solr/core/src/test/org/apache/solr/cloud/hdfs/HdfsThreadLeakTest.java

/*
 * 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.
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package org.apache.solr.cloud.hdfs;

import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.lucene.util.QuickPatchThreadsFilter;
import org.apache.solr.SolrIgnoredThreadsFilter;
import org.apache.solr.SolrTestCaseJ4;
import org.apache.solr.util.BadHdfsThreadsFilter;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

import com.carrotsearch.randomizedtesting.annotations.ThreadLeakFilters;

@ThreadLeakFilters(defaultFilters = true, filters = {
    SolrIgnoredThreadsFilter.class,
    QuickPatchThreadsFilter.class,
    BadHdfsThreadsFilter.class // hdfs currently leaks thread(s)
})
public class HdfsThreadLeakTest extends SolrTestCaseJ4 {
  private static MiniDFSCluster dfsCluster;

  @BeforeClass
  public static void beforeClass() throws Exception {
    dfsCluster = HdfsTestUtil.setupClass(createTempDir().toFile().getAbsolutePath(), false, false);
  }

  @AfterClass
  public static void afterClass() throws Exception {
    try {
      HdfsTestUtil.teardownClass(dfsCluster);
    } finally {
      dfsCluster = null;
    }
  }
  
  @Test
  public void testBasic() throws IOException {
    String uri = HdfsTestUtil.getURI(dfsCluster);
    Path path = new Path(uri);
    Configuration conf = HdfsTestUtil.getClientConfiguration(dfsCluster);
    try(FileSystem fs = FileSystem.get(path.toUri(), conf)) {
      Path testFile = new Path(uri + "/testfile");
      try(FSDataOutputStream out = fs.create(testFile)) {
        out.write(5);
        out.hflush();
      }

      ((DistributedFileSystem) fs).recoverLease(testFile);
    }
  }
}