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From "Sergey Chugunov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-4157) Use discovery custom messages instead of marshaller and system cache
Date Mon, 14 Nov 2016 15:54:58 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-4157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15664259#comment-15664259
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Sergey Chugunov commented on IGNITE-4157:
-----------------------------------------

implemented traffic-optimized solution of NodeAdded message for MarshallerMapping component.

> Use discovery custom messages instead of marshaller and system cache
> --------------------------------------------------------------------
>
>                 Key: IGNITE-4157
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4157
>             Project: Ignite
>          Issue Type: Improvement
>          Components: cache
>            Reporter: Alexey Goncharuk
>            Assignee: Sergey Chugunov
>             Fix For: 2.0
>
>
> Currently we use system caches for keeping classname to class ID mapping and for storing
binary metadata
> This has several serious disadvantages:
> 1) We need to introduce at least two additional thread pools for each of these caches
> 2) Since cache operations require stable topology, registering a class ID or updating
metadata inside a transaction or another cache operation is tricky and deadlock-prone.
> 3) It may be beneficial in some cases to have nodes with no caches at all, currently
this is impossible because system caches are always present.
> 4) Reading binary metadata leads to huge local contention, caching metadata values in
a local map doubles memory consumption
> I suggest we use discovery custom events for these purposes. Each node will have a corresponding
local map (state) which will be updated inside custom event handler. From the first point
of view, this should remove all the disadvantages above.



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