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https://issues.apache.org/jira/browse/IGNITE-5097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16343237#comment-16343237
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Igor Sapego commented on IGNITE-5097:
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[~daradurvs], as environment variable backward-compatibility approach has been 
rejected, there is much more effort needed now to implement it on C++ side now 
and it is harder for me now to find timespan long enough for that. I do 
remember about this task though.

> BinaryMarshaller should write ints in "varint" encoding where it makes sense
> ----------------------------------------------------------------------------
>
>                 Key: IGNITE-5097
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5097
>             Project: Ignite
>          Issue Type: Task
>          Components: binary
>    Affects Versions: 2.0
>            Reporter: Vladimir Ozerov
>            Assignee: Vyacheslav Daradur
>            Priority: Major
>              Labels: iep-2, performance
>             Fix For: 2.5
>
>
> There are a lot of places in the code where we write integers for some 
> special purposes. Quite often their value will be vary small, so that 
> applying "varint" format could save a lot of space at the cost of very low 
> additional CPU overhead. 
> Specifically:
> 1) Array/collection/map lengths
> 2) BigDecimal's (usually will save ~6 bytes)
> 3) Strings
> 4) Enum ordinals



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