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https://issues.apache.org/jira/browse/FLINK-2111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034120#comment-15034120
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ASF GitHub Bot commented on FLINK-2111:
---------------------------------------
Github user mjsax commented on a diff in the pull request:
https://github.com/apache/flink/pull/750#discussion_r46308707
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/ExecutionGraph.java
---
@@ -732,6 +758,18 @@ else if (current == JobStatus.RESTARTING) {
}
}
+ public void stop() {
+ if(jobType == JobType.STREAMING) {
+ for(ExecutionVertex ev :
this.getAllExecutionVertices()) {
+ if(ev.getNumberOfInputs() == 0) { // send
signal to sources only
+ ev.stop();
+ }
+ }
+ } else {
+ throw new RuntimeException("STOP is only supported by
streaming jobs.");
--- End diff --
This is not a problem: in `JobManager.scala` a potential `Throwable` is
caught when `ExecutionGraph.stop()` is called and a prober `StoppingFailure`
message is sent back as response. I tested this in local mode. The job manager
did not go down. Or is there any other place in the code in which this could
become a problem? As alternative, we could introduce a regular exception (ie,
`StoppingException`) and add a `throws` clause to `stop()`. What do you think
about this?
> Add "stop" signal to cleanly shutdown streaming jobs
> ----------------------------------------------------
>
> Key: FLINK-2111
> URL: https://issues.apache.org/jira/browse/FLINK-2111
> Project: Flink
> Issue Type: Improvement
> Components: Distributed Runtime, JobManager, Local Runtime,
> Streaming, TaskManager, Webfrontend
> Reporter: Matthias J. Sax
> Assignee: Matthias J. Sax
> Priority: Minor
>
> Currently, streaming jobs can only be stopped using "cancel" command, what is
> a "hard" stop with no clean shutdown.
> The new introduced "stop" signal, will only affect streaming source tasks
> such that the sources can stop emitting data and shutdown cleanly, resulting
> in a clean shutdown of the whole streaming job.
> This feature is a pre-requirment for
> https://issues.apache.org/jira/browse/FLINK-1929
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