Kejian-Li removed a comment on pull request #3947:
URL: https://github.com/apache/carbondata/pull/3947#issuecomment-698910832


   > Consider a scenario that the user want to insert data and then update the 
table, the dml commands are sent one by one in time series, but the 2nd(update) 
cmd is sent by another driver and start to execute while the 1st(insert) is 
still running, therefore the concurrency scenario described in this PR appears.
   > If we allow update table who has segment with status 'INSERT_INPROGRESS', 
the 2nd cmd(update) will execute successfully and the data inserted by the 1st 
cmd would not updated by the 2nd cmd.
   > In this case, the result may not be what the user expected.
   
   


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