[
https://issues.apache.org/jira/browse/BEAM-11267?focusedWorklogId=513977&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-513977
]
ASF GitHub Bot logged work on BEAM-11267:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Nov/20 07:18
Start Date: 19/Nov/20 07:18
Worklog Time Spent: 10m
Work Description: dmvk commented on a change in pull request #13353:
URL: https://github.com/apache/beam/pull/13353#discussion_r526641055
##########
File path:
runners/flink/src/test/java/org/apache/beam/runners/flink/FlinkStreamingPipelineTranslatorTest.java
##########
@@ -120,4 +138,95 @@ public void testAutoBalanceShardKeyCacheMaxSize() throws
Exception {
assertThat(
fn.getCache().size(),
equalTo(FlinkAutoBalancedShardKeyShardingFunction.CACHE_MAX_SIZE));
}
+
+ @Test
+ public void testStatefulParDoAfterCombineChaining() {
+ final JobGraph stablePartitioning =
getStatefulParDoAfterCombineChainingJobGraph(true);
+ final JobGraph unstablePartitioning =
getStatefulParDoAfterCombineChainingJobGraph(false);
+ // We expect an extra shuffle stage for unstable partitioning.
+ Assert.assertEquals(
+ 1,
+ Iterables.size(unstablePartitioning.getVertices())
+ - Iterables.size(stablePartitioning.getVertices()));
+ }
+
+ private JobGraph getStatefulParDoAfterCombineChainingJobGraph(boolean
stablePartitioning) {
+ final StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+ final FlinkStreamingPipelineTranslator translator =
+ new FlinkStreamingPipelineTranslator(env,
PipelineOptionsFactory.create());
+ final PipelineOptions pipelineOptions = PipelineOptionsFactory.create();
+ pipelineOptions.setRunner(FlinkRunner.class);
+ final Pipeline pipeline = Pipeline.create(pipelineOptions);
+ PCollection<KV<String, Long>> aggregate =
+ pipeline
+ .apply(Create.of("foo", "bar").withCoder(StringUtf8Coder.of()))
+ .apply(Count.perElement());
+ if (!stablePartitioning) {
+ // When we insert any element-wise "map" operation between aggregation
and stateful ParDo, we
+ // can no longer assume that partitioning did not change, therefore we
need an extra shuffle
+ aggregate = aggregate.apply(ParDo.of(new StatelessIdentityDoFn<>()));
+ }
+ aggregate.apply(ParDo.of(new StatefulNoopDoFn<>()));
+ translator.translate(pipeline);
+ return env.getStreamGraph().getJobGraph();
+ }
+
+ @Test
+ public void testStatefulParDoAfterGroupByKeyChaining() {
+ final JobGraph stablePartitioning =
getStatefulParDoAfterGroupByKeyChainingJobGraph(true);
+ final JobGraph unstablePartitioning =
getStatefulParDoAfterGroupByKeyChainingJobGraph(false);
+ // We expect an extra shuffle stage for unstable partitioning.
+ Assert.assertEquals(
+ 1,
+ Iterables.size(unstablePartitioning.getVertices())
+ - Iterables.size(stablePartitioning.getVertices()));
+ }
+
+ private JobGraph getStatefulParDoAfterGroupByKeyChainingJobGraph(boolean
stablePartitioning) {
+ final StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+ final FlinkStreamingPipelineTranslator translator =
+ new FlinkStreamingPipelineTranslator(env,
PipelineOptionsFactory.create());
+ final PipelineOptions pipelineOptions = PipelineOptionsFactory.create();
+ pipelineOptions.setRunner(FlinkRunner.class);
+ final Pipeline pipeline = Pipeline.create(pipelineOptions);
+ PCollection<KV<String, Iterable<Long>>> aggregate =
+ pipeline
+ .apply(
+ Create.of(KV.of("foo", 1L), KV.of("bar", 1L))
+ .withCoder(KvCoder.of(StringUtf8Coder.of(),
VarLongCoder.of())))
+ .apply(GroupByKey.create());
Review comment:
I thought about it, but the methods are really small so it's worth
decreasing readability here
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Issue Time Tracking
-------------------
Worklog Id: (was: 513977)
Time Spent: 2h 40m (was: 2.5h)
> Remove unnecessary reshuffle for stateful ParDo after keyed operation
> ---------------------------------------------------------------------
>
> Key: BEAM-11267
> URL: https://issues.apache.org/jira/browse/BEAM-11267
> Project: Beam
> Issue Type: Improvement
> Components: runner-flink
> Reporter: David Morávek
> Assignee: David Morávek
> Priority: P3
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> When we have stateful pardo after GBK / Combine, we can safely assume that
> partitioning remains consistent and we can safe an extra shuffle.
> The use case for this are user defined timers / datadriven triggers. This
> code path is stressed for example by
> org.apache.beam.sdk.transforms.ParDoTest.TimerTests#testGbkFollowedByUserTimers.
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