HyukjinKwon opened a new pull request #35945:
URL: https://github.com/apache/spark/pull/35945
### What changes were proposed in this pull request?
The test is flaky:
```
ReportSinkMetricsSuite:
- test ReportSinkMetrics *** FAILED *** (244 milliseconds)
Expected null, but got {"metrics-1"="value-1", "metrics-2"="value-2"}
(ReportSinkMetricsSuite.scala:75)
org.scalatest.exceptions.TestFailedException:
at
org.scalatest.Assertions.newAssertionFailedException(Assertions.scala:472)
at
org.scalatest.Assertions.newAssertionFailedException$(Assertions.scala:471)
at
org.scalatest.funsuite.AnyFunSuite.newAssertionFailedException(AnyFunSuite.scala:1563)
at org.scalatest.Assertions.assertResult(Assertions.scala:867)
at org.scalatest.Assertions.assertResult$(Assertions.scala:863)
at org.scalatest.funsuite.AnyFunSuite.assertResult(AnyFunSuite.scala:1563)
at
org.apache.spark.sql.streaming.ReportSinkMetricsSuite.$anonfun$new$2(ReportSinkMetricsSuite.scala:75)
at
org.apache.spark.sql.streaming.ReportSinkMetricsSuite.$anonfun$new$2$adapted(ReportSinkMetricsSuite.scala:60)
at
org.apache.spark.sql.test.SQLTestUtils.$anonfun$withTempDir$1(SQLTestUtils.scala:79)
at
org.apache.spark.sql.test.SQLTestUtils.$anonfun$withTempDir$1$adapted(SQLTestUtils.scala:78)
at org.apache.spark.SparkFunSuite.withTempDir(SparkFunSuite.scala:221)
at
org.apache.spark.sql.streaming.ReportSinkMetricsSuite.org$apache$spark$sql$test$SQLTestUtils$$super$withTempDir(ReportSinkMetricsSuite.scala:35)
at
org.apache.spark.sql.test.SQLTestUtils.withTempDir(SQLTestUtils.scala:78)
at
org.apache.spark.sql.test.SQLTestUtils.withTempDir$(SQLTestUtils.scala:77)
at
org.apache.spark.sql.streaming.ReportSinkMetricsSuite.withTempDir(ReportSinkMetricsSuite.scala:35)
at
org.apache.spark.sql.streaming.ReportSinkMetricsSuite.$anonfun$new$1(ReportSinkMetricsSuite.scala:60)
at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
```
We should wait all events to be processed.
See https://github.com/apache/spark/pull/35872#discussion_r832807001.
### Why are the changes needed?
To make the test not flaky.
### Does this PR introduce _any_ user-facing change?
No, test-only.
### How was this patch tested?
Existing tests. CI in this PR should test it out.
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