I have raised https://issues.apache.org/jira/browse/CASSANDRA-11105 <https://issues.apache.org/jira/browse/CASSANDRA-11105>.
Thanks! Ralf > On 01.02.2016, at 15:01, Jake Luciani <jak...@gmail.com> wrote: > > Yeah that looks like a bug. Can you open a JIRA and attach the full .yaml? > > Thanks! > > > On Mon, Feb 1, 2016 at 5:09 AM, Ralf Steppacher <ralf.viva...@gmail.com > <mailto:ralf.viva...@gmail.com>> wrote: > I am using Cassandra 2.2.4 and I am struggling to get the cassandra-stress > tool to work for my test scenario. I have followed the example on > http://www.datastax.com/dev/blog/improved-cassandra-2-1-stress-tool-benchmark-any-schema > > <http://www.datastax.com/dev/blog/improved-cassandra-2-1-stress-tool-benchmark-any-schema> > to create a yaml file describing my test. > > I am 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). Plus some more attributes required for > rendering the events in a UI. For testing purposes I ended up with the > following column spec and insert distribution: > > columnspec: > - name: created_at > cluster: uniform(10..10000) > - 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) > > insert: > partitions: fixed(1) > batchtype: UNLOGGED > select: fixed(1)/1200000 > > > Running stress tool for just the insert prints > > Generating batches with [1..1] partitions and [0..1] rows (of [10..1200000] > total rows in the partitions) > > and then immediately starts flooding me with > "com.datastax.driver.core.exceptions.InvalidQueryException: Batch too large”. > > Why I should be exceeding the "batch_size_fail_threshold_in_kb: 50” in the > cassandra.yaml I do not understand. My understanding is that the stress tool > should generate one row per batch. The size of a single row should not exceed > 8+10*3+5*3+15*3+100*3 = 398 bytes. Assuming a worst case of all text > characters being 3 byte unicode characters. > > How come I end up with batches that exceed the 50kb threshold? Am I missing > the point about the “select” attribute? > > > Thanks! > Ralf > > > > -- > http://twitter.com/tjake <http://twitter.com/tjake>
