Till Rohrmann created FLINK-5098:
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Summary: Detect network problems to eagerly time out ask operations
Key: FLINK-5098
URL: https://issues.apache.org/jira/browse/FLINK-5098
Project: Flink
Issue Type: Improvement
Components: Distributed Coordination
Affects Versions: 1.2.0
Reporter: Till Rohrmann
Assignee: Till Rohrmann
Fix For: 1.2.0
Akka's ask operations are given a timeout after which they should fail with an
{{AskTimeoutException}}. In some cases, however, it is possible to fail early
because one has detected that the remote host is not reachable or that the
actor does not exist on the remote {{ActorSystem}}.
Usually failing early if one cannot hope for a successful message delivery is a
desirable behaviour since it speeds up recovery.
I propose to send Akka's {{Identify}} message with each ask request. The
identify message allows to detect unreachable/non-existing actors and, thus,
enables us to fail the ask operation early.
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