svn merge -c 1532860 from trunk for adding TestOpenFilesWithSnapshot.java for HDFS-5283.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1532861 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestOpenFilesWithSnapshot.java

@@ -0,0 +1,113 @@
+/**
+ * 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.io.IOException;
+import java.util.EnumSet;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.DFSOutputStream;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.client.HdfsDataOutputStream.SyncFlag;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class TestOpenFilesWithSnapshot {
+  private Configuration conf = new Configuration();
+  MiniDFSCluster cluster = null;
+  DistributedFileSystem fs = null;
+
+  @Before
+  public void setup() throws IOException {
+    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(3).build();
+    conf.set("dfs.blocksize", "1048576");
+    fs = cluster.getFileSystem();
+  }
+
+  @After
+  public void teardown() throws IOException {
+    if (fs != null) {
+      fs.close();
+    }
+    if (cluster != null) {
+      cluster.shutdown();
+    }
+
+  }
+
+  @Test
+  public void testUCFileDeleteWithSnapShot() throws Exception {
+    Path path = new Path("/test");
+    doWriteAndAbort(fs, path);
+
+    // delete files separately
+    fs.delete(new Path("/test/test/test2"), true);
+    fs.delete(new Path("/test/test/test3"), true);
+    cluster.restartNameNode();
+  }
+
+  @Test
+  public void testParentDirWithUCFileDeleteWithSnapShot() throws Exception {
+    Path path = new Path("/test");
+    doWriteAndAbort(fs, path);
+
+    // delete parent directory
+    fs.delete(new Path("/test/test"), true);
+    cluster.restartNameNode();
+  }
+
+  private void doWriteAndAbort(DistributedFileSystem fs, Path path)
+      throws IOException {
+    fs.mkdirs(path);
+    fs.allowSnapshot(path);
+    DFSTestUtil
+        .createFile(fs, new Path("/test/test1"), 100, (short) 2, 100024L);
+    DFSTestUtil
+        .createFile(fs, new Path("/test/test2"), 100, (short) 2, 100024L);
+    Path file = new Path("/test/test/test2");
+    FSDataOutputStream out = fs.create(file);
+    for (int i = 0; i < 2; i++) {
+      long count = 0;
+      while (count < 1048576) {
+        out.writeBytes("hell");
+        count += 4;
+      }
+    }
+    ((DFSOutputStream) out.getWrappedStream()).hsync(EnumSet
+        .of(SyncFlag.UPDATE_LENGTH));
+    DFSTestUtil.abortStream((DFSOutputStream) out.getWrappedStream());
+    Path file2 = new Path("/test/test/test3");
+    FSDataOutputStream out2 = fs.create(file2);
+    for (int i = 0; i < 2; i++) {
+      long count = 0;
+      while (count < 1048576) {
+        out2.writeBytes("hell");
+        count += 4;
+      }
+    }
+    ((DFSOutputStream) out2.getWrappedStream()).hsync(EnumSet
+        .of(SyncFlag.UPDATE_LENGTH));
+    DFSTestUtil.abortStream((DFSOutputStream) out2.getWrappedStream());
+    fs.createSnapshot(path, "s1");
+  }
+}