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apache / incubator-livy / 25542e4e78b39a3c9b9426a70a92ca7c183daea3
commit25542e4e78b39a3c9b9426a70a92ca7c183daea3[log] [tgz]
authorrunzhiwang <runzhiwang@tencent.com>Thu Dec 19 14:29:01 2019 +0800
committerjerryshao <jerryshao@tencent.com>Thu Dec 19 14:29:01 2019 +0800
treeb0f24055cdf6bf2deb27c380be5de0f07b701014
parent1c656aad3495814fb55b5c2f5be708642b6174f3 [diff]
[LIVY-727] Fix session state always be idle though the yarn application has been killed after restart livy

## What changes were proposed in this pull request?

[LIVY-727] Fix session state always be idle though the yarn application has been killed after restart livy.

Follows are steps to reproduce the problem:
1. Set livy.server.recovery.mode=recovery, and create a session in yarn-cluster
2. Restart livy
3. Kill the yarn application of the session.
4. The session state will always be idle and never change to killed or dead. Just as the image, livy-session-16 has been killed in yarn, but the state is still idle.
![image](https://user-images.githubusercontent.com/51938049/70371088-92695c80-1909-11ea-875c-73696db693ce.png)

The cause of the problem are as follows:
1. Because when recover session, livy will not startDriver again, so the driverProcess is None.
2. SparkYarnApp will not be created in `driverProcess.map { _ => SparkApp.create(appTag, appId, driverProcess, livyConf, Some(this)) }` when driverProcess is None.
3. So yarnAppMonitorThread of the session will never start, and the session state will never change.

How to fix the bug:
1. If livy run in yarn, SparkApp will create even though the driverProcess is None
2. If not run in yarn, SparkApp will not create, because the code require driverProcess is not None at https://github.com/apache/incubator-livy/blob/master/server/src/main/scala/org/apache/livy/utils/SparkApp.scala#L93,
  and I don't want to change the behavior.

## How was this patch tested?

1. Set livy.server.recovery.mode=recovery, and create a session in yarn-cluster
2. Restart livy
3. Kill the yarn application of the session.
4. The session state will change to killed

Author: runzhiwang <runzhiwang@tencent.com>

Closes #265 from runzhiwang/session-state.
1 file changed
tree: b0f24055cdf6bf2deb27c380be5de0f07b701014
  1. .github/
  2. api/
  3. assembly/
  4. bin/
  5. client-common/
  6. client-http/
  7. conf/
  8. core/
  9. coverage/
  10. dev/
  11. docs/
  12. examples/
  13. integration-test/
  14. python-api/
  15. repl/
  16. rsc/
  17. scala/
  18. scala-api/
  19. server/
  20. test-lib/
  21. thriftserver/
  22. .gitignore
  23. .rat-excludes
  24. .travis.yml
  25. checkstyle-suppressions.xml
  26. checkstyle.xml
  27. DISCLAIMER
  28. LICENSE
  29. NOTICE
  30. pom.xml
  31. README.md
  32. scalastyle.xml
README.md

Apache Livy

Build Status

Apache Livy is an open source REST interface for interacting with Apache Spark from anywhere. It supports executing snippets of code or programs in a Spark context that runs locally or in Apache Hadoop YARN.

  • Interactive Scala, Python and R shells
  • Batch submissions in Scala, Java, Python
  • Multiple users can share the same server (impersonation support)
  • Can be used for submitting jobs from anywhere with REST
  • Does not require any code change to your programs

Pull requests are welcomed! But before you begin, please check out the Contributing section on the Community page of our website.

Online Documentation

Guides and documentation on getting started using Livy, example code snippets, and Livy API documentation can be found at livy.incubator.apache.org.

Before Building Livy

To build Livy, you will need:

Debian/Ubuntu:

  • mvn (from maven package or maven3 tarball)
  • openjdk-8-jdk (or Oracle JDK 8)
  • Python 2.7+
  • R 3.x

Redhat/CentOS:

  • mvn (from maven package or maven3 tarball)
  • java-1.8.0-openjdk (or Oracle JDK 8)
  • Python 2.7+
  • R 3.x

MacOS:

  • Xcode command line tools
  • Oracle's JDK 1.8
  • Maven (Homebrew)
  • Python 2.7+
  • R 3.x

Required python packages for building Livy:

  • cloudpickle
  • requests
  • requests-kerberos
  • flake8
  • flaky
  • pytest

To run Livy, you will also need a Spark installation. You can get Spark releases at https://spark.apache.org/downloads.html.

Livy requires Spark 2.2+. You can switch to a different version of Spark by setting the SPARK_HOME environment variable in the Livy server process, without needing to rebuild Livy.

Building Livy

Livy is built using Apache Maven. To check out and build Livy, run:

git clone https://github.com/apache/incubator-livy.git
cd incubator-livy
mvn package

By default Livy is built against Apache Spark 2.2.0, but the version of Spark used when running Livy does not need to match the version used to build Livy. Livy internally handles the differences between different Spark versions.

The Livy package itself does not contain a Spark distribution. It will work with any supported version of Spark without needing to rebuild.