jaredstehler opened a new pull request #6689: [FLINK-8247] [Mesos] Support case where hadoop is not on classpath URL: https://github.com/apache/flink/pull/6689 ## What is the purpose of the change The hadoop-free distribution of Flink currently does not work on mesos, as the call to ```HadoopUserOverlay.newBuilder().fromEnvironment(configuration).build()``` fails with a class not found exception. This change guards against that error by checking for Hadoop on the classpath when loading UserGroupInformation; modeled after HadoopModuleFactory. ## Brief change log - *Updated HadoopUserOverlay to handle case where Hadoop is not on CP, without breaking API* ## Verifying this change This change can be verified as follows: - *Manually verified the change by starting a Flink Appmaster instance in mesos, without the hadoop uber jar in the lib dir* ## 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: yes - 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
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