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https://issues.apache.org/jira/browse/CASSANDRA-15953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17163818#comment-17163818
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Yifan Cai commented on CASSANDRA-15953:
---------------------------------------

bq. system.batches uses LocalPartitioner so if you run an auto-discovery diff 
without excluding system, you get a bunch of errors

That is very good point. Thanks for bringing it up. 

Would you like to take another look at the PR? Now the system keyspaces are 
always excluded. 

> Support fetching all user tables to compare in Cassandra-diff
> -------------------------------------------------------------
>
>                 Key: CASSANDRA-15953
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15953
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tool/diff
>            Reporter: Yifan Cai
>            Assignee: Yifan Cai
>            Priority: Normal
>              Labels: pull-request-available
>
> The spark diff job may fail to launch with kernel error "E2BIG: Argument list 
> too long", when passing a large list of keyspace table list to compare. 
> Proposing a mode to fetch all user tables from the clusters to be compared. 
> When the mode is on, the spark job ignores the parameter "keyspace_tables".



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