title: Data Factory - Data Lake File Created Event Trigger fires twice
body: <p>I'm developing Pipeline in Azure Data Factory V2. It has very simple Copy activity. The Pipeline has to start when a file is added to Azure Data Lake Store Gen 2. In order to do that I have created a Event Trigger attached to ADLS_gen2 on Blob created. Then assigned trigger to pipeline and associate trigger data @triggerBody().fileName to pipeline parameter. </p>
  
  <p>To test this I'm using Azure Storage Explorer and upload file to data lake. The problem is that the trigger in Data Factory is fired twice, resulting pipeline to be started twice. First pipeline run finish as expected and second one stays in processing.</p>
  
  <p>Has anyone faced this issue? I have tried to delete the trigger in DF and create new one but the result was the same with new trigger.
  <a href="https://i.stack.imgur.com/FXPsS.png" rel="noreferrer">enter image description here</a></p>
  
  <p><a href="https://i.stack.imgur.com/nhA66.png" rel="noreferrer">enter image description here</a></p>