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https://issues.apache.org/jira/browse/CASSANDRA-4542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13456663#comment-13456663
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Aleksey Yeschenko commented on CASSANDRA-4542:
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bq. updated getBatchlogEndpoints to use TokenMetadata.Topology
This introduced a bug - you have to clone TokenMetadata to get the topology, or 
else getTopology() call throws an AssertionError (assert this != 
StorageService.instance.getTokenMetadata();).
Please apply GET-TOPOLOGY-FIX.patch and push as soon as you can. Otherwise abm 
works.
                
> add atomic_batch_mutate method
> ------------------------------
>
>                 Key: CASSANDRA-4542
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4542
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: API, Core
>            Reporter: Jonathan Ellis
>            Assignee: Aleksey Yeschenko
>             Fix For: 1.2.0 beta 1
>
>         Attachments: 4542-diff.txt, 4542-v4.txt, 4542-v5.patch, 
> CASSANDRA-4542-4543-4544-v3.patch, GET-TOPOLOGY-FIX.patch
>
>
> atomic_batch_mutate will have the same parameters as batch_mutate, but will 
> write to the batchlog before attempting distribution to the batch rows' 
> replicas.

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