My recollection is as follows:
 - the window end time is computed first and that implies the start time. - The 
window end times for a event is determined based on alignment with the slide 
interval     I think this is the relevant code: 
https://github.com/apache/storm/blob/v1.2.2/storm-core/src/jvm/org/apache/storm/windowing/WatermarkTimeTriggerPolicy.java#L110-L116



    On Monday, December 3, 2018, 10:22:35 PM PST, ChenBo <[email protected]> 
wrote:  
 
 Hi All, I use storm-core  1.2.2, I am little confuse about storm.
In document, they say   "When a watermark is received, all windows up to that 
timestamp will be evaluated." 

the question, when are the window start timestamp?  

Any help is appreciated.Thanks,

ChenBo
  

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