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https://issues.apache.org/jira/browse/HBASE-2877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved HBASE-2877.
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Resolution: Not a Problem
Stale
> Unnecessary byte written when serializing a Writable RPC parameter
> ------------------------------------------------------------------
>
> Key: HBASE-2877
> URL: https://issues.apache.org/jira/browse/HBASE-2877
> Project: HBase
> Issue Type: Bug
> Components: IPC/RPC
> Affects Versions: 0.20.5, 0.89.20100621, 0.90.0, 0.90.1, 0.90.2, 0.90.3,
> 0.90.4, 0.90.5, 0.90.6, 0.92.0, 0.92.1, 0.94.0
> Reporter: Benoit Sigoure
> Priority: Minor
>
> When {{HbaseObjectWritable#writeObject}} serializes a {{Writable}} RPC
> parameter, it writes its "class code" twice to the wire. {{writeClassCode}}
> is already called once unconditionally at the beginning of the method, and
> for {{Writable}} arguments, it's called a second time towards the end of the
> method. It seems that the code is trying to deal with the "declared type"
> vs. "actual type" of a parameter. The Hadoop RPC code was already doing this
> before Stack changed it to use codes in r608738 for HADOOP-2519. It's not
> documented when this is useful though, and I couldn't find any use case.
> Every RPC I've seen so far just ends up with the same byte sent twice to the
> wire.
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