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https://issues.apache.org/jira/browse/THRIFT-110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637796#action_12637796
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David Reiss commented on THRIFT-110:
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Chad, that would probably work, but negative field ids are pretty bad from a 
standpoint of safety and compatibility, so I don't think we should expend 
implementation time or CPU time supporting them.  I'm fine with making them 
very inefficient.  If it makes it easier to implement the compact protocol 
faster in more languages, I'd also be fine with throwing an exception on 
negative field ids.  No segfaults, though.

> A more compact format 
> ----------------------
>
>                 Key: THRIFT-110
>                 URL: https://issues.apache.org/jira/browse/THRIFT-110
>             Project: Thrift
>          Issue Type: Improvement
>            Reporter: Noble Paul
>         Attachments: compact_proto_spec.txt
>
>
> Thrift is not very compact in writing out data as (say protobuf) . It does 
> not have the concept of variable length integers and various other 
> optimizations possible . In Solr we use a lot of such optimizations to make a 
> very compact payload. Thrift has a lot common with that format.
> It is all done in a single class
> http://svn.apache.org/viewvc/lucene/solr/trunk/src/java/org/apache/solr/common/util/NamedListCodec.java?revision=685640&view=markup
> The other optimizations include writing type/value  in same byte, very fast 
> writes of Strings, externalizable strings etc 
> We could use a thrift format for non-java clients and I would like to see it 
> as compact as the current java version

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