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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