Abhishek Agarwal created PIG-4680:
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Summary: Enable pig job graphs to resume from last successful state
Key: PIG-4680
URL: https://issues.apache.org/jira/browse/PIG-4680
Project: Pig
Issue Type: Improvement
Components: impl
Reporter: Abhishek Agarwal
Pig scripts can have multiple ETL jobs in the DAG which may take hours to
finish. In case of transient errors, the job fails. When the job is rerun, all
the nodes in Job graph will rerun. Some of these nodes may have already run
successfully. Redundant runs lead to wastage of cluster capacity and pipeline
delays.
In case of failure, we can persist the graph state. In next run, only the
failed nodes and their successors will rerun. This is of course subject to
preconditions such as
- Pig script has not changed
- Input locations have not changed
- Output data from previous run is intact
- Configuration has not changed
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