1 files changed, 46 insertions, 0 deletions
diff --git a/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/interfaces/ContainerDeletionChoosingPolicy.java b/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/interfaces/ContainerDeletionChoosingPolicy.java
new file mode 100644
index 0000000000..f7280e2a3c
--- /dev/null
+++ b/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/interfaces/ContainerDeletionChoosingPolicy.java
@@ -0,0 +1,46 @@
+/**
+ * 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.ozone.container.common.interfaces;
+
+import org.apache.hadoop.hdds.scm.container.common.helpers
+    .StorageContainerException;
+import org.apache.hadoop.ozone.container.common.helpers.ContainerData;
+import org.apache.hadoop.ozone.container.common.impl.ContainerStatus;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ * This interface is used for choosing desired containers for
+ * block deletion.
+ */
+public interface ContainerDeletionChoosingPolicy {
+
+  /**
+   * Chooses desired containers for block deletion.
+   * @param count
+   *          how many to return
+   * @param candidateContainers
+   *          candidate containers collection
+   * @return container data list
+   * @throws StorageContainerException
+   */
+  List<ContainerData> chooseContainerForBlockDeletion(int count,
+      Map<String, ContainerStatus> candidateContainers)
+      throws StorageContainerException;
+}