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From "Adam Holmberg (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-9302) Optimize cqlsh COPY FROM, part 3
Date Tue, 15 Dec 2015 15:34:46 GMT


Adam Holmberg commented on CASSANDRA-9302:

bq. We need to batch by replica rather than just by partition key as the scope is much wider.
Right, I was forgetting about that optimization. I'm now surprised by this:
bq. I've repeated the tests today with pk batching rather than replica batching and it shaved
another 6 seconds.
Is this with a similar distribution of PKs? RF < N? Would it hold for a non-local cluster
where the round trip is not negligible?

Now looking at changes around ingest rate.

> Optimize cqlsh COPY FROM, part 3
> --------------------------------
>                 Key: CASSANDRA-9302
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Jonathan Ellis
>            Assignee: Stefania
>            Priority: Critical
>             Fix For: 2.1.x
> We've had some discussion moving to Spark CSV import for bulk load in 3.x, but people
need a good bulk load tool now.  One option is to add a separate Java bulk load tool (CASSANDRA-9048),
but if we can match that performance from cqlsh I would prefer to leave COPY FROM as the preferred
option to which we point people, rather than adding more tools that need to be supported indefinitely.
> Previous work on COPY FROM optimization was done in CASSANDRA-7405 and CASSANDRA-8225.

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