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https://issues.apache.org/jira/browse/CASSANDRA-18845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17764726#comment-17764726
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Stefan Miklosovic edited comment on CASSANDRA-18845 at 9/13/23 2:51 PM:
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Yeah, like ... if there is 20 nodes, RF is 5 and QUORUM is 3, then "liveSize >
1" is at least 2. But how do we know that these "2" satisfy _each query on
local quorum_ ? Maybe there is a query for which quorum requires such nodes to
be alive which are not detected yet, or maybe I am missing something here.
was (Author: smiklosovic):
Yeah, like ... if there is 20 nodes, RF is 5 and QUORUM is 3, then "liveSize >
1" is at least 2. But how do we know that these "2" satisfy _each query on
local quorum_ ? Maybe there is a query for which quorum requires such nodes
live which are not detected yet, or maybe I am missing something here.
> 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: 18845-3.11.patch, 18845-4.0.patch, 18845-4.1.patch,
> 18845-5.0.patch
>
>
> 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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