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Under the Hood of Reactive Data Access

Mark Paluch
December 05, 2017

Under the Hood of Reactive Data Access

Slides of the talk I gave at SpringOne Platform 2017.

Links:
* Slides – https://mp911.de/s1p-hood-slides
* Example Code – https://mp911.de/s1p-hood-code
* Spring Data Examples – https://github.com/spring-projects/spring-data-examples
* Find us on Gitter: https://gitter.im/spring-projects/spring-data

Mark Paluch

December 05, 2017
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  1. Under the Hood of
    Reactive Data Access
    Mark Paluch
    @mp911de
    1

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  2. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Spring Data Modules
    2
    JPA

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  3. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Reactive Spring Data Modules
    3
    JPA

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  4. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    JDBC
    Fully-blocking API
    Non-blocking API announced (JDK-8188051)
    4
    http://mail.openjdk.java.net/pipermail/jdbc-spec-discuss/ • JDK-8188051: http://hg.openjdk.java.net/jdk10/sandbox/jdk/rev/a31057bda7c5

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  5. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Relational Databases
    Limited scalability
    Resource synchronization
    Transactions
    5

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  6. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Query by time
    6
    Transport

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  7. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Synchronous Data Access
    7
    Data store
    App
    Data store
    App
    Data store

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  8. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Reactive Data Access
    8
    Data store
    App
    Data store Data store Data store
    App

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  9. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Differences to imperative Data Access
    Drivers require threading infrastructure
    Timeout handling different
    9

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  10. Reactive NoSql drivers

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  11. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Reactive drivers
    End-to-end nonblocking
    Asynchronous request-response processing
    Non-blocking pooling
    Non-blocking connect
    11

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  12. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Application Driver Application
    12
    Request Server selection
    Queueing
    Write Response decoding
    Response buffering
    Request completion Response

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  13. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    MongoDB
    Reactive-over-async driver
    Cursor lifecycle
    Pluggable I/O
    Pooled connections
    13

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  14. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Query by time
    14
    Request
    Response
    (chunk)
    Response
    (complete)
    Prefetch
    (cont.d)
    Query
    Emit
    elements
    Result
    processing

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  15. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    MongoDB Driver Fetching
    15
    Operator
    MongoDB Subscriber
    request(Long.MAX_VALUE)
    request(Long.MAX_VALUE)

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  16. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    MongoDB Driver Fetching
    16
    Filter
    MongoDB Subscriber
    request(Long.MAX_VALUE)
    request(Long.MAX_VALUE)

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  17. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    MongoDB Driver Fetching
    17
    Operator
    (filter)
    MongoDB Subscriber
    request(1)
    Dropped element
    request(Long.MAX_VALUE)

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  18. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Specific Features
    Tailable Cursors (@Tailable)
    MongoDB 3.6: Change Streams
    18
    Cursor size derived from demand

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  19. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Redis
    Reactive driver (Lettuce 5)
    Based on Netty and Project Reactor
    Singleton connection
    Pooled connections
    19

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  20. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Command by time
    20
    Request
    Command
    Command
    (subscription)
    Response
    (chunk)
    Response
    (complete)

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  21. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Specifics
    Use ByteBuffer instead byte[]
    @null handling: Emission of empty buffers
    Suspend reading if no demand
    21

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  22. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Apache Cassandra
    Reactive bridge over async driver
    Netty-based driver (Datastax)
    Pooled connections
    22

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  23. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Query by time
    23
    Request
    Response
    (chunk)
    Response
    (complete)
    Query
    Emit
    elements
    Result processing
    Next page

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  24. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Outlook
    Cassandra driver 4.0 in the works
    Likely support for reactive execution model
    Emit items as they are received
    24
    https://github.com/datastax/java-driver/tree/4.x • https://datastax-oss.atlassian.net/browse/JAVA-1505

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  25. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Couchbase
    Reactive driver driver
    Based on Netty and RxJava 1
    Multiple connection schemes
    25

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  26. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Couchbase Fetching
    Key-Value, DCP
    1. Request
    2. Response
    3. Emit results

    Search, Query, View
    1. Request
    2. Response streaming
    26

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  27. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Command by time
    27
    Request
    Command
    Command
    (subscription)
    Response
    (chunk)
    Response
    (complete)

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  28. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Outlook
    Couchbase driver likely to move to RxJava 2
    • No tickets/decisions yet
    28

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  29. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
    Resources
    Slides – mp911.de/s1p-hood-slides
    Example Code – mp911.de/s1p-hood-code
    Spring Data Examples – Repository @ Github
    Find us on Gitter!
    29

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  30. Feedback welcome

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  31. Learn More. Stay Connected.
    31
    #springone
    @s1p

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  32. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
    Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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    33

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