morningman opened a new issue #969: Avoid compacting tablet if it referenced by 
some query
URL: https://github.com/apache/incubator-doris/issues/969
 
 
   **Describe**
   When doing some long time queries, with high frequency load, some tablets 
may already been compacted before the query arrival. So that the version can 
not be found, which cause the query failed.
   
   I think we can **mark** the tablets and its version before doing the real 
scan. The marked version cannot be compacted for a certain time

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