[jira] [Created] (IGNITE-4480) Incorrect cancellation semantics in IgniteFuture.

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

Vladimir Ozerov created IGNITE-4480:
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             Summary: Incorrect cancellation semantics in IgniteFuture.
                 Key: IGNITE-4480
                 URL: https://issues.apache.org/jira/browse/IGNITE-4480
             Project: Ignite
          Issue Type: Task
          Components: general
    Affects Versions: 1.8
            Reporter: Vladimir Ozerov
             Fix For: 2.0


*Problem*
Normally, if user invoke "cancel()" on future, he expects that it will be completed immediately. E.g. this is how JDK {{CompletableFuture}} works. However, this is not the case for Ignite - we inform user about cancellation through flag, which is also not set properly in most cases.

*Solution*
1) {{cancel()}} must complete future with special "CancellationException" immediately.
2) {{isCancelled()}} method should be either removed or deprecated.
3{ We should add {{isCompletedExceptionally()}} method which will return {{true}} in case future was completed with any kind of exception. This will work similar to JDK {{CompletableFuture}}.



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