Hi,
I am trying to validate below statements in Akka Docs with slight twist in
the scenario. After first seed node is brought down and before restarting
the first seed-node, I try to restart another surviving node of cluster
"*When a new node is started it sends a message to all seed nodes and then
sends join command to the one that answers first.*"
In conjunction with
"*Once more than two seed nodes have been started it is no problem to shut
down the first seed node. If the first seed node is restarted, it will
first try to join the other seed nodes in the existing cluster.* "
My configuration for 3 nodes (ie. 3 JVMs running on same machine) is as
following in same order :
cluster {
// URL format is 'akka://' for artery. When netty is to be enabled,
// change this to 'akka.tcp://'
seed-nodes = [
"akka.tcp://ClusterSystem@127.0.0.1:25510", // 1st Seed Node
"akka.tcp://ClusterSystem@127.0.0.1:25520", // 2nd Seed Node
"akka.tcp://ClusterSystem@127.0.0.1:25530" // 3rd Seed Node
]
seed-node-timeout = 12s
#auto-down-unreachable-after = 10s
#allow-weakly-up-members = on
}
*TEST SCENARIO 1 (PASSED)* : Bring up nodes in any order and form the cluster
*TEST SCENARIO 2 (PASSED)* : After cluster is formed, bring down the first seed
node (ie. akka.tcp://ClusterSystem@127.0.0.1:25510).
Ensure remaining cluster works without any disruption
*TEST SCENARIO 3 (NOT PASSING**)* : Bring down 3rd node
(akka.tcp://ClusterSystem@127.0.0.1:25530) when 1st seed node is still DOWN.
And then bring up 3rd node.
As I understand from first referred
statement from documentation, 3rd seed node must be able to join 2nd seed-node
even when 1st node is down
But the observation is that 3rd seed node
does NOT join the cluster.
Of course, only when 2nd node is surviving and I bring up 1st as well as 3rd
node, cluster forms correctly again
*Clarification :*
1) Documentation mentions "once more than 2 seed nodes have been started". Does
that mean that my TEST SCENARIO 3 above is invalid ? In other words, at any
point in time,
I should have at least 2 seed nodes of cluster to be alive make the TEST
SCENARIO 3 above pass ?
2) And, if there are double faults like TEST SCENARIO 3, will cluster not
converge till we perform full cluster reboot or bring back the first node in
seed node list ?
Regards
Muthu
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