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https://issues.apache.org/jira/browse/CASSANDRA-16301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17239247#comment-17239247
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Benjamin Lerer commented on CASSANDRA-16301:
--------------------------------------------
I added your suggestions. Thanks for the review. :-)
> upgrade from C* 3.11.9 to 4.0-beta3 fails if 3.11.9 is configured with
> OldNetworkTopologyStrategy
> -------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-16301
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16301
> Project: Cassandra
> Issue Type: Bug
> Reporter: Yongle Zhang
> Assignee: Benjamin Lerer
> Priority: Normal
>
> When we upgrade Cassandra from 3.11.9 to 4.0-beta3, if the old cluster
> (3.11.9) is configured with OldNetworkTopologyStrategy, 4.0-beta3 Cassandra
> fails to start with the following exception:
>
> {code:java}
> ERROR [main] 2020-11-24 22:49:33,423 CassandraDaemon.java:278 - Error while
> loading schema:
> org.apache.cassandra.exceptions.ConfigurationException: Unable to find
> replication strategy class
> 'org.apache.cassandra.locator.OldNetworkTopologyStrategy'
> at
> org.apache.cassandra.utils.FBUtilities.classForName(FBUtilities.java:720)
> at
> org.apache.cassandra.locator.AbstractReplicationStrategy.getClass(AbstractReplicationStrategy.java:422)
> at
> org.apache.cassandra.schema.ReplicationParams.fromMapWithDefaults(ReplicationParams.java:90)
> at
> org.apache.cassandra.schema.ReplicationParams.fromMap(ReplicationParams.java:82)
> at
> org.apache.cassandra.schema.KeyspaceParams.create(KeyspaceParams.java:64)
> at
> org.apache.cassandra.schema.SchemaKeyspace.fetchKeyspaceParams(SchemaKeyspace.java:971)
> at
> org.apache.cassandra.schema.SchemaKeyspace.fetchKeyspace(SchemaKeyspace.java:956)
> at
> org.apache.cassandra.schema.SchemaKeyspace.fetchKeyspacesWithout(SchemaKeyspace.java:949)
> at
> org.apache.cassandra.schema.SchemaKeyspace.fetchNonSystemKeyspaces(SchemaKeyspace.java:859)
> at org.apache.cassandra.schema.Schema.loadFromDisk(Schema.java:100)
> at org.apache.cassandra.schema.Schema.loadFromDisk(Schema.java:89)
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:274)
> at
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:671)
> at
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:795)
> Caused by: java.lang.ClassNotFoundException:
> org.apache.cassandra.locator.OldNetworkTopologyStrategy
> at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:264)
> at
> org.apache.cassandra.utils.FBUtilities.classForName(FBUtilities.java:716)
> ... 13 common frames omitted
> Exception (org.apache.cassandra.exceptions.ConfigurationException)
> encountered during startup: Unable to find replication strategy class
> 'org.apache.cassandra.locator.OldNetworkTopologyStrategy'{code}
>
>
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