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https://issues.apache.org/jira/browse/CASSANDRA-7774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14102139#comment-14102139
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Jacek Lewandowski commented on CASSANDRA-7774:
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[~alexliu68] could you review version 2?
> CqlRecordReader creates wrong cluster if the first replica of a split is down
> -----------------------------------------------------------------------------
>
> Key: CASSANDRA-7774
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7774
> Project: Cassandra
> Issue Type: Bug
> Components: Hadoop
> Reporter: Jacek Lewandowski
> Assignee: Jacek Lewandowski
> Attachments:
> 0001-CASSANDRA-7774-Fixed-cluster-initialisation-for-a-sp.patch,
> CASSANDRA-7774-patch-v2.patch
>
>
> For a given split, {{CqlRecordReader}} gets a list of replicas of that split.
> Then, it tries to create a Cluster object with a ClusterBuilder for each
> replica separately in a loop, so that if the cluster creation fails for a
> certain replica, the next replica is tried. Unfortunately it does not work,
> because the cluster creation does not fail if the provided contact point is
> down. So, it always selects the first replica regardless of its state.
> The solution is quite simple - {{ClusterBuilder}} accepts a collection of
> contact points - at least one of them must be up. So instead of iterating
> over the replicas we can pass the whole set of them and the driver will
> select the working one. It will follow some changes in the load balancing
> policy - I'm going to switch to use -the same- similar balancing policy -as-
> to the one we use in OSS Spark Connector.
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