You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/01/19 09:26:14 UTC

[GitHub] [flink] wangyang0918 opened a new pull request #10898: [FLINK-15632][kubernetes] Make zookeeper HA service could work for active kubernetes integration

wangyang0918 opened a new pull request #10898: [FLINK-15632][kubernetes] Make zookeeper HA service could work for active kubernetes integration
URL: https://github.com/apache/flink/pull/10898

<!--
*Thank you very much for contributing to Apache Flink - we are happy that you want to help us improve Flink. To help the community review your contribution in the best possible way, please go through the checklist below, which will get the contribution into a shape in which it can be best reviewed.*

*Please understand that we do not do this to make contributions to Flink a hassle. In order to uphold a high standard of quality for code contributions, while at the same time managing a large number of contributions, we need contributors to prepare the contributions well, and give reviewers enough contextual information for the review. Please also understand that contributions that do not follow this guide will take longer to review and thus typically be picked up with lower priority by the community.*

## Contribution Checklist

- Make sure that the pull request corresponds to a [JIRA issue](https://issues.apache.org/jira/projects/FLINK/issues). Exceptions are made for typos in JavaDoc or documentation files, which need no JIRA issue.

- Name the pull request in the form "[FLINK-XXXX] [component] Title of the pull request", where *FLINK-XXXX* should be replaced by the actual issue number. Skip *component* if you are unsure about which is the best component.
Typo fixes that have no associated JIRA issue should be named following this pattern: `[hotfix] [docs] Fix typo in event time introduction` or `[hotfix] [javadocs] Expand JavaDoc for PuncuatedWatermarkGenerator`.

- Fill out the template below to describe the changes contributed by the pull request. That will give reviewers the context they need to do the review.

- Make sure that the change passes the automated tests, i.e., `mvn clean verify` passes. You can set up Travis CI to do that following [this guide](https://flink.apache.org/contributing/contribute-code.html#open-a-pull-request).

- Each pull request should address only one issue, not mix up code from multiple issues.

- Each commit in the pull request has a meaningful commit message (including the JIRA id)

- Once all items of the checklist are addressed, remove the above text and this checklist, leaving only the filled out template below.

**(The sections below can be removed for hotfixes of typos)**
-->

## What is the purpose of the change

There will be the following differences if we want to support HA for active Kubernetes integration.
1. The K8s service is designed for accessing the jobmanager out of K8s cluster. So Flink client will not use HA service to retrieve address of jobmanager. Instead, it always use Kubernetes service to contact with jobmanager via rest client.
2. The Kubernetes DNS creates A and SRV records only for Services. It doesn't generate pods' A records. So the ip address, not hostname, will be used as jobmanager address.

All other behaviors will be same as Zookeeper HA for standalone and Yarn.

## Brief change log

* Always use Kubernetes service for client to contact with jobmanager in `KubernetesClusterDescriptor`
* Set ip address to `jobmanager.rpc.address` in `KubernetesSessionClusterEntrypoint`

## Verifying this change

* Add a new unit test `testDeployHighAvailabilitySessionCluster`
* Test on a real Kubernetes cluster with zookeeper HA

## Does this pull request potentially affect one of the following parts:

- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
- The S3 file system connector: (no)

## Documentation

- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (not applicable)

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org

With regards,
Apache Git Services