Joe Smith created MESOS-2681:
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Summary: Slave process must restart to update ensemble members
Key: MESOS-2681
URL: https://issues.apache.org/jira/browse/MESOS-2681
Project: Mesos
Issue Type: Bug
Components: slave
Reporter: Joe Smith
Right now, if a ZooKeeper ensemble has (for instance) more observers added to
it, the Mesos Slaves will not see them, and continue to attempt to connect to
only the original members. A restart of the slave process is required to call
{{getaddrinfo}} again and enumerate the list of hosts in the ensemble.
Subsequent {{getaddrinfo}} calls _will only_ occur when {{zookeeper_init()}} is
called again, that is to say: when the old session expires and you need to
create a new one. If you swap all hosts in your ensemble too fast, without
permitting time for old sessions to expire, you'd end up with clients looping
forever, trying to connect to the old servers in order to get its old session
expired.
This is best tracked by ZOOKEEPER-1998, where these is some discussion about a
necessary improvement to the implementation already in the 3.5.x branch, or
putting this functionality (debatably a feature vs. fixing a bug) in 3.4.x.
(Thanks to [~rgs] for reviewing this as well)
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