GiantKing opened a new issue #845:
URL: https://github.com/apache/incubator-pegasus/issues/845


   ## Feature Request
   There are some time-consuming operations in Pegasus:
   recall, balance, backup, bulk load, restore, manual compact, partition split
   
   It will have an impact on online service while it proceeding. Especially 
they are running in concurrent. So we have to serialize these operations.
   
   We can add an operation status lock for meta. Before a operation begins, 
acquire this lock first. And release this lock as it finish.


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