Data Warehousing with Spark Streaming at Zalando

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Zalandos AI-driven products and distributed landscape of analytical data marts cannot wait for long-running, hard-to-recover, monolithic batch jobs taking all night to calculate already outdated data. Modern data integration pipelines need to deliver fast and easy to consume data sets in high quality. Based on Spark Streaming and Delta, the central data warehousing team was able to deliver widely-used master data as S3 or Kafka streams and snapshots at the same time. The talk will cover challenges in our fashion data platform and a detailed architectural deep dive about separation of integration from enrichment, providing streams as well as snapshots and feeding the data to distributed data marts. Finally, lessons learned and best practices about Delta’s MERGE command, Scala API vs Spark SQL and schema evolution give more insights and guidance for similar use cases.

Daten & Analysen

WIFI SSID:Spark+AISummit | Password: UnifiedDataAnalytics

Sebastian Herold, Zalando SE
Data Warehousing with
Spark Streaming @
Zalando
#UnifiedDataAnalytics #SparkAISummit

3
# Principal Data Engineer / Architect
# 7y @ Immo-/Scout24
# DataDevOps Manifesto
# Data Platform
# 2y @ Zalando
# ML Productivity
# Streaming DWH
@heroldamus
Data Warehousing with Spark Streaming
Sebastian Herold

4
WE BRING FASHION TO PEOPLE
2008-2009
2010
2012-2013
2011
2018
17 markets
9 fulfillment centers
>28M active customers
5.4B revenue 2018
>300M visits/month
>14k employees
>400k product choices
>80% visits from mobile

5
TECH@SCALE
Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19
>350 accounts
>100 clusters
>250 teams
>5 data lakes
API
>800 micro services

WHY OUR CENTRAL DWH
DOES NOT SUCCEED
ANYMORE?

HEAVY INTEGRATION OF
UNSTRUCTURED DATA
INTO RELATIONAL TABLES
DRAWBACKS OF CENTRAL DWH

DATASETS ARE NEEDED
DISTRIBUTED
DRAWBACKS OF CENTRAL DWH

LOWER LATENCY REQUIRED BY
AI USE-CASES,
OTHER DATA WAREHOUSES,
NEAR-REALTIME USE-CASES
DRAWBACKS OF CENTRAL DWH

MULTIPLE TEAMS DO SAME
LOW-LATENCY EVENT INTEGRATION
DRAWBACKS OF CENTRAL DWH

HEAVY INTEGRATION OF
UNSTRUCTURED DATA
INTO RELATIONAL TABLES
DATASETS ARE NEEDED
DISTRIBUTED
LOWER LATENCY REQUIRED BY
AI USE-CASES,
OTHER DATA WAREHOUSES,
NEAR-REALTIME USE-CASES
MULTIPLE TEAMS DO SAME
LOW-LATENCY EVENT
INTEGRATION
STREAMING

12
SALES ORDER EXAMPLE
Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19
order.created
order_id,
order_date,
items,
...
shipment.created
order_id,
shipping_date,
shipped_items,
...
payment.done
payment_id,
payment_date,
order_id,
...
item.returned
order_id,
return_date,
returned_item,
...
sales-order
order_id,
order_date,
payment_id,
payment_date,
items:
shipped_at,
returned_at,
...
calculated_1,
calculated_2
...

13
HOW WE STARTED?
Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19
Topics
Streaming
S3
nakadi.io
S3 Delta Table
WAIT!
Downstream

14
INTEGRATION OF HISTORIC DATA
Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19
Topics
Streaming
S3
nakadi.io
S3 Delta TableCentral
DWH Bootstrap
Delta Table
BOOM!
Batch time increased
to 2h !!
MERGE command
slow for needles in
the haystack
Downstream

15
INTRODUCE SNAPSHOTS AND CHANGES TABLE
Topics
Streaming
S3
nakadi.io
S3Central
DWH Bootstrap
Delta Table
Downstream
Snapshot Changes
Snapshotter
Better, but still slow!

16
LOAD SNAPSHOT INTO CLUSTER
Topics
Streaming
S3
nakadi.io
S3Central
DWH Bootstrap Downstream
Snapshot Changes
Snapshotter
Snapshot

17
WHAT’S COMING NEXT?
Topics
Streaming
S3
nakadi.io
Central
DWH Bootstrap Downstream
Snapshotter
S3 Snapshot Changes
Snapshot
Changes
State
Store
???
Snapshotter

18 Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19
SQL vs SCALA
# Started with 200 lines of SQL
# Grew fast to 400 lines
# Violated DRY principle
# Hard to unit-test
# Hard to refactor
# Bad support for nested structures
SCALA

19
LESSONS LEARNED
Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19
# Streaming needs different thinking
# DWH ~ Backend Programming
# Don’t start with SQL because it’s easy
# Databricks Delta succeeds Parquet
# Make sure all data is available in S3

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In this talk, I would like to introduce an open-source tool built by our team that simplifies the data conversion from Apache Spark to deep learning frameworks. Imagine you have a large dataset, say 20 GBs, and you want to use it to train a TensorFlow model. Before feeding the data to the model, you need to clean and preprocess your data using Spark. Now you have your dataset in a Spark DataFrame. When it comes to the training part, you may have the problem: How can I convert my Spark DataFrame to some format recognized by my TensorFlow model? The existing data conversion process can be tedious. For example, to convert an Apache Spark DataFrame to a TensorFlow Dataset file format, you need to either save the Apache Spark DataFrame on a distributed filesystem in parquet format and load the converted data with third-party tools such as Petastorm, or save it directly in TFRecord files with spark-tensorflow-connector and load it back using TFRecordDataset. Both approaches take more than 20 lines of code to manage the intermediate data files, rely on different parsing syntax, and require extra attention for handling vector columns in the Spark DataFrames. In short, all these engineering frictions greatly reduced the data scientists’ productivity. The Databricks Machine Learning team contributed a new Spark Dataset Converter API to Petastorm to simplify these tedious data conversion process steps. With the new API, it takes a few lines of code to convert a Spark DataFrame to a TensorFlow Dataset or a PyTorch DataLoader with default parameters. In the talk, I will use an example to show how to use the Spark Dataset Converter to train a Tensorflow model and how simple it is to go from single-node training to distributed training on Databricks.

Simplify Data Conversion from Spark to TensorFlow and PyTorch

Databricks

There is no doubt Kubernetes has emerged as the next generation of cloud native infrastructure to support a wide variety of distributed workloads. Apache Spark has evolved to run both Machine Learning and large scale analytics workloads. There is growing interest in running Apache Spark natively on Kubernetes. By combining the flexibility of Kubernetes and scalable data processing with Apache Spark, you can run any data and machine pipelines on this infrastructure while effectively utilizing resources at disposal. In this talk, Rajesh Thallam and Sougata Biswas will share how to effectively run your Apache Spark applications on Google Kubernetes Engine (GKE) and Google Cloud Dataproc, orchestrate the data and machine learning pipelines with managed Apache Airflow on GKE (Google Cloud Composer). Following topics will be covered: – Understanding key traits of Apache Spark on Kubernetes- Things to know when running Apache Spark on Kubernetes such as autoscaling- Demonstrate running analytics pipelines on Apache Spark orchestrated with Apache Airflow on Kubernetes cluster.

Scaling your Data Pipelines with Apache Spark on Kubernetes

Databricks

Pipelines have become ubiquitous, as the need for stringing multiple functions to compose applications has gained adoption and popularity. Common pipeline abstractions such as “fit” and “transform” are even shared across divergent platforms such as Python Scikit-Learn and Apache Spark. Scaling pipelines at the level of simple functions is desirable for many AI applications, however is not directly supported by Ray’s parallelism primitives. In this talk, Raghu will describe a pipeline abstraction that takes advantage of Ray’s compute model to efficiently scale arbitrarily complex pipeline workflows. He will demonstrate how this abstraction cleanly unifies pipeline workflows across multiple platforms such as Scikit-Learn and Spark, and achieves nearly optimal scale-out parallelism on pipelined computations. Attendees will learn how pipelined workflows can be mapped to Ray’s compute model and how they can both unify and accelerate their pipelines with Ray.

Scaling and Unifying SciKit Learn and Apache Spark Pipelines

Databricks

In this talk about zipline, we will introduce a new type of windowing construct called a sawtooth window. We will describe various properties about sawtooth windows that we utilize to achieve online-offline consistency, while still maintaining high-throughput, low-read latency and tunable write latency for serving machine learning features.We will also talk about a simple deployment strategy for correcting feature drift – due operations that are not “abelian groups”, that operate over change data.

Sawtooth Windows for Feature Aggregations

Databricks

We want to present multiple anti patterns utilizing Redis in unconventional ways to get the maximum out of Apache Spark.All examples presented are tried and tested in production at Scale at Adobe. The most common integration is spark-redis which interfaces with Redis as a Dataframe backing Store or as an upstream for Structured Streaming. We deviate from the common use cases to explore where Redis can plug gaps while scaling out high throughput applications in Spark. Niche 1 : Long Running Spark Batch Job – Dispatch New Jobs by polling a Redis Queue · Why? o Custom queries on top a table; We load the data once and query N times · Why not Structured Streaming · Working Solution using Redis Niche 2 : Distributed Counters · Problems with Spark Accumulators · Utilize Redis Hashes as distributed counters · Precautions for retries and speculative execution · Pipelining to improve performance

Redis + Apache Spark = Swiss Army Knife Meets Kitchen Sink

Databricks

In the era of microservices, decentralized ML architectures and complex data pipelines, data quality has become a bigger challenge than ever. When data is involved in complex business processes and decisions, bad data can, and will, affect the bottom line. As a result, ensuring data quality across the entire ML pipeline is both costly, and cumbersome while data monitoring is often fragmented and performed ad hoc. To address these challenges, we built whylogs, an open source standard for data logging. It is a lightweight data profiling library that enables end-to-end data profiling across the entire software stack. The library implements a language and platform agnostic approach to data quality and data monitoring. It can work with different modes of data operations, including streaming, batch and IoT data. In this talk, we will provide an overview of the whylogs architecture, including its lightweight statistical data collection approach and various integrations. We will demonstrate how the whylogs integration with Apache Spark achieves large scale data profiling, and we will show how users can apply this integration into existing data and ML pipelines.

Re-imagine Data Monitoring with whylogs and Spark

Databricks

Machine learning (ML) models are typically part of prediction queries that consist of a data processing part (e.g., for joining, filtering, cleaning, featurization) and an ML part invoking one or more trained models. In this presentation, we identify significant and unexplored opportunities for optimization. To the best of our knowledge, this is the first effort to look at prediction queries holistically, optimizing across both the ML and SQL components. We will present Raven, an end-to-end optimizer for prediction queries. Raven relies on a unified intermediate representation that captures both data processing and ML operators in a single graph structure. This allows us to introduce optimization rules that (i) reduce unnecessary computations by passing information between the data processing and ML operators (ii) leverage operator transformations (e.g., turning a decision tree to a SQL expression or an equivalent neural network) to map operators to the right execution engine, and (iii) integrate compiler techniques to take advantage of the most efficient hardware backend (e.g., CPU, GPU) for each operator. We have implemented Raven as an extension to Spark’s Catalyst optimizer to enable the optimization of SparkSQL prediction queries. Our implementation also allows the optimization of prediction queries in SQL Server. As we will show, Raven is capable of improving prediction query performance on Apache Spark and SQL Server by up to 13.1x and 330x, respectively. For complex models, where GPU acceleration is beneficial, Raven provides up to 8x speedup compared to state-of-the-art systems. As part of the presentation, we will also give a demo showcasing Raven in action.

Raven: End-to-end Optimization of ML Prediction Queries

Databricks

Semantic segmentation is the classification of every pixel in an image/video. The segmentation partitions a digital image into multiple objects to simplify/change the representation of the image into something that is more meaningful and easier to analyze [1][2]. The technique has a wide variety of applications ranging from perception in autonomous driving scenarios to cancer cell segmentation for medical diagnosis. Exponential growth in the datasets that require such segmentation is driven by improvements in the accuracy and quality of the sensors generating the data extending to 3D point cloud data. This growth is further compounded by exponential advances in cloud technologies enabling the storage and compute available for such applications. The need for semantically segmented datasets is a key requirement to improve the accuracy of inference engines that are built upon them. Streamlining the accuracy and efficiency of these systems directly affects the value of the business outcome for organizations that are developing such functionalities as a part of their AI strategy. This presentation details workflows for labeling, preprocessing, modeling, and evaluating performance/accuracy. Scientists and engineers leverage domain-specific features/tools that support the entire workflow from labeling the ground truth, handling data from a wide variety of sources/formats, developing models and finally deploying these models. Users can scale their deployments optimally on GPU-based cloud infrastructure to build accelerated training and inference pipelines while working with big datasets. These environments are optimized for engineers to develop such functionality with ease and then scale against large datasets with Spark-based clusters on the cloud.

Processing Large Datasets for ADAS Applications using Apache Spark

Databricks

At Adobe Experience Platform, we ingest TBs of data every day and manage PBs of data for our customers as part of the Unified Profile Offering. At the heart of this is a bunch of complex ingestion of a mix of normalized and denormalized data with various linkage scenarios power by a central Identity Linking Graph. This helps power various marketing scenarios that are activated in multiple platforms and channels like email, advertisements etc. We will go over how we built a cost effective and scalable data pipeline using Apache Spark and Delta Lake and share our experiences. What are we storing? Multi Source – Multi Channel Problem Data Representation and Nested Schema Evolution Performance Trade Offs with Various formats Go over anti-patterns used (String FTW) Data Manipulation using UDFs Writer Worries and How to Wipe them Away Staging Tables FTW Datalake Replication Lag Tracking Performance Time!

Massive Data Processing in Adobe Using Delta Lake

Databricks

Detecting advanced email attacks at scale is a challenging ML problem, particularly due to the rarity of attacks, adversarial nature of the problem, and scale of data. In order to move quickly and adapt to the newest threat we needed to build a Continuous Integration / Continuous Delivery pipeline for the entire ML detection stack. Our goal is to enable detection engineers and data scientists to make changes to any part of the stack including joined datasets for hydration, feature extraction code, detection logic, and develop/train ML models. In this talk, we discuss why we decided to build this pipeline, how it is used to accelerate development and ensure quality, and dive into the nitty-gritty details of building such a system on top of an Apache Spark + Databricks stack.

Machine Learning CI/CD for Email Attack Detection

Databricks

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Data Warehousing with Spark Streaming at Zalando

1. WIFI SSID:Spark+AISummit | Password: UnifiedDataAnalytics

2. Sebastian Herold, Zalando SE Data Warehousing with Spark Streaming @ Zalando #UnifiedDataAnalytics #SparkAISummit

3. 3 # Principal Data Engineer / Architect # 7y @ Immo-/Scout24 # DataDevOps Manifesto # Data Platform # 2y @ Zalando # ML Productivity # Streaming DWH @heroldamus Data Warehousing with Spark Streaming Sebastian Herold

4. 4 WE BRING FASHION TO PEOPLE 2008-2009 2010 2012-2013 2011 2018 17 markets 9 fulfillment centers >28M active customers 5.4B revenue 2018 >300M visits/month >14k employees >400k product choices >80% visits from mobile

5. 5 TECH@SCALE Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19 >350 accounts >100 clusters >250 teams >5 data lakes API >800 micro services

6. WHY OUR CENTRAL DWH DOES NOT SUCCEED ANYMORE?

7. HEAVY INTEGRATION OF UNSTRUCTURED DATA INTO RELATIONAL TABLES DRAWBACKS OF CENTRAL DWH

8. DATASETS ARE NEEDED DISTRIBUTED DRAWBACKS OF CENTRAL DWH

9. LOWER LATENCY REQUIRED BY AI USE-CASES, OTHER DATA WAREHOUSES, NEAR-REALTIME USE-CASES DRAWBACKS OF CENTRAL DWH

10. MULTIPLE TEAMS DO SAME LOW-LATENCY EVENT INTEGRATION DRAWBACKS OF CENTRAL DWH

11. HEAVY INTEGRATION OF UNSTRUCTURED DATA INTO RELATIONAL TABLES DATASETS ARE NEEDED DISTRIBUTED LOWER LATENCY REQUIRED BY AI USE-CASES, OTHER DATA WAREHOUSES, NEAR-REALTIME USE-CASES MULTIPLE TEAMS DO SAME LOW-LATENCY EVENT INTEGRATION STREAMING

12. 12 SALES ORDER EXAMPLE Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19 order.created order_id, order_date, items, ... shipment.created order_id, shipping_date, shipped_items, ... payment.done payment_id, payment_date, order_id, ... item.returned order_id, return_date, returned_item, ... sales-order order_id, order_date, payment_id, payment_date, items: shipped_at, returned_at, ... calculated_1, calculated_2 ...

13. 13 HOW WE STARTED? Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19 Topics Streaming S3 nakadi.io S3 Delta Table WAIT! Downstream

14. 14 INTEGRATION OF HISTORIC DATA Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19 Topics Streaming S3 nakadi.io S3 Delta TableCentral DWH Bootstrap Delta Table BOOM! Batch time increased to 2h !! MERGE command slow for needles in the haystack Downstream

15. 15 INTRODUCE SNAPSHOTS AND CHANGES TABLE Topics Streaming S3 nakadi.io S3Central DWH Bootstrap Delta Table Downstream Snapshot Changes Snapshotter Better, but still slow!

16. 16 LOAD SNAPSHOT INTO CLUSTER Topics Streaming S3 nakadi.io S3Central DWH Bootstrap Downstream Snapshot Changes Snapshotter Snapshot

17. 17 WHAT’S COMING NEXT? Topics Streaming S3 nakadi.io Central DWH Bootstrap Downstream Snapshotter S3 Snapshot Changes Snapshot Changes State Store ??? Snapshotter

18. 18 Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19 SQL vs SCALA # Started with 200 lines of SQL # Grew fast to 400 lines # Violated DRY principle # Hard to unit-test # Hard to refactor # Bad support for nested structures SCALA

19. 19 LESSONS LEARNED Data Warehousing with Spark Streaming - Spark + AI Summit Amsterdam ‘19 # Streaming needs different thinking # DWH ~ Backend Programming # Don’t start with SQL because it’s easy # Databricks Delta succeeds Parquet # Make sure all data is available in S3

20. THANKS A LOT! QUESTIONS? WE ARE HIRING!

Data Warehousing with Spark Streaming at Zalando

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