[
https://issues.apache.org/jira/browse/CASSANDRA-18999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17801031#comment-17801031
]
Paulo Motta commented on CASSANDRA-18999:
-----------------------------------------
I created CASSANDRA-19243 to have a wider review on removal of pre-4.0
compatibility code.
For this ticket, let's just merge the original 4.0/4.1/5.0 PRs fixing
{{Gossiper::hasMajorVersion3Nodes}} without removing pre-4.0 compatibility code
from 5.0:
I have prepared the patches for commit:
*
[cassandra-4.0|https://github.com/pauloricardomg/cassandra/tree/cassandra-4.0]
*
[cassandra-4.1|https://github.com/pauloricardomg/cassandra/tree/cassandra-4.1]
*
[cassandra-5.0|https://github.com/pauloricardomg/cassandra/tree/cassandra-5.0]
I've submitted a [devbranch
job|https://ci-cassandra.apache.org/job/Cassandra-devbranch/2649/] for the
cassandra-5.0 branch but it seems ci-cassandra.a.o is unavailable.
I don't have circle environment setup, so I will wait until jenkins is back or
someone submits a circle job for cassandra-5.0 before committing this.
> Gossiper::hasMajorVersion3Nodes returns true when a cluster is upgrading
> patch version without Cassandra 3 nodes.
> -----------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-18999
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18999
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Distributed Metadata
> Reporter: Isaac Reath
> Assignee: Isaac Reath
> Priority: Low
> Labels: lhf
> Fix For: 4.0.x, 4.1.x, 5.0.x
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> When working on https://issues.apache.org/jira/browse/CASSANDRA-18968 we
> found that {{Gossiper::hasMajorVersion3Nodes}} will return true when the
> cluster is undergoing an upgrade from a patch version even if the cluster has
> no Cassandra 3 nodes in it.
> This can be reproduced by running this Gossiper test:
> {code:java}
> @Test
> public void
> testHasVersion3NodesShouldReturnFalseWhenNoVersion3NodesDetectedAndCassandra4UpgradeInProgress()
> throws Exception
> {
> Gossiper.instance.start(0);
> Gossiper.instance.expireUpgradeFromVersion();
> VersionedValue.VersionedValueFactory factory = new
> VersionedValue.VersionedValueFactory(null);
> EndpointState es = new EndpointState((HeartBeatState) null);
> es.addApplicationState(ApplicationState.RELEASE_VERSION,
> factory.releaseVersion(CURRENT_VERSION.toString()));
>
> Gossiper.instance.endpointStateMap.put(InetAddressAndPort.getByName("127.0.0.1"),
> es);
>
> Gossiper.instance.liveEndpoints.add(InetAddressAndPort.getByName("127.0.0.1"));
> es = new EndpointState((HeartBeatState) null);
> String previousPatchVersion = String.valueOf(CURRENT_VERSION.major) +
> '.' + (CURRENT_VERSION.minor) + '.' + (CURRENT_VERSION.patch - 1);
> es.addApplicationState(ApplicationState.RELEASE_VERSION,
> factory.releaseVersion(previousPatchVersion));
>
> Gossiper.instance.endpointStateMap.put(InetAddressAndPort.getByName("127.0.0.2"),
> es);
>
> Gossiper.instance.liveEndpoints.add(InetAddressAndPort.getByName("127.0.0.2"));
> assertFalse(Gossiper.instance.hasMajorVersion3Nodes());
> }
> {code}
> This seems to be because of
> [https://github.com/apache/cassandra/blob/cassandra-4.1/src/java/org/apache/cassandra/gms/Gossiper.java#L2360],
> where an upgrade in progress is possible but we are not upgrading from a
> lower family version (i.e from 4.1.1 to 4.1.2).
> From the comment in this function, it seems instead of the existing check, we
> would want to iterate over all known endpoints in gossip and return true if
> any of them do not have a version (similar to
> [https://github.com/apache/cassandra/blob/cassandra-4.1/src/java/org/apache/cassandra/gms/Gossiper.java#L227-L236)
>
> |https://github.com/apache/cassandra/blob/cassandra-4.1/src/java/org/apache/cassandra/gms/Gossiper.java#L227-L236).]
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