425
URL: https://issues.apache.org/jira/browse/HBASE-4425
Project: HBase
Issue Type: Improvement
Components: coprocessors, regionserver
Reporter: Gary Helmling
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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