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From "Igor Sapego (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-5097) BinaryMarshaller should write ints in "varint" encoding where it makes sense
Date Tue, 16 May 2017 12:50:04 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-5097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012281#comment-16012281

Igor Sapego commented on IGNITE-5097:

In Java collection are being written in *one* call, not in several steps, and with known size,
so there is no such problem in Java.

I guess we shoud just use varlen when possible, and reserve 4 bytes otherwise.
The problem is, varint and int32 is not compatible.

> 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: general
>    Affects Versions: 2.0
>            Reporter: Vladimir Ozerov
>            Assignee: Vyacheslav Daradur
>              Labels: important, performance
>             Fix For: 2.1
> 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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