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https://issues.apache.org/jira/browse/CASSANDRA-7793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15390281#comment-15390281
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Jonathan Ellis commented on CASSANDRA-7793:
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[~Stefania], I think COPY does this now?
> Utilize BATCH statements in COPY FROM
> -------------------------------------
>
> Key: CASSANDRA-7793
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7793
> Project: Cassandra
> Issue Type: Improvement
> Components: Tools
> Reporter: Mikhail Stepura
> Priority: Minor
> Labels: cqlsh
> Fix For: 2.1.x
>
>
> If we assume that a significant subset of COPY FROM csv's are going to be
> results of COPY TO command, then rows will be grouped by the partition key.
> In that case we'd win from batching (until another partition key is met, and
> constrained by some limit of rows per batch, we don't want huge batches)
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