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:
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)
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(1..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.
[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%
...
Sample of generated data:
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>
If I remove the created_at clustering keys then the other two clustering keys
are assigned variable values per partition key.
Is there a way to achieve this with the created_at clustering key being present?
Thanks!
Ralf
