Bill Farner created MESOS-409:
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Summary: Master detector code should stat nodes before attempting
to create
Key: MESOS-409
URL: https://issues.apache.org/jira/browse/MESOS-409
Project: Mesos
Issue Type: Improvement
Components: slave
Reporter: Bill Farner
Priority: Minor
The master detector code currently recursively walks the permanent node path
(e.g. /home/mesos/cluster), attempting to create /home, then /home/mesos, then
/home/mesos/cluster; trapping NoAuth and NodeExists errors along the way.
A simple performance improvement would be to perform a stat on the full
permanent path and skip the recursive creation if it exists. Alternatively, it
seems practical to forego node creation by the slave altogether, and have the
slave commit suicide if the permanent node is not present.
The current behavior results in reams of zookeeper server logging when there is
a master failover, as user errors are logged by default (which we'd prefer to
retain). I'm not sure what the performance impact this has on ZooKeeper, but
it's non-zero and a fix seems trivial.
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