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https://issues.apache.org/jira/browse/HBASE-4459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113413#comment-13113413
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Todd Lipcon commented on HBASE-4459:
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We probably have to worry that someone has stored HBaseObjectWritables
somewhere persistent, in which case just making the type a short is not
backwards-compatible. Perhaps we should make it a varint, which I believe will
encode the same for any existing data, but would be multibyte-capable?
> HbaseObjectWritable code is a byte, we will eventually run out of codes
> -----------------------------------------------------------------------
>
> Key: HBASE-4459
> URL: https://issues.apache.org/jira/browse/HBASE-4459
> Project: HBase
> Issue Type: Bug
> Components: io
> Reporter: Jonathan Gray
> Priority: Critical
> Fix For: 0.94.0
>
>
> There are about 90 classes/codes in HbaseObjectWritable currently and
> Byte.MAX_VALUE is 127. In addition, anyone wanting to add custom classes but
> not break compatibility might want to leave a gap before using codes and
> that's difficult in such limited space.
> Eventually we should get rid of this pattern that makes compatibility
> difficult (better client/server protocol handshake) but we should probably at
> least bump this to a short for 0.94.
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