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From Stefan Richter <s.rich...@data-artisans.com>
Subject Re: [VOTE] Release Apache Flink 1.2.0 (RC1)
Date Wed, 25 Jan 2017 09:52:57 GMT
Hi Robert,

I found an potientally blocking issue in RC1 that I would like to bring up for debate. In
[FLINK-5602], Ufuk found a NPE that happened during the first checkpoint after migrating a
job from Flink 1.1 to 1.2. I looked into this and found that the cause of this problem is
the absense of namespace serializers in Flink 1.1 checkpoints. Flink 1.2 always makes all
serializers part of the checkpoint and therefore a precondition to checkpointing fails if
a checkpoint runs before the user code is delivering the namespace serializer. This is a race
condition that (depending on the user code) could fail almost deterministcally in some situations
(e.g. user is registering the state rather late). The consequence is that checkpointing (and
the whole job) fails in this scenario and potentially prevents user from upgrading to 1.2.
I have a open PR #3200 that is fixing this problem.


> Am 24.01.2017 um 15:03 schrieb Robert Metzger <rmetzger@apache.org>:
> Dear Flink community,
> Please vote on releasing the following candidate as Apache Flink version
> 1.2.0.
> The commit to be voted on:
> 1bca1208 (*http://git-wip-us.apache.org/repos/asf/flink/commit/1bca1208
> <http://git-wip-us.apache.org/repos/asf/flink/commit/1bca1208>*)
> Branch:
> release-1.2.0-rc1
> (https://git1-us-west.apache.org/repos/asf/flink/repo?p=
> flink.git;a=shortlog;h=refs/heads/release-1.2.0-rc1)
> The release artifacts to be voted on can be found at:
> *http://people.apache.org/~rmetzger/flink-1.2.0-rc1/
> <http://people.apache.org/~rmetzger/flink-1.2.0-rc1/>*
> The release artifacts are signed with the key with fingerprint D9839159:
> http://www.apache.org/dist/flink/KEYS
> The staging repository for this release can be found at:
> https://repository.apache.org/content/repositories/orgapacheflink-1112
> -------------------------------------------------------------
> The vote ends in three days (3 pm CET | Friday, January 27, 2017)
> Please test the release rather now than on Friday morning, to be able to
> cancel it as early as possible.
> For making the testing easier, I've created this document to track what has
> already been tested and what needs to be tested:
> https://docs.google.com/document/d/1MX-8l9RrLly3UmZMODHBnuZUrK_n-DGIBLjFKyCrTAs/edit?usp=sharing
> Feel free to add more tests or change existing ones.
> [ ] +1 Release this package as Apache Flink 1.2.0
> [ ] -1 Do not release this package, because ...

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