expose "propagation delay" metric in JMX
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Key: CASSANDRA-3858
URL: https://issues.apache.org/jira/browse/CASSANDRA-3858
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Peter Schuller
Priority: Minor
My idea is to augment the gossip protocol to contain timestamps. We wouldn't
use the timestamps for anything "important", but we could use them to allow
each node to expose a number which is the number of milliseconds (or seconds)
"old" information is about nodes that are "the oldest" and also alive.
When nodes go down you'd see spikes, but for most cases where nodes live, this
information should give you a pretty good idea of how fast gossip information
is propagating through the cluster, assuming you keep your clocks in synch.
It should be a good thing to have graphed, and to have alerts on.
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