zjuwangg commented on pull request #15283:
URL: https://github.com/apache/flink/pull/15283#issuecomment-802711896


   > what kind of failure have you observed, and why do you believe this to fix 
the issue?
   
   hi @zentol  The detailed error is 
https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=15017&view=logs&j=e25d5e7e-2a9c-5589-4940-0b638d75a414&t=a6e0f756-5bb9-5ea8-a468-5f60db442a29
   
   Fatal errror is as following:
   `Insufficient number of network buffers: required 33, but only 2 available. 
The total number of network buffers is currently set to 2048 of 32768 bytes 
each. You can increase this number by setting the configuration keys 
'taskmanager.memory.network.fraction', 'taskmanager.memory.network.min', and 
'taskmanager.memory.network.max'.
        at 
org.apache.flink.runtime.io.network.buffer.NetworkBufferPool.internalCreateBufferPool(NetworkBufferPool.java:372)
   `
   
   By change the parallelism, I think this should improve the test stablity. 


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