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https://issues.apache.org/jira/browse/FLINK-8423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16359369#comment-16359369
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ASF GitHub Bot commented on FLINK-8423:
---------------------------------------
Github user zhangminglei commented on a diff in the pull request:
https://github.com/apache/flink/pull/5447#discussion_r167395827
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/OperatorChain.java
---
@@ -591,16 +591,18 @@ public void collect(StreamRecord<T> record) {
operator.setKeyContextElement1(copy);
operator.processElement(copy);
} catch (ClassCastException e) {
- // Enrich error message
- ClassCastException replace = new
ClassCastException(
- String.format(
- "%s. Failed to push OutputTag
with id '%s' to operator. " +
- "This can occur when multiple
OutputTags with different types " +
- "but identical names are being
used.",
- e.getMessage(),
- outputTag.getId()));
-
- throw new
ExceptionInChainedOperatorException(replace);
+ if (outputTag != null) {
--- End diff --
Thanks @zentol A good method!
> OperatorChain#pushToOperator catch block may fail with NPE
> ----------------------------------------------------------
>
> Key: FLINK-8423
> URL: https://issues.apache.org/jira/browse/FLINK-8423
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Affects Versions: 1.4.0, 1.5.0
> Reporter: Chesnay Schepler
> Assignee: mingleizhang
> Priority: Critical
>
> {code}
> @Override
> protected <X> void pushToOperator(StreamRecord<X> record) {
> try {
> // we know that the given outputTag matches our OutputTag so
> the record
> // must be of the type that our operator (and Serializer)
> expects.
> @SuppressWarnings("unchecked")
> StreamRecord<T> castRecord = (StreamRecord<T>) record;
> numRecordsIn.inc();
> StreamRecord<T> copy =
> castRecord.copy(serializer.copy(castRecord.getValue()));
> operator.setKeyContextElement1(copy);
> operator.processElement(copy);
> } catch (ClassCastException e) {
> // Enrich error message
> ClassCastException replace = new ClassCastException(
> String.format(
> "%s. Failed to push OutputTag with id '%s' to
> operator. " +
> "This can occur when multiple OutputTags with
> different types " +
> "but identical names are being used.",
> e.getMessage(),
> outputTag.getId()));
> throw new ExceptionInChainedOperatorException(replace);
> } catch (Exception e) {
> throw new ExceptionInChainedOperatorException(e);
> }
> }
> {code}
> If outputTag is null (as is the case when no sideOutput was defined) the
> catch block will crash with a NullPointerException. This may happen if
> {{operator.processElement}} throws a ClassCastException.
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