Github user clockfly commented on the pull request:
https://github.com/apache/storm/pull/268#issuecomment-60870953
@tedxia
I got a chance to chat with Ted online. In summary, he is descrbing the
following case ï¼worker A -> worker B):
1. B dies
2. after zk session timeout, zk knows B is dead
3. A is initiating the reconnection process to B. By default, it will retry
300 times at max.(it should be larger than 120second, based on the comments in
config) â ``` # Since nimbus.task.launch.secs and
supervisor.worker.start.timeout.secs are 120, other workers should also wait
at least that long before giving up on connecting to the other worker.```â
4. zk is under heavy load(consider a zk tree which have 100 thoudsands
nodes, and many many watchers), may take minutes to notify A that B is dead.
5. A didn't get notification from zk in time after 300 connection retries,
reconnection failedï¼ it throws, which will cause the worker to exit.
Basically there are two questions asked. First, whether we can assure the
zookeeper is responsive(< 1minute). Second, If worker doesn't get update of B
from zookeeper after 300 reconnection retries, should we exit the worker or let
worker continues to work?
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