Hi Xingcan Thanks for the answer. But up to my understanding
countWindow(4,2) - Should wait for 4 elements (or window not more than 4 element) and once the window is ready, slide two items Now if I have to stopped asking why questions and worry about my current problem, how do I achieve this expected output. Stream : 1,2,3,4,5,6,7,8... Output: 1,2 2,3 3,4 4,5... -- View this message in context: http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/Sliding-Window-Weird-behaviour-tp17013p17019.html Sent from the Apache Flink Mailing List archive. mailing list archive at Nabble.com.