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From "Diwaker Gupta (JIRA)" <j...@apache.org>
Subject [jira] [Created] (THRIFT-1250) RPC enhancements: multiple-outstanding, retries, error code etc
Date Mon, 01 Aug 2011 18:53:09 GMT
RPC enhancements: multiple-outstanding, retries, error code etc
---------------------------------------------------------------

                 Key: THRIFT-1250
                 URL: https://issues.apache.org/jira/browse/THRIFT-1250
             Project: Thrift
          Issue Type: Improvement
          Components: Compiler (General)
            Reporter: Diwaker Gupta


The current RPC model of Thrift sends the RPC requests and responses as-is, leaving all the
smartness to the Processor implementation. While this model has the benefit of simplicity,
it does have some limitations. In particular:

* There's no easy way for applications to retry a failed RPC. In fact, there's no easy way
for the RPC layer to even communicate problems to the application (was there a transport error?
did the invoked method not exist on the remote end? some other application-specific error?
time out?).
* Supporting multiple-outstanding RPCs is challenging, because the RPC layer doesn't uniquely
identify outgoing RPC requests. So when a response comes back, there's no way to associate
it with one of the outstanding RPCs.

A fairly straight-forward approach to address these issues would be to encapsulate the RPC
request/response in a wrapper with some additional metadata. In fact, this metadata can itself
be specified as a Thrift message. Concretely, something like this:

<pre>
struct RpcRequest {
// metadata
1: required i64 id;
// optional -- may be used to sanity check
2: i32 requestSize; // including payload
3: i32 payloadSize; // just the payload
// actual request, serialized
2: required binary payload;
}
</pre>

IMO this would simplify the implementation of features like duplicate detection, RPC retries,
multiple-outstanding RPCs etc.

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