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https://issues.apache.org/jira/browse/IGNITE-4157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15831847#comment-15831847
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ASF GitHub Bot commented on IGNITE-4157:
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GitHub user sergey-chugunov-1985 opened a pull request:
https://github.com/apache/ignite/pull/1447
IGNITE-4157 mapping updates notification hook
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gridgain/apache-ignite ignite-4157
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/ignite/pull/1447.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1447
----
----
> Use discovery custom messages instead of marshaller 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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