[Distributed] Timeout when direct path takes too long #4251
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In Distributed, the direct path is the very first step performed by the algorithm and the process will NOT carry on until this step finishes. In cases where a VERY long direct path is required, serval hundreds of ms may elapse before Distributed could keep on.
The idea here is not to wait too long in the sections where the direct path is dispensable.
The chosen default timeout(100ms) is wholly empirical.