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Integration Name+1 (explain if needed)-1 (with explanation)
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ZeroMQ

Denis Magda - low usage, better to have as an independent Github project that can be maintained by anybody.

Alexey Kuznetsov 

Alexey Goncharuk

Sergey Kozlov

Pavel Kovalenko

Alexey Zinoviev - all streaming tools/modules should be kept in one place (as part of AI or as Streaming AI separate project)

RocketMQ

Denis Magda - low usage, better to have as an independent Github project that can be maintained by anybody.

Alexey Kuznetsov

Alexey Goncharuk

Sergey Kozlov

Pavel Kovalenko

Alexey Zinoviev - all streaming tools/modules should be kept in one place (as part of AI or as Streaming AI separate project)

Storm

Denis Magda - low usage, better to have as an independent Github project that can be maintained by anybody.

Alexey Kuznetsov

Alexey Goncharuk

Sergey Kozlov

Pavel Kovalenko

Alexey Zinoviev - all streaming tools/modules should be kept in one place (as part of AI or as Streaming AI separate project)

Flume

Denis Magda - low usage, better to have as an independent Github project that can be maintained by anybody.

Alexey Kuznetsov

Alexey Goncharuk

Sergey Kozlov

Pavel Kovalenko

Alexey Zinoviev - all ETL tools/modules should be kept in one place (as part of AI or as ETL AI separate project) I mean that Flume is tool for loading big datasets to AI

Flink

Denis Magda - low usage, better to have as an independent Github project that can be maintained by anybody.

Alexey Kuznetsov

Alexey Goncharuk

Sergey Kozlov

Pavel Kovalenko

Alexey Zinoviev - all streaming tools/modules should be kept in one place (as part of AI or as Streaming AI separate project)

MQTT

Denis Magda - low usage, better to have as an independent Github project that can be maintained by anybody.

Alexey Kuznetsov

Alexey Goncharuk

Sergey Kozlov

Alexey Zinoviev

Pavel Kovalenko


Camel

Denis Magda - low usage, better to have as an independent Github project that can be maintained by anybody.

Alexey Kuznetsov

Alexey Goncharuk

Alexey Zinoviev

Pavel Kovalenko


Hibernate

Denis Magda - Spring Data gets much bigger adoption for Ignite deployments. Don't see a lot of traction with Hibernate. It's hard to maintain it in various variations - Ignite goes with several modules of different versions. Better to have as an independent Github project with forks for specific Hibernate versions.

Alexey Kuznetsov

Alexey Goncharuk

Sergey Kozlov

Pavel Kovalenko

Alexey Zinoviev - I suppose it's useful feature for wide adoption among Java Devs who use AI not like cache, but like database

JMS

Denis Magda - low usage, better to have as an independent Github project that can be maintained by anybody.

Alexey Kuznetsov

Alexey Goncharuk

Sergey Kozlov

Pavel Kovalenko

Alexey Zinoviev - all streaming tools/modules should be kept in one place (as part of AI or as Streaming AI separate project). Also, I didn't see the Kafka Integration in this list

AOP-Based Grid

Denis Magda - low usage, better to have as an independent Github project that can be maintained by anybody.

Alexey Kuznetsov

Alexey Goncharuk Maybe drop it at all because moving this into a separate project may be a pain - a lot of internal API usages

Sergey Kozlov

Alexey Zinoviev 

Pavel Kovalenko


JSR-107(JCache)

Denis Magda - don't see any value in supporting this JSR rather than claiming that specification. It's better to have much cleaner Ignite key-value API without any dependencies influenced by the specification.

Alexey Goncharuk

Sergey Kozlov

Pavel Kovalenko

Alexey Zinoviev we should ask about that question the user-community, I have heard many times that that the JCache implementation  is important for Java Devs

OSGi

Denis Magda - this integration is already broken and badly maintained. Haven't come across anybody who uses OSGi in the projects Ignite is targeted for.

Alexey Kuznetsov

Alexey Goncharuk

Sergey Kozlov

Alexey Zinoviev

Pavel Kovalenko


YARN

Denis Magda - not sure it's useful any longer and should be supported by the community.

Alexey Kuznetsov

Alexey Goncharuk

Sergey Kozlov

Alexey Zinoviev What was the purpose of this integration?

Pavel Kovalenko


Mesos

Denis Magda - not sure it's useful any longer and should be supported by the community.

Alexey Kuznetsov

Alexey Goncharuk

Sergey Kozlov

Alexey Zinoviev What was the purpose of this integration?

Pavel Kovalenko


.NET: Legacy Entity Framework and ASP.NET integrations

Denis Magda - outdated, needs to be replaced with a new one version.

Alexey Kuznetsov

Pavel Tupitsyn integrations with legacy technologies; also blocks .NET Core migration 

Sergey Kozlov

Alexey Zinoviev


Scalar

Alexey Goncharuk Not used, brings unnecessary dependency on scala, adds library conflicts

Sergey Kozlov

Alexey Zinoviev


Spark

Alexey Goncharuk Should be a separate project because it is a wrapper over the public API, but adds a scala dependency which slows down project compilation and complicates dependency management

Sergey Kozlov

Alexey Zinoviev I agree that it should be separate project, or we should integrate that with the Java API of Spark

Pavel Kovalenko Should be a separate project



The list of the integrations to be removed completely (don't even move them to an independent Github repo):

Integration+1 (explain if needed)-1 (with explanation)

Redis and Memcached protocols support

Denis Magda - not sure why these 2 were supported in the first place.

Sergey Kozlov - thin clients provide full and rich replacement

Alexey Zinoviev


 ignite-clients module

Denis Magda - we already have Thin Clients, duplicate features with fewer capabilities

Sergey Kozlov

Alexey Zinoviev


Hadoop Accelerator and IGFS

Denis Magda - community has already voted for the removal.

Sergey Kozlov

The community has already voted for the removal.

Alexey Zinoviev IGFS should be moved to the separate package in the first

AOP-Based Grid

Alexey Goncharuk Unused, hard to move to a separate module due to many internal API usages

Sergey Kozlov

Alexey Zinoviev


Ignite Schedule

Alexey Goncharuk same issues as with local caches

Sergey Kozlov - it can be implemeted in user code

Alexey Zinoviev

Pavel Kovalenko Ignite integration with distributed schedulers like Airflow or Oozie can be a better decision.


APIs for APIs for Removal

As part of the modularization, that needs to be considered for Ignite 3.0, it's worthwhile listing all the APIs that the community is planning to remove in Ignite 3.0. The APIs can belong to both Ignite core and modules that will stay in Ignite and will be officially supported by the community:

...

API+1 (explain if needed)-1 (with explanation)
Already deprecated APIs
Local caches

Denis Magda

Alexey Kuznetsov Can we "emulate" local cache by partitioned with "node filter to one node"?

Alexey Goncharuk Local cache is meaningless in a distributed system, especially when a transaction is involved: suppose a prepare step completed and a node with local cache goes down. According to 2PC, we cannot proceed until the node goes up again

Anton Vinogradov

Sergey Kozlov

Alexey Zinoviev

Pavel Kovalenko


Spatial indexes

Denis Magda - the API is broken and not suited for production. Can be designed from scratch with Ignite 3.1 and 3.2.

Alexey Goncharuk

Sergey Kozlov

Alexey Zinoviev It could be removed only in the 3.1 then the new implementation will be provided in other case we will poor with indices

Full-text search

Denis Magda - the API is broken and not suited for production. Can be designed from scratch with Ignite 3.1 and 3.2.

Alexey Goncharuk

Alexey Zinoviev It could be removed only in the 3.1 then the new implementation will be provided in other case we will poor with full-text indices

Checkpointing SPI

Denis Magda - Ignite caches/tables can be used to store the checkpoints. This API is redundant.

Alexey Goncharuk

Sergey Kozlov

Alexey Zinoviev 

Pavel Kovalenko


Ignite.lock

Alexey Goncharuk The distributed lock concept is broken (see corresponding Aphyr video). The usual lock usage pattern is lock - update cache - unlock. The same semantics can be achieved using pessimistic transactions with keys locking, but instead, for an end-user, it is clear how lock can fail in a distributed system (transaction rollback).

Anton Vinogradov

Sergey Kozlov

Pavel Kovalenko Very fragile API. Not tested well. Some failures can lead to unavailability of controlling such locks. Can be returned back and reworked after implementation of some consensus algorithm like Raft.

Denis Magda - unless an alternate solution is provided as part of existing Transactional APIs. There has to be a clear migration guide for Ignite.lock customers.

Alexey Zinoviev It could be removed only in the 3.1 then the new implementation will be provided 

Cache.lock

Alexey Goncharuk Same arguments as with Ignite.lock, but even more redundant API

Anton Vinogradov

Sergey Kozlov

Pavel Kovalenko

Alexey Zinoviev It could be removed only in the 3.1 then the new implementation will be provided 

Ignite Data Structures

Pavel Kovalenko Can be marked as not safe and reworked after implementation of some consensus algorithm like Raft.

Denis Magda - that's basic functionality of every IMDG and in-memory cache. We can't remove it. Instead, let's plan through activities that improve or reconsider current implementations.

Pavel Tupitsyn

Sergey Kozlov

Alexey Zinoviev Agree with Denis Magdaalso we should extend the list of basic structures (ready to help)

GAR files

"Force server mode" for client nodes


Daemon nodes

Denis Magda - Visorcmd has to be preserved and updated to another protocol

Alexey Kuznetsov - Visorcmd should be merged with controls.sh

Alexey Goncharuk

Anton Vinogradov

Sergey Kozlov

Alexey Zinoviev

Pavel Kovalenko


CacheRebalanceMode.NONE and Rebalance Delay

Denis Magda - it can break data consistency in a cluster. Also, remove force rebalance mode as it can be used only if rebalance delay is set.

Alexey Goncharuk The mode does not make sense, cannot be explained to an end-used

Anton Vinogradov

Sergey Kozlov

Alexey Zinoviev

Pavel Kovalenko


Indexing SPI

Denis Magda - it's highly unlikely that anybody used this. The community supports all the querying engines on its own.

Alexey Goncharuk

Sergey Kozlov

Alexey Zinoviev

Pavel Kovalenko


QueryEntities and Annotations based configuration of SQL

Denis Magda - Alexey Goncharuk is going to propose an alternate API that unites these concepts.

Sergey Kozlov - require full redesign, it should be fully compatible JDBC SQL and visa-versa

Alexey Zinoviev

Pavel Kovalenko


@CentralizedAffinityFunction

Alexey Goncharuk This API is no longer needed after exchange merge was introduced

Sergey Kozlov

Alexey Zinoviev

Pavel Kovalenko



Risks and Assumptions

  • Challenges with a modification of existing build and testing procedures
  • Release policies have to be updated to ensure that modules & core versions compatibility matrix is updated regularly. 

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