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https://issues.apache.org/jira/browse/BEAM-2898?focusedWorklogId=80944&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-80944
]
ASF GitHub Bot logged work on BEAM-2898:
----------------------------------------
Author: ASF GitHub Bot
Created on: 15/Mar/18 19:01
Start Date: 15/Mar/18 19:01
Worklog Time Spent: 10m
Work Description: tgroh commented on a change in pull request #4783:
[BEAM-2898] Support Impulse transforms in Flink batch runner
URL: https://github.com/apache/beam/pull/4783#discussion_r174893743
##########
File path:
runners/core-construction-java/src/main/java/org/apache/beam/runners/core/construction/graph/GreedyPipelineFuser.java
##########
@@ -69,6 +69,15 @@ private GreedyPipelineFuser(Pipeline p) {
fusePipeline(groupSiblings(rootConsumers));
}
+ /**
+ * Fuses a {@link Pipeline} into a collection of {@link ExecutableStage}s.
+ *
+ * <p>This fuser expects each ExecutableStage to have exactly one input.
This means that pipelines
+ * must be rooted at Impulse, or other runner-executed primitive transforms,
instead of primitive
+ * Read nodes. The utilities in
+ * {@link org.apache.beam.runners.core.construction.JavaReadViaImpulse} can
be used to translate
+ * non-compliant pipelines.
Review comment:
This does kind of have an associated `TODO` for unbounded reads;
https://issues.apache.org/jira/browse/BEAM-3859 is the (just-authored) issue to
link against.
'can be used to translate non-compliant pipelines -> can be used to convert
bounded pipelines using the `Read` primitive.'
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Issue Time Tracking
-------------------
Worklog Id: (was: 80944)
> Flink supports chaining/fusion of single-SDK stages
> ---------------------------------------------------
>
> Key: BEAM-2898
> URL: https://issues.apache.org/jira/browse/BEAM-2898
> Project: Beam
> Issue Type: Sub-task
> Components: runner-flink
> Reporter: Henning Rohde
> Priority: Major
> Labels: portability
> Time Spent: 2h 50m
> Remaining Estimate: 0h
>
> The Fn API supports fused stages, which avoids unnecessarily round-tripping
> the data over the Fn API between stages. The Flink runner should use that
> capability for better performance.
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