fa zheng created FLINK-15211:
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             Summary: Web UI request url for watermark is too long in large 
parallelism
                 Key: FLINK-15211
                 URL: https://issues.apache.org/jira/browse/FLINK-15211
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Web Frontend
    Affects Versions: 1.9.1, 1.9.0
            Reporter: fa zheng
             Fix For: 1.10.0


In large parallelism. The request url to get watermark metric seems to too long 
 to get response.  The request url  is:

[http://0.0.0.0:8081/jobs/:jobid/vertices/:vertexid/metrics?get=0.currentInputWatermark,......,1199.currentInputWatermark]

The reason is 
org.apache.flink.shaded.netty4.io.netty.handler.codec.TooLongFrameException: An 
HTTP line is larger than 4096 bytes.

 

It need to paginate request and merge the result.



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