Appendix N. 0.95 RPC Specification

Appendix N. 0.95 RPC Specification
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Table of Contents

N.3.1. Connection Setup
N.3.2. Request
N.3.3. Response
N.3.4. Exceptions
N.3.5. CellBlocks

N.4.1. Constraints
N.4.2. One fat pb request or header+param
N.4.3. RPC Configurations

In 0.95, all client/server communication is done with protobuf’ed Messages rather than with Hadoop Writables. Our RPC wire format therefore changes. This document describes the client/server request/response protocol and our new RPC wire-format.

For what RPC is like in 0.94 and previous, see Benoît/Tsuna’s Unofficial Hadoop / HBase RPC protocol documentation. For more background on how we arrived at this spec., see HBase RPC: WIP

N.1. Goals

A wire-format we can evolve
A format that does not require our rewriting server core or radically changing its current architecture (for later).

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