[jira] [Updated] (FLINK-5098) Detect network problems to eagerly time out ask operations

["Robert Metzger (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-5098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Metzger updated FLINK-5098:
----------------------------------
    Fix Version/s:     (was: 1.3.0)
                   1.4.0

> 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: 1.4.0
>
>
> 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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