Trino summit 2021: Overview of Trino Pinot Connector, which bridges the flexibility of Trino's full SQL support to the power of Apache Pinot's realtime analytics, giving you the best of both worlds.

1. Real-time Analytics with
Trino and Apache Pinot
Xiang Fu, Elon Azoulay
Oct 22, 2021

2. Speaker Intro
Xiang Fu
● Co-founder - StarTree
● Previously: Streaming Platform @ Uber
● PMC & Committer: Apache Pinot
Elon Azoulay
● Software Engineer - Stealth Mode Startup
● Previously: Data @ Facebook

3. Agenda
● Today’s Compromises: Latency vs. Flexibility
● Not trade-off using Apache Pinot
● Trino Pinot Connector
● Benchmark

4. Today’s Compromises: Latency vs Flexibility

5. Flexibility takes time: Join on the Fly
customers
orders
customers.state =
‘California’ AND
customers.gender
= ‘Female’
JOIN customers ON
(customers.customer_id
= orders.customer_id)
Group By
customers.city,
Month(orders.date)
sum(orders.amount)
FILTER JOIN GROUP BY AGGREGATION
- Flexible to do any computation
- High query cost: disk & network
I/O, Data Partitioning, Data Serde

6. ETL Trade-offs: Pre-joined Table
customers
orders
state =
‘California’
AND gender
= ‘Female’
JOIN customers ON
(customers.customer_id
= orders.customer_id)
Group By city,
Month(orders.
date)
sum(amount)
FILTER
JOIN GROUP BY AGGREGATION
user_orders
_joined
Pre-Joined
Table
- Flexible to explore user dimensions
- Query time is still proportional to the
data scan, not predictable

7. ETL Trade-offs: Pre-aggregated Table
state =
‘California’
AND gender
= ‘Female’
Group By city,
Month(orders.
date)
sum(sum_amount)
FILTER GROUP BY AGGREGATION
user_orders
_joined
Pre-Joined
Table
user_orders_
aggregated
Pre-Aggregated
Table
SELECT
sum(amount) as
sum_amount, date,
city GROUP BY
date, city
Aggregation
+ GroupBy
- Reduced query runtime workload
- Query time is still proportional to the
multiplication of non-groupBy columns

8. ETL Trade-offs: Pre-cubed Table
state =
‘California’
AND gender
= ‘Female’
sum_amount,
month, city
FILTER
user_orders
_joined
Pre-Joined
Table
user_orders
_cubed
Pre-Aggregated
Table
SELECT
sum(amount) as
sum_amount, date,
Month(date) as
month, city
GROUP BY CUBE
(date, city,
Month(date))
Cubing
PROJECTION
- Predictable query runtime
- Storage overhead: one raw record
translates to multiple records
- Dimension explosion

9. Fact Table
Dimension Table Pre-Join Pre-Aggregation Pre-Cube
Latency
Flexibility
low
high
low
high
Not to Trade-off Using Apache Pinot
Throughput high
low

10. User Facing Applications Business Facing Metrics
Apache Pinot Overview
Anomaly Detection
- Ingestion: Millions of events/sec
- Workload: Thousands of queries/sec
- Performance: Millisecond
- Operation: Thousands Nodes Cluster
ADLS
GCS
Real-Time Offline

11. BI Visualization Data Products Anomaly Detection
ADLS
GCS
Real-Time Offline
OLTP
Server1 Server2 Server3
Zookeeper
Broker 1 Broker 2
Controller

12. Secrets Behind Apache Pinot
Scan
Aggregation
Filter
Storage
Bloom
Filter
Inverted Index
Columnar Store
Byte
Encoding
Sorted
Index ❏Common Techniques
❏Pinot
Compression
Star-Tree Pre-aggregation
Star-
Tree
Index
Bit/RLE
Encoding
Per-segment flexible query planning
Range
Index
Text
Index

13. Apache Pinot - StarTree Index
• Configurable trade-off between latency and space by partial pre-aggregation
technique
• Be able to achieve a hard upper bound for query latencies
No pre-computation
Latency
Storage
Full Pre-Cube
(KV Store)
Partial pre-computation
(Startree Index)
T= 10000
T= 100

14. Trino Overview
Source: Trino Architecture

15. BI Visualization Data Products Anomaly Detection Ad hoc Analysis
ADLS
GCS
Trino Pinot Connector

16. Trino Pinot Connector

17. Trino Pinot Connector: Aggregation Pushdown
Chasing the light: Aggregation pushdown
- Issue single Pinot broker request
- Best-effort push down for aggregations like
count/sum/min/max/distinct/approximate_distinct, etc
- 10~100x latency improvement

18. Passthrough Broker Queries
SELECT CASE WHEN team = ‘Giants’ then ‘BIG’ else ‘SMALL’
END AS size, team, count(*) FROM
pinot.default.”SELECT team
FROM baseball_stats WHERE conference = ‘America East’”
GROUP BY CASE WHEN team = ‘Giants’ then ‘BIG’ else
‘SMALL’ END, 2
Group by Expression Support

19. Passthrough Broker Queries
SELECT team, count(*) FROM
pinot.default.”SELECT team, player
FROM baseball_stats WHERE conference = ‘America East’”
ORDER BY CASE WHEN team = ‘Giants’ then ‘BIG’ else
‘SMALL’ END, 2
Order by Expression Support

20. Trino Pinot Connector: Server Query + Pinot Streaming API
Pinot Streaming(gRpc) Connector
- Distributed workload in parallel among Trino workers
- Configurable memory footprint for data pulling from Pinot
- Open the gate of queries requires full table scan or join

21. Ongoing and Future Work on the Connector
● Data Insertion
○ Push segments to the controller
○ Adds or replaces segments.

22. Ongoing and Future Work on the Connector
● Pinot Segments Deletion
● Table & Column Creation/Alter/Drop
CREATE TABLE DIMTABLE
(LONG_COL bigint, STRING_COL varchar)
WITH (
PRIMARY_KEY_COLUMNS = ARRAY['long_col'],
OFFLINE_CONFIG = '{
"tableName": "dimtable",
"tableType": "OFFLINE",
"isDimTable": true,
"segmentsConfig": {
"segmentPushType": "REFRESH",
"replication": "1"
},
"tenants": {
"broker": "DefaultTenant",
"server": "DefaultTenant"
},
"tableIndexConfig": {
"loadMode": "MMAP"
}
}’
);

23. Perf Benchmark
Benchmark Config:
- 1 Pinot Controllers (4 cores/8GB)
- 1 Pinot Brokers (4 cores/8GB)
- 3 Pinot Servers (4 cores/8GB)
- 1 Trino Coordinator (4 cores/8GB)
- 1 Trino Workers (4 cores/8GB)
Data Set:
- 40 Million rows data set
Query:
- Aggregation GroupBy + Predicate
Trino:
- Aggregation Pushdown enable/disable

24. Perf Benchmark
Query Type: Aggregation Group By + Predicate pushdown

25. Thank you
- Getting Started: https://tinyurl.com/trinoPinotTutorial
- Run Trino in Kubernetes: https://github.com/trinodb/charts
- StarTree: https://www.startree.ai/
- Apache Pinot: https://pinot.apache.org/
- Pinot on github: https://github.com/apache/pinot
- Pinot slack: https://tinyurl.com/pinotSlackChannel
- Apache Pinot Twitter: https://twitter.com/ApachePinot
- Apache Pinot Meetup: https://www.meetup.com/apache-pinot
- Starburst: https://www.starburst.io/
- Trino: https://trino.io/
- Trino on github: https://github.com/trinodb/trino
- Trino slack: https://trino.io/slack.html