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https://issues.apache.org/jira/browse/CASSANDRA-18845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17766694#comment-17766694
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Cameron Zemek commented on CASSANDRA-18845:
-------------------------------------------
[^delay.log]
Attached a log from 105 node test cluster that shows the delay between starting
to wait for gossip and getting replies back for UP .
Snippet
{noformat}
Sep 19 08:09:45 ip-10-1-57-23 cassandra[131402]: INFO
org.apache.cassandra.gms.Gossiper Waiting for gossip to settle...
Sep 19 08:10:56 ip-10-1-57-23 cassandra[131402]: DEBUG
org.apache.cassandra.gms.Gossiper Sending a EchoMessage to /35.83.14.80
Sep 19 08:10:57 ip-10-1-57-23 cassandra[131402]: INFO
org.apache.cassandra.gms.Gossiper InetAddress /54.149.62.104 is now UP{noformat}
So the delay is in sending out the Echo.
> 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
> Priority: Normal
> Attachments: delay.log, example.log,
> image-2023-09-14-11-16-23-020.png, test1.log, test2.log, test3.log
>
>
> 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
> > 1)
> {
> logger.debug("Gossip looks settled.");
> numOkay++;
> } {code}
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