Brandon Williams created CASSANDRA-9206:
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Summary: Remove seed gossip probability
Key: CASSANDRA-9206
URL: https://issues.apache.org/jira/browse/CASSANDRA-9206
Project: Cassandra
Issue Type: Improvement
Reporter: Brandon Williams
Assignee: Brandon Williams
Currently, we use probability to determine whether a node will gossip with a
seed:
{noformat}
double probability = seeds.size() / (double)
(liveEndpoints.size() + unreachableEndpoints.size());
double randDbl = random.nextDouble();
if (randDbl <= probability)
sendGossip(prod, seeds);
{noformat}
I propose that we remove this probability, and instead *always* gossip with a
seed. This of course means increased traffic and processing on the seed(s),
but even a 1000 node cluster with a single seed will only put ~1000 messages
per second on the seed, which is virtually nothing. Should it become a
problem, the solution is simple: add more seeds. Since seeds will also always
gossip with each other, this effectively gives us a poor man's spanning tree,
with the only cost being removing a few lines code, and should greatly improve
our gossip convergence time, especially in large clusters.
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