HDFS-15211. EC: File write hangs during close in case of Exception during updatePipeline. Contributed by Ayush Saxena.

*Added missed test file.

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedOutputStreamUpdatePipeline.java

@@ -0,0 +1,64 @@
+/**
+ * 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 org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.io.IOUtils;
+import org.junit.Test;
+
+
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCK_SIZE_KEY;
+
+public class TestDFSStripedOutputStreamUpdatePipeline {
+
+  @Test
+  public void testDFSStripedOutputStreamUpdatePipeline() throws Exception {
+
+    Configuration conf = new HdfsConfiguration();
+    conf.setLong(DFS_BLOCK_SIZE_KEY, 1 * 1024 * 1024);
+    try (MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
+        .numDataNodes(5).build()) {
+      cluster.waitActive();
+      final DistributedFileSystem dfs = cluster.getFileSystem();
+      // Create a file with EC policy
+      Path dir = new Path("/test");
+      dfs.mkdirs(dir);
+      dfs.enableErasureCodingPolicy("RS-3-2-1024k");
+      dfs.setErasureCodingPolicy(dir, "RS-3-2-1024k");
+      Path filePath = new Path("/test/file");
+      FSDataOutputStream out = dfs.create(filePath);
+      try {
+        for (int i = 0; i < Long.MAX_VALUE; i++) {
+          out.write(i);
+          if (i == 1024 * 1024 * 5) {
+            cluster.stopDataNode(0);
+            cluster.stopDataNode(1);
+            cluster.stopDataNode(2);
+          }
+        }
+      } catch(Exception e) {
+        dfs.delete(filePath, true);
+      } finally {
+        // The close should be success, shouldn't get stuck.
+        IOUtils.closeStream(out);
+      }
+    }
+  }
+}