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https://issues.apache.org/jira/browse/MESOS-7688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ilya Pronin updated MESOS-7688:
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Attachment: reregistration.svg
reregistration.perf.gz
Attached a perf script ([^reregistration.perf.gz]) and a flamegraph
([^reregistration.svg]) for a 2 minute sample of agents reregistration after
master failover.
> Improve master failover performance by reducing unnecessary agent retries.
> --------------------------------------------------------------------------
>
> Key: MESOS-7688
> URL: https://issues.apache.org/jira/browse/MESOS-7688
> Project: Mesos
> Issue Type: Improvement
> Components: agent, master
> Reporter: Benjamin Mahler
> Labels: scalability
> Attachments: 1.2.0.png, reregistration.perf.gz, reregistration.svg
>
>
> Currently, during a failover the agents will (re-)register with the master.
> While the master is recovering, the master may drop messages from the agents,
> and so the agents must retry registration using a backoff mechanism. For
> large clusters, there can be a lot of overhead in processing unnecessary
> retries from the agents, given that these messages must be deserialized and
> contain all of the task / executor information many times over.
> In order to reduce this overhead, the idea is to avoid the need for agents to
> blindly retry (re-)registration with the master. Two approaches for this are:
> (1) Update the MasterInfo in ZK when the master is recovered. This is a bit
> of an abuse of MasterInfo unfortunately, but the idea is for agents to only
> (re-)register when they see that the master reaches a recovered state. Once
> recovered, the master will not drop messages, and therefore agents only need
> to retry when the connection breaks.
> (2) Have the master reply with a retry message when it's in the recovering
> state, so that agents get a clear signal that their messages were dropped.
> The agents only retry when the connection breaks or they get a retry message.
> This one is less optimal, because the master may have to process a lot of
> messages and send retries, but once the master is recovered, the master will
> process only a single (re-)registration from each agent. The number of
> (re-)registrations that occur while the master is recovering can be reduced
> to 1 in this approach if the master sends the retry message only after the
> master completes recovery.
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