[jira] [Commented] (APEXMALHAR-2017) Use pre checkpoint notification to optimize operator IO

["Chandni Singh (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/APEXMALHAR-2017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15198726#comment-15198726 ] 

Chandni Singh commented on APEXMALHAR-2017:
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Please publish benchmark numbers for this optimization

> Use pre checkpoint notification to optimize operator IO
> -------------------------------------------------------
>
>                 Key: APEXMALHAR-2017
>                 URL: https://issues.apache.org/jira/browse/APEXMALHAR-2017
>             Project: Apache Apex Malhar
>          Issue Type: Improvement
>            Reporter: Pramod Immaneni
>            Assignee: Pramod Immaneni
>
> Currently many output operators enforce persistence of data on endWindow by calling flush, hflush or equivalent calls. This was done to help recovery. Doing this always ensures that the data corresponding to checkpoint state at recovery is always present.
> A recent addition to the engine lets the operators know about an impending checkpoint just before it happens using a callback. Operators can now enforce persistence of data one time in this in this callback instead of end of every window. This results in better performance as data is not being frequently written to persistent storage.



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