deniskuzZ commented on a change in pull request #1275:
URL: https://github.com/apache/hive/pull/1275#discussion_r458704339



##########
File path: ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/Cleaner.java
##########
@@ -89,23 +93,28 @@ public void run() {
         handle = 
txnHandler.getMutexAPI().acquireLock(TxnStore.MUTEX_KEY.Cleaner.name());
         startedAt = System.currentTimeMillis();
         long minOpenTxnId = txnHandler.findMinOpenTxnIdForCleaner();
+        List<CompletableFuture> cleanerList = new ArrayList<>();
         for(CompactionInfo compactionInfo : txnHandler.findReadyToClean()) {
-          clean(compactionInfo, minOpenTxnId);
+          
cleanerList.add(CompletableFuture.runAsync(CompactorUtil.ThrowingRunnable.unchecked(()
 ->
+                  clean(compactionInfo, minOpenTxnId)), cleanerExecutor));
         }
+        CompletableFuture.allOf(cleanerList.toArray(new 
CompletableFuture[0])).join();
       } catch (Throwable t) {
         LOG.error("Caught an exception in the main loop of compactor cleaner, 
" +
-            StringUtils.stringifyException(t));
-      }
-      finally {
+                StringUtils.stringifyException(t));
+        if (cleanerExecutor != null) {
+          cleanerExecutor.shutdownNow();
+          cleanerExecutor = CompactorUtil.createExecutorWithThreadFactory(
+                  
conf.getIntVar(HiveConf.ConfVars.HIVE_COMPACTOR_CLEANER_REQUEST_QUEUE), 
threadNameFormat);
+        }
+      } finally {
         if (handle != null) {
           handle.releaseLocks();
         }
       }
       // Now, go back to bed until it's time to do this again
       long elapsedTime = System.currentTimeMillis() - startedAt;
-      if (elapsedTime >= cleanerCheckInterval || stop.get())  {
-        continue;
-      } else {
+      if (!(elapsedTime >= cleanerCheckInterval || stop.get())) {

Review comment:
       could you move negation inside: elapsedTime < cleanerCheckInterval && 
!stop.get()




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