adesh-rao commented on a change in pull request #1275:
URL: https://github.com/apache/hive/pull/1275#discussion_r458940334



##########
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) {

Review comment:
       Agreed. I have removed the executor shutdown. 
   
   But where/should we add executor shutdown? I think since the Cleaner is 
supposed to be running all the time. We can skip executor shutdown?




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