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https://issues.apache.org/jira/browse/CASSANDRA-14742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16617589#comment-16617589
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Alex Petrov commented on CASSANDRA-14742:
-----------------------------------------
We're picking batchlog CL of {{ONE}} or {{TWO}} since the logic in
{{BatchlogManager#EndpointFilter}} allows either one node (local, in case of
single-node data centers), or two replicas from different racks.
> Race Condition in batchlog replica collection
> ---------------------------------------------
>
> Key: CASSANDRA-14742
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14742
> Project: Cassandra
> Issue Type: Bug
> Reporter: Alex Petrov
> Assignee: Alex Petrov
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When we collect nodes for it in {{StorageProxy#getBatchlogReplicas}}, we
> already filter out down replicas; subsequently they get picked up and taken
> for liveAndDown.
> There's a possible race condition due to picking tokens from token metadata
> twice (once in {{StorageProxy#getBatchlogReplicas}} and second one in
> {{ReplicaPlan#forBatchlogWrite}})
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