/**
* 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.ha;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.io.IOUtils;
import org.junit.Test;
/**
* Make sure HA-related metrics are updated and reported appropriately.
*/
public class TestHAMetrics {
private static final Log LOG = LogFactory.getLog(TestHAMetrics.class);
@Test
public void testHAMetrics() throws Exception {
Configuration conf = new Configuration();
conf.setInt(DFSConfigKeys.DFS_HA_TAILEDITS_PERIOD_KEY, 1);
conf.setInt(DFSConfigKeys.DFS_HA_LOGROLL_PERIOD_KEY, Integer.MAX_VALUE);
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
.nnTopology(MiniDFSNNTopology.simpleHATopology()).numDataNodes(1)
.build();
FileSystem fs = null;
try {
cluster.waitActive();
FSNamesystem nn0 = cluster.getNamesystem(0);
FSNamesystem nn1 = cluster.getNamesystem(1);
assertEquals(nn0.getHAState(), "standby");
assertTrue(0 < nn0.getMillisSinceLastLoadedEdits());
assertEquals(nn1.getHAState(), "standby");
assertTrue(0 < nn1.getMillisSinceLastLoadedEdits());
cluster.transitionToActive(0);
assertEquals("active", nn0.getHAState());
assertEquals(0, nn0.getMillisSinceLastLoadedEdits());
assertEquals("standby", nn1.getHAState());
assertTrue(0 < nn1.getMillisSinceLastLoadedEdits());
cluster.transitionToStandby(0);
cluster.transitionToActive(1);
assertEquals("standby", nn0.getHAState());
assertTrue(0 < nn0.getMillisSinceLastLoadedEdits());
assertEquals("active", nn1.getHAState());
assertEquals(0, nn1.getMillisSinceLastLoadedEdits());
Thread.sleep(2000); // make sure standby gets a little out-of-date
assertTrue(2000 <= nn0.getMillisSinceLastLoadedEdits());
assertEquals(0, nn0.getPendingDataNodeMessageCount());
assertEquals(0, nn1.getPendingDataNodeMessageCount());
fs = HATestUtil.configureFailoverFs(cluster, conf);
DFSTestUtil.createFile(fs, new Path("/foo"),
10, (short)1, 1L);
assertTrue(0 < nn0.getPendingDataNodeMessageCount());
assertEquals(0, nn1.getPendingDataNodeMessageCount());
long millisSinceLastLoadedEdits = nn0.getMillisSinceLastLoadedEdits();
HATestUtil.waitForStandbyToCatchUp(cluster.getNameNode(1),
cluster.getNameNode(0));
assertEquals(0, nn0.getPendingDataNodeMessageCount());
assertEquals(0, nn1.getPendingDataNodeMessageCount());
long newMillisSinceLastLoadedEdits = nn0.getMillisSinceLastLoadedEdits();
// Since we just waited for the standby to catch up, the time since we
// last loaded edits should be very low.
assertTrue("expected " + millisSinceLastLoadedEdits + " > " +
newMillisSinceLastLoadedEdits,
millisSinceLastLoadedEdits > newMillisSinceLastLoadedEdits);
} finally {
IOUtils.cleanup(LOG, fs);
cluster.shutdown();
}
}
}