Tommy Becker created SAMZA-1012:
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Summary: Generated changelog mappings are not consistent
Key: SAMZA-1012
URL: https://issues.apache.org/jira/browse/SAMZA-1012
Project: Samza
Issue Type: Bug
Components: kv
Affects Versions: 0.10.1
Reporter: Tommy Becker
Assignee: Tommy Becker
Samza generates a changelog partition mapping for stateful jobs the first time
the job is started. The mapping is then persisted in the coordinator stream.
However, the way the mapping is generated does not guarantee the same mapping
will always be produced for the same inputs. Although this is not strictly
necessary (since the mapping is persisted) it can help in certain situations.
This bit us recently when we lost the contents of a checkpoint topic. The job
generated a new and different changelog mapping when restarted and began
producing very strange results which took a lot of effort to track down.
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