/**
* 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;
import java.io.IOException;
import java.io.OutputStream;
import org.junit.*;
import static org.junit.Assert.fail;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
/**
* These tests make sure that DFSClient retries fetching data from DFS
* properly in case of errors.
*/
public class TestDFSClientExcludedNodes {
@Test
public void testExcludedNodes() throws IOException {
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(3).build();
FileSystem fs = cluster.getFileSystem();
Path filePath = new Path("/testExcludedNodes");
// kill a datanode
cluster.stopDataNode(AppendTestUtil.nextInt(3));
OutputStream out = fs.create(filePath, true, 4096);
out.write(20);
try {
out.close();
} catch (Exception e) {
fail("DataNode failure should not result in a block abort: \n" + e.getMessage());
}
}
}