tarak271 commented on code in PR #4970:
URL: https://github.com/apache/hive/pull/4970#discussion_r1481076713


##########
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/service/CompactionHouseKeeperService.java:
##########
@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hive.metastore.txn.service;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hive.metastore.conf.MetastoreConf;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Performs background tasks for Transaction management in Hive.
+ * Runs inside Hive Metastore Service.
+ */
+public class CompactionHouseKeeperService extends AcidHouseKeeperService {
+
+  public CompactionHouseKeeperService() {
+    serviceName = this.getClass().getSimpleName();
+  }
+
+  @Override
+  public long runFrequency(TimeUnit unit) {
+    return MetastoreConf.getTimeVar(getConf(), 
MetastoreConf.ConfVars.COMPACTION_HOUSEKEEPER_SERVICE_INTERVAL,
+        unit);
+  }
+
+  @Override
+  public void cleanTheHouse() {

Review Comment:
   Done



##########
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/conf/MetastoreConf.java:
##########
@@ -95,13 +95,16 @@ public class MetastoreConf {
       
"org.apache.hadoop.hive.metastore.security.MetastoreDelegationTokenManager";
   @VisibleForTesting
   static final String ACID_HOUSE_KEEPER_SERVICE_CLASS =
-      "org.apache.hadoop.hive.metastore.txn.AcidHouseKeeperService";
+      "org.apache.hadoop.hive.metastore.txn.service.AcidHouseKeeperService";
+  @VisibleForTesting
+  static final String COMPACTION_HOUSE_KEEPER_SERVICE_CLASS =

Review Comment:
   Done



##########
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/service/AcidHouseKeeperService.java:
##########
@@ -78,17 +81,13 @@ public void run() {
     }
   }
 
-  private void cleanTheHouse() {
+  protected void cleanTheHouse() {
     performTask(txnHandler::performTimeOuts, "Cleaning timed out txns and 
locks");
     performTask(txnHandler::performWriteSetGC, "Cleaning obsolete write set 
entries");
     performTask(txnHandler::cleanTxnToWriteIdTable, "Cleaning obsolete 
TXN_TO_WRITE_ID entries");
-    if (isCompactorEnabled) {
-      performTask(txnHandler::removeDuplicateCompletedTxnComponents, "Cleaning 
duplicate COMPLETED_TXN_COMPONENTS entries");
-      performTask(txnHandler::purgeCompactionHistory, "Cleaning obsolete 
compaction history entries");
-    }
   }
 
-  private void performTask(FailableRunnable<MetaException> task, String 
description) {
+  void performTask(FailableRunnable<MetaException> task, String description) {
     long start = System.currentTimeMillis();
     Functions.run(task);

Review Comment:
   Done



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