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Posted to dev@apex.apache.org by "Pramod Immaneni (JIRA)" <ji...@apache.org> on 2016/02/12 00:59:18 UTC

[jira] [Created] (APEXCORE-339) Support ability to tag operators as idempotent or non-idempotent

Pramod Immaneni created APEXCORE-339:
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             Summary: Support ability to tag operators as idempotent or non-idempotent
                 Key: APEXCORE-339
                 URL: https://issues.apache.org/jira/browse/APEXCORE-339
             Project: Apache Apex Core
          Issue Type: Bug
            Reporter: Pramod Immaneni
            Assignee: Pramod Immaneni


Certain application require idempotency and some others don't. Additionally operators such as input operators need to be specially instrumented to exhibit idempotent behavior. Certain output operators like database operators rely on idempotency. For these reasons we need ability to label operators as idempotent or now, whether output operators require idempotency from upstream operators or not. In case of a failure the platform should handle non-idempotent streams by restarting the failed operator and all downsteram operators at the same checkpoint.



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