[jira] [Commented] (IGNITE-3471) Do not send previous value to client node for invoke() when possible

["Andrey Velichko (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-3471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15445868#comment-15445868 ] 

Andrey Velichko commented on IGNITE-3471:
-----------------------------------------

Created reproduce test. Inside transaction, for every put operation for CacheEntryProcessor call method process() twice on local node, and one time on remote node after commit.

> Do not send previous value to client node for invoke() when possible
> --------------------------------------------------------------------
>
>                 Key: IGNITE-3471
>                 URL: https://issues.apache.org/jira/browse/IGNITE-3471
>             Project: Ignite
>          Issue Type: Task
>          Components: cache
>    Affects Versions: 1.4
>            Reporter: Alexey Goncharuk
>            Assignee: Andrey Velichko
>
> Currently for invoke() or invokeAll() methods we send previous cache value to near node and apply EntryProcessor locally to get a return value. This can induce a significant overhead when cache value is much larger than entry processor result.
> For many cases this can be avoided, e.g.
> {code}
> try (tx = txStart()) {
>     cache.invoke(key, EP); // No need to send previous value to client in this case.
>     tx.commit();
> }
> {code}
> Note that we need to add additional handling of such a case:
> {code}
> try (tx = txStart()) {
>     cache.invoke(key, EP); // No need to send previous value to client in this case.
>     cache.get(key); // This should actually get the current cache value from primary node and apply an entry processor locally to get the updated value.
>     tx.commit();
> }
> {code}



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