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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