[CASSANDRA-8225] Production-capable COPY FROM

• Type: New Feature
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.1.5
• Component/s: Legacy/Tools
• Labels: cqlsh
• Assignee: Tom Hobbs
• Reporter: Jonathan Ellis

Authors

Tom Hobbs

Reviewers

Aleksey Yeschenko

• Created: 30/Oct/14 22:19
• Updated: 16/Apr/19 09:31
• Resolved: 20/Mar/15 15:32

Description

Via schumacr,

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:

mysql> load data infile '/Users/robin/dev/datagen3.txt'  into table p_test  fields terminated by ',';
Query OK, 500000 rows affected (2.18 sec)

C* 2.1.0 (pre-CASSANDRA-7405)

cqlsh:dev> copy p_test from '/Users/robin/dev/datagen3.txt' with delimiter=',';
500000 rows imported in 16 minutes and 45.485 seconds.

Cassandra 2.1.1:

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.

[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.

Issue Links

• relates to: CASSANDRA-8234 CTAS (CREATE TABLE AS SELECT)
• relates to: CASSANDRA-8233 Additional file handling capabilities for COPY FROM