srowen commented on issue #23833: [SPARK-26917][SQL] Cache lock recache by 
condition
URL: https://github.com/apache/spark/pull/23833#issuecomment-464924383
 
 
   I don't know this code well, but the change looks reasonable. The question 
of course is somehow whether the decision to uncache something could change 
between where it happens before and after. It doesn't seem so, as the intent 
here seems to be to evaluate what is to be uncached, release the lock, then do 
it. Maybe CC @cloud-fan  

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