How big is your cluster?
It looks like the failure detector takes much longer than you'd want it to
(or simply does not) to no longer suspect other nodes. This could happen
with an accrual FD that gets a lot of slow heartbeats. What's your value of
the suspicion threshold? (akka.cluster.failure-detector.threshold)
On 2 March 2018 at 14:46, Nikos Viorres <nvior...@gmail.com> wrote:
> Hi all,
> First off all, i'd like to state that we have a "noisy" operational
> environment where network partitions occur more often than we'd like and
> certain components (cluster nodes) experience high GC pause times.
> That being said, we are facing the following issue with a higher frequency
> than one would expect: Nodes being marked "Unreachable" by part of / the
> whole cluster for a period of time (during which there were issues), and
> failing to get back to "Reachable" even after the transient issue gets
> resolved. In most cases, most nodes in the cluster that had marked such a
> node as Unreachable is able to re-establish communication and move their
> status back to Reachable, but some node(s) fail to do so even though
> evidence shows that communication with all the rest is trouble free and
> there is no partition at the network layer that point in time. We deduce
> the last bit by the fact that the node that's stuck to think that the once
> problematic node is still Unreachable receives gossip information from it
> but discards it for obvious reasons (with the message 'Ignoring received
> gossip from unreachable...'). I should add at this point that no Quarantine
> takes place in any of these cases and auto-shutdown is disabled.
> Does anyone have any ideas why this might be happening? By looking at the
> logs / code, it is as if the offending node by some combination of events
> stops sending Heartbeats permanently to the nodes that exhibit the issue.
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