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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