[GitHub] [hbase] virajjasani commented on a change in pull request #371: HBASE-22648 : Introducing Snapshot TTL

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virajjasani commented on a change in pull request #371: HBASE-22648 : Introducing Snapshot TTL
URL: https://github.com/apache/hbase/pull/371#discussion_r302403318
 
 

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 File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/cleaner/SnapshotCleanerChore.java
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+/*
+ * 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
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.hbase.master.cleaner;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.ScheduledChore;
+import org.apache.hadoop.hbase.Stoppable;
+import org.apache.hadoop.hbase.master.snapshot.SnapshotManager;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos;
+import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
+import org.apache.hbase.thirdparty.org.apache.commons.collections4.CollectionUtils;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.List;
+
+/**
+ * This chore, every time it runs, will try to delete snapshots that are expired based on TTL in
+ * seconds configured for each Snapshot
+ */
+@InterfaceAudience.Private
+public class SnapshotCleanerChore extends ScheduledChore {
+
+  private static final Logger LOGGER = LoggerFactory.getLogger(SnapshotCleanerChore.class);
+  private static final String SNAPSHOT_CLEANER_CHORE_NAME = "SnapshotCleaner";
+  private static final String SNAPSHOT_CLEANER_INTERVAL = "hbase.master.cleaner.snapshot.interval";
+  private static final int SNAPSHOT_CLEANER_DEFAULT_INTERVAL = 600 * 1000; // Default 10 min
+  private static final String DELETE_SNAPSHOT_EVENT =
+          "Eligible Snapshot for cleanup due to expired TTL.";
+
+  private final SnapshotManager snapshotManager;
+
+  public SnapshotCleanerChore(Stoppable stopper, Configuration configuration,
+          SnapshotManager snapshotManager) {
+    super(SNAPSHOT_CLEANER_CHORE_NAME, stopper, configuration.getInt(SNAPSHOT_CLEANER_INTERVAL,
+            SNAPSHOT_CLEANER_DEFAULT_INTERVAL));
+    this.snapshotManager = snapshotManager;
+  }
+
+  @Override
+  protected void chore() {
+    LOGGER.trace("Snapshot Cleaner Chore is starting up...");
 
 Review comment:
   What you are suggesting is adding a config to disable and restart HMaster(sort of EBF release) should disable running this chore as I can have a check here that only if the config is not disabled, perform all these steps?
   Is that correct?

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