Piotr Kołaczkowski created CASSANDRA-4588:
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Summary: CQL COPY ... FROM command is slow
Key: CASSANDRA-4588
URL: https://issues.apache.org/jira/browse/CASSANDRA-4588
Project: Cassandra
Issue Type: Bug
Components: Tools
Affects Versions: 1.1.4
Environment: Ubuntu Linux 12.04, kernel 3.4.0
Reporter: Piotr Kołaczkowski
1. created a csv file with 10,000,000 rows with two integer columns; saved it
to an SSD disk, it took a few seconds, the file is 184 MB large.
2. started a single local cassandra node from fresh empty data and commit log
dirs
3. created a keyspace with simple strategy and RF=1
4. loading the file with COPY ... FROM command - it is over 15 minutes now and
still loading
top reports about 50% CPU usage for java (cassandra) and 50% for python.
I/O is almost idle, iowait < 0.1%.
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