THUMarkLau opened a new pull request #4015:
URL: https://github.com/apache/iotdb/pull/4015


   Currently, there are two submission entries for compaction tasks in IoTDB: 
one is triggered periodically, and the other is to manually execute the `merge` 
statement in the CLI. Under normal circumstances, these two portals will not 
submit merge tasks at the same time. But in some cases, these two entries are 
triggered together, it is possible to submit the same merge task, causing 
concurrency problems.
   
![1ef0deaf8a07b11cec0a360c1b68980](https://user-images.githubusercontent.com/37140360/134443508-04f641fa-cd45-42dd-8d82-57c17096c3be.png)
   


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