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

["Alexey Goncharuk (JIRA)" <ji...@apache.org>]

Alexey Goncharuk created IGNITE-3471:
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             Summary: 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


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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