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From "Igor Seliverstov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-4646) Try to unmarshall direct messages in striped pool
Date Wed, 08 Feb 2017 17:50:41 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-4646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15858305#comment-15858305

Igor Seliverstov commented on IGNITE-4646:

Made changes after last tests fail, waiting for results



> Try to unmarshall direct messages in striped pool
> -------------------------------------------------
>                 Key: IGNITE-4646
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4646
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Yakov Zhdanov
>            Assignee: Igor Seliverstov
>             Fix For: 2.0
> During marshalling in NIO thread the following should be added to the write buffer and
sent to peer:
> 1. chunk size - 16 bits (this probably puts limitation on max write buffer size of 64k
or will require some changes to direct writer)
> 2. last  chunk - 1 bit
> 3. pool policy - 8 bits
> Here is the scheme to explain how this should work.
> {noformat}
> [chunk size] [pool policy] [partition] [last flag] [chunk data] X <-- no more space
in write buffer
> [next chunk size] [last flag] [chunk data] <<-- we write next chunk once some space
is available in write buffer, but we skip partition and policy flags and maybe others that
should be sent only once.
> ...
> ...
> [next chunk size] [last flag] [chunk data] <<-- last flag is true here
> {noformat}
> Examples
> Write buffer - 64k
> Message - 84k
> # sender reserves space for chunk size
> # reserves space for policy and last chunk flag
> # marshalls message to buffer while it has free space (64k - SPACE will be written to
> # puts size and flags to reserved space in the beginning
> # sends buffer or part of it which makes some space available to further writes
> # reserves space for next chunk size and flags
> # marshalls message to buffer while it has free space (lets assume the rest of message
> # puts size and last=true to the reserved space and sends
> Receiver:
> # reads chunk size, stores the target pool and partition
> # allocates heap buffer and copies chunk data to it from read buffer
> # once all message chunks are fully read message should be submitted to a pool where
it will be unmarshalled and processed

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