Tian Jiang created IOTDB-880:
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             Summary: [Distributed] Better concurrecy control in RaftLogManager
                 Key: IOTDB-880
                 URL: https://issues.apache.org/jira/browse/IOTDB-880
             Project: Apache IoTDB
          Issue Type: Improvement
          Components: Core/Cluster
            Reporter: Tian Jiang


Concurrency control is very primitive in the current version RaftLogManager, 
especially when there are log capacity checks and log removals, and concurrent 
requests like "getTerm()" may fail and we must retry. 

This is not very elegant and it is better to utilize locks to guarantee 
concurrent safety.



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