Flink Snapshots: A Comprehensive Guide for New Users

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Snapshots are essential for ensuring data consistency and fault tolerance in Flink jobs. The abundance of features and nuances around snapshots might seem daunting to new users. In this talk, we explore the key aspects of snapshots, such as checkpoint vs savepoint usage, native vs canonical snapshot types, unaligned vs aligned strategies, and exactly once vs at least once semantics. We will delve into the benefits and trade-offs of each approach, equipping you with the knowledge to make informed decisions in your Flink deployments. We will also cover incremental snapshotting techniques that optimize the process by capturing only changes since the last snapshot. Lastly, we explore different state backends, discussing their implications on performance, scalability, and fault tolerance. Join this session to master Flink snapshots and enhance the reliability of your streaming applications!

Technology

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Flink Snapshots
A Comprehensive Guide for New Users

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Flink Snapshots
A Comprehensive Guide for New Users
Danny Cranmer
Principal Engineer at AWS
Apache Flink PMC Member

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Agenda
1. Stateful processing recap
2. Flink Checkpoints
3. State backends
4. Common problems
3

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 4
Simple Flink Example
SELECT SUM(clicks) FROM MyKafkaTopic
2
5
7
3
4
2 2
Input Output
7
14
17
21
23

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 5
Simple Flink Example
3
4
2 7
14 2
14
o6 o5 o4 o3 o2 o1
o4
In flight state

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Exactly once processing

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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At least once processing - Duplicates

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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At least once processing - Duplicates

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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At most once processing – Dropped Records

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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At most once processing – Dropped Records

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Flink Checkpoints

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Flink Checkpoints

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 14
Flink Checkpoints

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 15
Flink Checkpoints

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Barrier Alignment

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Barrier Alignment

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Barrier Alignment

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Checkpoint Lifecycle

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 20
Checkpoint Lifecycle

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 21
Checkpoint Lifecycle

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 22
Checkpoint Lifecycle

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Checkpointing Configuration
execution.checkpointing.interval
execution.checkpointing.min-pause
execution.checkpointing.timeout

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 24
Checkpoint Statistics
Demo

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 25
Checkpoint vs Savepoint

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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State Backends

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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State Backend Selection
28
state size < sum(Task Manager memory) / ?
? HashMap
: RocksDB

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Bottlenecks

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Buffer Debloating

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Buffer Debloating - Disabled

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Buffer Debloating - Disabled

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
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Buffer Debloating - Disabled

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 35
Buffer Debloating - Disabled

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 36
Buffer Debloating - Disabled

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 37
Buffer Debloating - Disabled

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 38
Buffer Debloating - Enabled

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 39
Buffer Debloating - Enabled

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 40
Buffer Debloating - Enabled

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 41
Buffer Debloating
taskmanager.network.memory.buffer-debloat.enabled: true
taskmanager.network.memory.buffer-debloat.target: 1s

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 42
Unaligned Checkpoints
- Checkpoint barriers jump the queue
- Records in buffers stored in the checkpoint
- Not supported for savepoints

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 43
Unaligned Checkpoints
env.getCheckpointConfig().enableUnalignedCheckpoints();
execution.checkpointing.unaligned: true

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 44
Incremental Checkpoints

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. 45
Incremental Checkpoints
env.setStateBackend(new RocksDBStateBackend(filebackend, true));
state.backend.incremental: true

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Load Test/Skew
46

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Load Test/Skew
47

FLINK SNAPSHOTS: A COMPREHENSIVE GUIDE FOR NEW USERS
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Thank you!
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Danny Cranmer
Principal Engineer at AWS
Apache Flink PMC Member

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