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https://issues.apache.org/jira/browse/CASSANDRA-11138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16806292#comment-16806292
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mck commented on CASSANDRA-11138:
---------------------------------
[~alwyn], presuming this bug still an issue post- CASSANDRA-12490 ?
I did a quick test. In 3.9, 3.10 and 3.11.x, with the schema you describe
above, I got 30 rows in one partition, which is not the same as the 10 you got
in one partition (although you got 30 across 3). Applying the patch gave me 390
rows per partition.
[~benedict], [~Stefania], I had trouble following the conversation in
CASSANDRA-12490, are the concerns there relevant to this patch?
> cassandra-stress tool - clustering key values not distributed
> -------------------------------------------------------------
>
> Key: CASSANDRA-11138
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11138
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Tools
> Environment: Cassandra 2.2.4, Centos 6.5, Java 8
> Reporter: Ralf Steppacher
> Assignee: Alwyn Davis
> Priority: Normal
> Labels: stress
> Attachments: 11138-trunk.patch
>
>
> I am trying to get the stress tool to generate random values for three
> clustering keys. I am trying to simulate collecting events per user id (text,
> partition key). Events have a session type (text), event type (text), and
> creation time (timestamp) (clustering keys, in that order). For testing
> purposes I ended up with the following column spec:
> {noformat}
> columnspec:
> - name: created_at
> cluster: uniform(10..10)
> - name: event_type
> size: uniform(5..10)
> population: uniform(1..30)
> cluster: uniform(1..30)
> - name: session_type
> size: fixed(5)
> population: uniform(1..4)
> cluster: uniform(1..4)
> - name: user_id
> size: fixed(15)
> population: uniform(1..1000000)
> - name: message
> size: uniform(10..100)
> population: uniform(1..100B)
> {noformat}
> My expectation was that this would lead to anywhere between 10 and 1200 rows
> to be created per partition key. But it seems that exactly 10 rows are being
> created, with the {{created_at}} timestamp being the only variable that is
> assigned variable values (per partition key). The {{session_type}} and
> {{event_type}} variables are assigned fixed values. This is even the case if
> I set the cluster distribution to uniform(30..30) and uniform(4..4)
> respectively. With this setting I expected 1200 rows per partition key to be
> created, as announced when running the stress tool, but it is still 10.
> {noformat}
> [rsteppac@centos bin]$ ./cassandra-stress user
> profile=../batch_too_large.yaml ops\(insert=1\) -log level=verbose
> file=~/centos_eventy_patient_session_event_timestamp_insert_only.log -node
> 10.211.55.8
> …
> Created schema. Sleeping 1s for propagation.
> Generating batches with [1..1] partitions and [1..1] rows (of [1200..1200]
> total rows in the partitions)
> Improvement over 4 threadCount: 19%
> ...
> {noformat}
> Sample of generated data:
> {noformat}
> cqlsh> select user_id, event_type, session_type, created_at from
> stresscql.batch_too_large LIMIT 30 ;
> user_id | event_type | session_type | created_at
> -----------------------------+------------------+--------------+--------------------------
> %\x7f\x03/.d29<i\$u\x114 | Y ?\x1eR|\x13\t| | P+|u\x0b | 2012-10-19
> 08:14:11+0000
> %\x7f\x03/.d29<i\$u\x114 | Y ?\x1eR|\x13\t| | P+|u\x0b | 2004-11-08
> 04:04:56+0000
> %\x7f\x03/.d29<i\$u\x114 | Y ?\x1eR|\x13\t| | P+|u\x0b | 2002-10-15
> 00:39:23+0000
> %\x7f\x03/.d29<i\$u\x114 | Y ?\x1eR|\x13\t| | P+|u\x0b | 1999-08-31
> 19:56:30+0000
> %\x7f\x03/.d29<i\$u\x114 | Y ?\x1eR|\x13\t| | P+|u\x0b | 1999-04-02
> 20:46:26+0000
> %\x7f\x03/.d29<i\$u\x114 | Y ?\x1eR|\x13\t| | P+|u\x0b | 1990-10-08
> 03:27:17+0000
> %\x7f\x03/.d29<i\$u\x114 | Y ?\x1eR|\x13\t| | P+|u\x0b | 1984-03-31
> 23:30:34+0000
> %\x7f\x03/.d29<i\$u\x114 | Y ?\x1eR|\x13\t| | P+|u\x0b | 1975-11-16
> 02:41:28+0000
> %\x7f\x03/.d29<i\$u\x114 | Y ?\x1eR|\x13\t| | P+|u\x0b | 1970-04-07
> 07:23:48+0000
> %\x7f\x03/.d29<i\$u\x114 | Y ?\x1eR|\x13\t| | P+|u\x0b | 1970-03-08
> 23:23:04+0000
> N!\x0eUA7^r7d\x06J<v< | \x1bm/c/Th\x07U | E}P^k | 2015-10-12
> 17:48:51+0000
> N!\x0eUA7^r7d\x06J<v< | \x1bm/c/Th\x07U | E}P^k | 2010-10-28
> 06:21:13+0000
> N!\x0eUA7^r7d\x06J<v< | \x1bm/c/Th\x07U | E}P^k | 2005-06-28
> 03:34:41+0000
> N!\x0eUA7^r7d\x06J<v< | \x1bm/c/Th\x07U | E}P^k | 2005-01-29
> 05:26:21+0000
> N!\x0eUA7^r7d\x06J<v< | \x1bm/c/Th\x07U | E}P^k | 2003-03-27
> 01:31:24+0000
> N!\x0eUA7^r7d\x06J<v< | \x1bm/c/Th\x07U | E}P^k | 2002-03-29
> 14:22:43+0000
> N!\x0eUA7^r7d\x06J<v< | \x1bm/c/Th\x07U | E}P^k | 2000-06-15
> 14:54:29+0000
> N!\x0eUA7^r7d\x06J<v< | \x1bm/c/Th\x07U | E}P^k | 1998-03-08
> 13:31:54+0000
> N!\x0eUA7^r7d\x06J<v< | \x1bm/c/Th\x07U | E}P^k | 1988-01-21
> 06:38:40+0000
> N!\x0eUA7^r7d\x06J<v< | \x1bm/c/Th\x07U | E}P^k | 1975-08-03
> 21:16:47+0000
> oy\x1c0077H"i\x07\x13_%\x06 | | \nz@Qj\x1cB | E}P^k | 2014-11-23
> 17:05:45+0000
> oy\x1c0077H"i\x07\x13_%\x06 | | \nz@Qj\x1cB | E}P^k | 2012-02-23
> 23:20:54+0000
> oy\x1c0077H"i\x07\x13_%\x06 | | \nz@Qj\x1cB | E}P^k | 2012-02-19
> 12:05:15+0000
> oy\x1c0077H"i\x07\x13_%\x06 | | \nz@Qj\x1cB | E}P^k | 2005-10-17
> 04:22:45+0000
> oy\x1c0077H"i\x07\x13_%\x06 | | \nz@Qj\x1cB | E}P^k | 2003-02-24
> 19:45:06+0000
> oy\x1c0077H"i\x07\x13_%\x06 | | \nz@Qj\x1cB | E}P^k | 1996-12-18
> 06:18:31+0000
> oy\x1c0077H"i\x07\x13_%\x06 | | \nz@Qj\x1cB | E}P^k | 1991-06-10
> 22:07:45+0000
> oy\x1c0077H"i\x07\x13_%\x06 | | \nz@Qj\x1cB | E}P^k | 1983-05-05
> 12:29:09+0000
> oy\x1c0077H"i\x07\x13_%\x06 | | \nz@Qj\x1cB | E}P^k | 1972-04-17
> 21:24:52+0000
> oy\x1c0077H"i\x07\x13_%\x06 | | \nz@Qj\x1cB | E}P^k | 1971-05-09
> 23:00:02+0000
> (30 rows)
> cqlsh>
> {noformat}
> If I remove the {{created_at}} clustering key, then the other two clustering
> keys are being assigned variable values per partition key.
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