[jira] [Created] (FLINK-4628) User class loader unavailable during input split assignment

["Maximilian Michels (JIRA)" <ji...@apache.org>]

Maximilian Michels created FLINK-4628:
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             Summary: User class loader unavailable during input split assignment
                 Key: FLINK-4628
                 URL: https://issues.apache.org/jira/browse/FLINK-4628
             Project: Flink
          Issue Type: Bug
          Components: JobManager
    Affects Versions: 1.1.2, 1.2.0
            Reporter: Maximilian Michels
            Assignee: Maximilian Michels
            Priority: Minor


{{InputFormat}}\s runs through two configuration phases in the {{JobManager}}.

1. initializeOnMaster which runs the configure() method on the InputFormat
2. createInputSplits when the ExecutionJobVertex is created

In 1 we set the user class loader as the context class loader of the executing thread.

In 2 we only have the system class loader available. If any classes need to be loaded then, we have a problem. Some InputFormats rely on code which lazily load classes at different points in time.

In particular, this is a problem with the HBase TableInputFormat in the latest master.

We should make the user class loader available when creating input splits.



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