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From "Tyler Hobbs (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-8225) Production-capable COPY FROM
Date Fri, 31 Oct 2014 17:16:34 GMT


Tyler Hobbs commented on CASSANDRA-8225:

Between using batches for inserts (in the same partition) and using multiple processes for
loading (which is very easy in python) it would be quite easy to get a 5 to 10x speedup with
relatively little work.  That should get us down to 10 to 20s for this load.  That's not as
fast as the mysql load, but it's in the realm of being "good enough", and the machinery would
be simple.

> Production-capable COPY FROM
> ----------------------------
>                 Key: CASSANDRA-8225
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Tools
>            Reporter: Jonathan Ellis
>             Fix For: 2.1.2
> Via [~schumacr],
> bq. I pulled down a sourceforge data generator and created a moc file of 500,000 rows
that had an incrementing sequence number, date, and SSN. I then used our COPY command and
MySQL's LOAD DATA INFILE to load the file on my Mac. Results were: 
> {noformat}
> mysql> load data infile '/Users/robin/dev/datagen3.txt'  into table p_test  fields
terminated by ',';
> Query OK, 500000 rows affected (2.18 sec)
> {noformat}
> C* 2.1.0 (pre-CASSANDRA-7405)
> {noformat}
> cqlsh:dev> copy p_test from '/Users/robin/dev/datagen3.txt' with delimiter=',';
> 500000 rows imported in 16 minutes and 45.485 seconds.
> {noformat}
> Cassandra 2.1.1:
> {noformat}
> cqlsh:dev> copy p_test from '/Users/robin/dev/datagen3.txt' with delimiter=',';
> Processed 500000 rows; Write: 4037.46 rows/s
> 500000 rows imported in 2 minutes and 3.058 seconds.
> {noformat}
> [jbellis] 7405 gets us almost an order of magnitude improvement.  Unfortunately we're
still almost 2 orders slower than mysql.
> I don't think we can continue to tell people, "use sstableloader instead."  The number
of users sophisticated enough to use the sstable writers is small and (relatively) decreasing
as our user base expands.

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