/**
* 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.hdfs.server.namenode.snapshot;
import java.util.ArrayList;
import org.apache.hadoop.hdfs.protocol.SnapshotException;
import org.apache.hadoop.hdfs.server.namenode.FSDirectory;
import org.apache.hadoop.hdfs.server.namenode.INode;
import org.junit.*;
import static org.mockito.Mockito.*;
/**
* Testing snapshot manager functionality.
*/
public class TestSnapshotManager {
private static final int testMaxSnapshotLimit = 7;
/**
* Test that the global limit on snapshots is honored.
*/
@Test (timeout=10000)
public void testSnapshotLimits() throws Exception {
// Setup mock objects for SnapshotManager.createSnapshot.
//
INodeDirectorySnapshottable ids = mock(INodeDirectorySnapshottable.class);
FSDirectory fsdir = mock(FSDirectory.class);
SnapshotManager sm = spy(new SnapshotManager(fsdir));
doReturn(ids).when(sm).getSnapshottableRoot(anyString());
doReturn(testMaxSnapshotLimit).when(sm).getMaxSnapshotID();
// Create testMaxSnapshotLimit snapshots. These should all succeed.
//
for (Integer i = 0; i < testMaxSnapshotLimit; ++i) {
sm.createSnapshot("dummy", i.toString());
}
// Attempt to create one more snapshot. This should fail due to snapshot
// ID rollover.
//
try {
sm.createSnapshot("dummy", "shouldFailSnapshot");
Assert.fail("Expected SnapshotException not thrown");
} catch (SnapshotException se) {
Assert.assertTrue(
se.getMessage().toLowerCase().contains("rollover"));
}
// Delete a snapshot to free up a slot.
//
sm.deleteSnapshot("", "", mock(INode.BlocksMapUpdateInfo.class), new ArrayList<INode>());
// Attempt to create a snapshot again. It should still fail due
// to snapshot ID rollover.
//
try {
sm.createSnapshot("dummy", "shouldFailSnapshot2");
Assert.fail("Expected SnapshotException not thrown");
} catch (SnapshotException se) {
Assert.assertTrue(
se.getMessage().toLowerCase().contains("rollover"));
}
}
}