keith-turner commented on a change in pull request #2372:
URL: https://github.com/apache/accumulo/pull/2372#discussion_r763269860



##########
File path: 
server/compactor/src/main/java/org/apache/accumulo/compactor/Compactor.java
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@@ -184,7 +184,7 @@ protected void 
startCancelChecker(ScheduledThreadPoolExecutor schedExecutor,
         TimeUnit.MILLISECONDS);
   }
 
-  protected void checkIfCanceled() {
+  protected synchronized void checkIfCanceled() {

Review comment:
       > Could add another check to this method to see if the compactionThread 
is already interrupted so we don't keep calling interrupt while waiting for the 
thread to die.
   
   It may be useful to keep interrupting a thread because some code may ignore 
interrupts w/o throwing an exception. 




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