dingweiqings commented on code in PR #20755:
URL: https://github.com/apache/flink/pull/20755#discussion_r1019785880
##########
flink-formats/flink-hadoop-bulk/src/test/java/org/apache/flink/formats/hadoop/bulk/HadoopPathBasedPartFileWriterTest.java:
##########
@@ -82,13 +84,23 @@ public void testWriteFile() throws Exception {
DataStream<String> stream =
env.addSource(new FiniteTestSource<>(data),
TypeInformation.of(String.class));
Configuration configuration = new Configuration();
-
+ // Elements from source assign to one bucket , and produce two part
after checkpoint.
Review Comment:
In this test case use sync lock to make checkpoint twice , so fially we get
two part file . Doc reference
https://nightlies.apache.org/flink/flink-docs-master/docs/connectors/datastream/filesystem/#bucket-assignment
Code is in this method
```
org.apache.flink.streaming.util.FiniteTestSource#run
```
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