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From "Pramod Immaneni (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APEXCORE-339) Support ability to tag operators as idempotent or non-idempotent
Date Tue, 01 Mar 2016 22:16:18 GMT

    [ https://issues.apache.org/jira/browse/APEXCORE-339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15174520#comment-15174520

Pramod Immaneni commented on APEXCORE-339:

Checkpoint groups is being used to group the idempotent set of operators.

> 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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