[jira] [Created] (CASSANDRA-18845) Waiting for gossip to settle on live endpoints

["Cameron Zemek (Jira)" <ji...@apache.org>]

Cameron Zemek created CASSANDRA-18845:
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             Summary: Waiting for gossip to settle on live endpoints
                 Key: CASSANDRA-18845
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18845
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Cameron Zemek


This is a follow up to CASSANDRA-18543

Although that ticket added ability to set cassandra.gossip_settle_min_wait_ms this is tedious and error prone. On a node just observed a 79 second gap between waiting for gossip and the first echo response to indicate a node is UP.

The problem being that do not want to start Native Transport until gossip settles otherwise queries can fail consistency such as LOCAL_QUORUM as it thinks the replicas are still in DOWN state.

Instead of having to set gossip_settle_min_wait_ms I am proposing that (outside single node cluster) wait for UP message from another node before considering gossip as settled. Eg.
{code:java}
            if (currentSize == epSize && currentLive == liveSize && liveSize > 0)
            {
                logger.debug("Gossip looks settled.");
                numOkay++;
            } {code}



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