Druid vs Rockset Revisited

by Alan Li · in Solutions · March 5, 2021

Rockset recently published a blog post that compared the performance of Apache Druid 0.18 versus Rockset using the SSB benchmark. Druid 0.18 is about 9 months out of date at this point, so we wanted to revisit the benchmark based on the latest version of Druid (0.20.1), which includes several performance improvements we’ve been doing over the last few months.

Our findings are below:

Query Imply3.3.0 Imply 2021.02 Rockset
Q1.1 1245 462 944
Q1.2 155 154 254
Q1.3 92 160 296
Q2.1 662 139 161
Q2.2 591 102 136
Q2.3 319 79 129
Q3.1 292 333 626
Q3.2 514 102 598
Q3.3 417 91 343
Q3.4 100 72 32
Q4.1 883 179 384
Q4.2 389 109 132
Q4.3 384 87 41
6043 2069 4076

We can see a remarkable improvement in performance with the latest version of Druid. Two main things drove most of the change:

1) Many of these queries in the SSB benchmark use expressions. In older versions of Druid, we did not have vectorized expressions implemented, so many of the queries couldn’t vectorize. In the latest version, 100% of these queries vectorize.

2) The schema used to ingest data was changed to match what Rockset is doing. Similar to how Rockset “specified some keys for column-based clustering”, we also used column based clustering (in Druid it’s called partitioning). No further tuning was done in Druid.

In our next release of Druid, we are releasing another set of performance improvements. Stay tuned for more information.

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