[jira] [Created] (FLINK-21165) Timestamps/Watermarks chained erroneously with previous operator

["zlzhang0122 (Jira)" <ji...@apache.org>]

zlzhang0122 created FLINK-21165:
-----------------------------------

             Summary: Timestamps/Watermarks chained erroneously with previous operator
                 Key: FLINK-21165
                 URL: https://issues.apache.org/jira/browse/FLINK-21165
             Project: Flink
          Issue Type: Bug
          Components: Client / Job Submission
    Affects Versions: 1.11.1, 1.12.0
            Reporter: zlzhang0122
         Attachments: Lark20210127-203541.png

When using assignTimestampAndWatermarks function separately, if it can satisfied the chaining condition, it will chained erroneously with previous operator.

For example, I have a code like bellow:

 
{code:java}
// code placeholder
DataStream<UserAction> ds = dataSource.map(xxx).setParallelism(1);

ds.assignTimestampAndWatermarks(xxxx);

DataStream<UserAction> rsStream = ds.keyBy(xxx).timeWindow(xxx).sum(xxx).setParallelism(2);{code}
I will get the JobGraph bellow.

!Lark20210127-203541.png!

If I change my code to this:
{code:java}
// code placeholder
DataStream<UserAction> ds = dataSource.map(xxx).setParallelism(1); 

DataStream<UserAction> watermarkStream = ds.assignTimestampAndWatermarks(xxxx); 

DataStream<UserAction> rsStream = watermarkStream.keyBy(xxx).timeWindow(xxx).sum(xxx).setParallelism(2);
{code}
I will get the same JobGraph, at the same time the actual execution result is not the same.

I think the first JobGraph have some problem and should not show like that, maybe the Timestamps/Watermarks operator should show separately and should not chaining with previous operator.



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