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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6315) Notify on checkpoint timeout
Date Wed, 19 Apr 2017 13:48:41 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15974694#comment-15974694

ASF GitHub Bot commented on FLINK-6315:

Github user sjwiesman commented on the issue:

    @aljoscha Could you review this or point me in the direction of the correct person? I
need this to land for the EventualConsistencySink

> Notify on checkpoint timeout 
> -----------------------------
>                 Key: FLINK-6315
>                 URL: https://issues.apache.org/jira/browse/FLINK-6315
>             Project: Flink
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Seth Wiesman
>            Assignee: Seth Wiesman
> A common use case when writing a custom operator that outputs data to some third party
location to partially output on checkpoint and then commit on notifyCheckpointComplete. If
that external system does not gracefully handle rollbacks (such as Amazon S3 not allowing
consistent delete operations) then that data needs to be handled by the next checkpoint. 
> The idea is to add a new interface similar to CheckpointListener that provides a callback
when the CheckpointCoordinator timesout a checkpoint
> {code:java}
> /**
>  * This interface must be implemented by functions/operations that want to receive
>  * a notification if a checkpoint has been {@link org.apache.flink.runtime.checkpoint.CheckpointCoordinator}
>  */
> public interface CheckpointTimeoutListener {
> 	/**
> 	 * This method is called as a notification if a distributed checkpoint has been timed
> 	 *
> 	 * @param checkpointId The ID of the checkpoint that has been timed out.
> 	 * @throws Exception
> 	 */
> 	void notifyCheckpointTimeout(long checkpointId) throws Exception;
> }
> {code}

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