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https://issues.apache.org/jira/browse/CASSANDRA-4294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13287432#comment-13287432
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Sylvain Lebresne commented on CASSANDRA-4294:
---------------------------------------------

I don't think we do, {{forwardsCompatibleOptions}} was used on the thrift side 
(so not on the upgrade path), to "support" KsDef.replication_factor. But it's 
marked deprecated so people shouldn't use it (if they do, we will ignore it and 
likely trigger an exception since the replication factor will be missing).
                
> Upgrading encounters: 'SimpleStrategy requires a replication_factor strategy 
> option.' and refuses to start
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4294
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4294
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.1.0
>            Reporter: Brandon Williams
>            Assignee: Sylvain Lebresne
>             Fix For: 1.1.1
>
>         Attachments: 4294.txt
>
>
> I've seen this reported quite a few times now:
> {noformat}
> ERROR [main] 2012-05-29 19:33:40,589 AbstractCassandraDaemon.java (line 370) 
> Exception encountered during startup
> java.lang.RuntimeException: 
> org.apache.cassandra.config.ConfigurationException: SimpleStrategy requires a 
> replication_factor strategy option.
>   at org.apache.cassandra.db.Table.<init>(Table.java:275)
>   at org.apache.cassandra.db.Table.open(Table.java:114)
>   at org.apache.cassandra.db.Table.open(Table.java:97)
>   at 
> org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:204)
>   at 
> org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:353)
>   at 
> org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:106)
> Caused by: org.apache.cassandra.config.ConfigurationException: SimpleStrategy 
> requires a replication_factor strategy option.
>   at 
> org.apache.cassandra.locator.SimpleStrategy.validateOptions(SimpleStrategy.java:71)
>   at 
> org.apache.cassandra.locator.AbstractReplicationStrategy.createReplicationStrategy(AbstractReplicationStrategy.java:218)
>   at org.apache.cassandra.db.Table.createReplicationStrategy(Table.java:295)
>   at org.apache.cassandra.db.Table.<init>(Table.java:271)
>   ... 5 more
> {noformat}
> The common thread seems to be old lineage, from at least 0.7.  1.0.x works 
> fine, but upgrading to 1.1 causes the problem.

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