morningman opened a new pull request #2635: [Compaction] Limit the max 
concurrency of running compaction tasks
URL: https://github.com/apache/incubator-doris/pull/2635
 
 
   Compaction task may sometimes consume much memory and results in OOM.
   And currently, there is no good way to predict the mem consumption of
   a compaction task, so I add a new BE config: max_compaction_concurrency
   to limit the max concurrency of running compaction tasks manually.
   
   ISSUE #2633 

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