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From Devaraj Das <d...@hortonworks.com>
Subject Re: HBase wire compatibility
Date Thu, 16 Feb 2012 20:30:02 GMT
Good writeup, Jimmy (was away for a few days due to an event in my family)
Some quick questions - Has there been any thoughts on the plan to use HBASE-5394. Are we going
to make the hbase protocols (like HRegionInterface) protobuf aware?

In Hadoop, I have seen the following:
1. In HDFS, the protocol definitions are not changed (like org.apache.hadoop.hdfs.protocol.ClientProtocol).
Instead there are translators that are defined that implement the mapping of protobuf datastructures
to application-level datastructures and vice versa (for example, have a look at ClientNamenodeProtocolTranslatorPB
and ClientNamenodeProtocolServerSideTranslatorPB in the package org.apache.hadoop.hdfs.protocolPB).
2. In Yarn (MRV2), all protocol definitions are written in PB
Since the base RPC still uses writables for payload encoding, a translation happens when the
protobuf objects are sent/received (as an example look at org.apache.hadoop.ipc.ProtobufRpcEngine;
classes RpcRequestWritable and RpcResponseWritable).
What does the HBase community think about the above?

On Feb 13, 2012, at 1:02 PM, Jimmy Xiang wrote:

> I posted the proposal on wiki:
> http://wiki.apache.org/hadoop/Hbase/HBaseWireCompatibility
> Thanks,
> Jimmy
> On Mon, Feb 13, 2012 at 11:03 AM, Ted Yu <yuzhihong@gmail.com> wrote:
>> Can you post on wiki ?
>> Attachment stripped.
>> On Mon, Feb 13, 2012 at 11:01 AM, Jimmy Xiang <jxiang@cloudera.com> wrote:
>>> Hello,
>>> As HBase installation base is getting bigger, we are ready to work on the
>>> wire compatibility issue.
>>> The goal is to make HBase easier for operators to upgrade, while it is
>>> also easier for developers to
>>> enhance, re-architect if necessary.
>>> The attached is a proposal we came up.  We'd like to start with two
>> phases:
>>> Phase 1: Compatibility between client applications and HBase clusters
>>> Phase 2: HBase cluster rolling upgrade within same major version
>>> Could you please review?
>>> Thanks,
>>> Jimmy

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