[CASSANDRA-1774] ColumnFamilyOutputFormat only writes one column (per key)

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 0.7.0 rc 2
• Severity: Normal
• Assignee: Michael Semb Wever
• Reporter: Michael Semb Wever

Authors

Michael Semb Wever

Reviewers

Jonathan Ellis

• Created: 24/Nov/10 12:17
• Updated: 16/Apr/19 09:33
• Resolved: 25/Nov/10 17:24

Description

From mailing list http://thread.gmane.org/gmane.comp.db.cassandra.user/10385

ColumnFamilyOutputFormat will only write out one column
per key.

Alex Burkoff also reported this nearly two months ago, but nobody ever
replied...
http://article.gmane.org/gmane.comp.db.cassandra.user/9325

has anyone any ideas?
should it be possible to write multiple columns out?

This is very easy to reproduce. Use the contrib/wordcount example, with
OUTPUT_REDUCER=cassandra and in WordCount.java add at line 132

> results.add(getMutation(key, sum));
> + results.add(getMutation(new Text("doubled"), sum*2));

Only the last mutation for any key seems to be written.