Github user DT-Priyanka commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/216#discussion_r56630912
--- Diff: library/src/main/java/com/datatorrent/lib/io/fs/Synchronizer.java
---
@@ -0,0 +1,373 @@
+/**
+ * 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 com.datatorrent.lib.io.fs;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.validation.constraints.NotNull;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+
+import com.datatorrent.api.Context;
+import com.datatorrent.api.DefaultInputPort;
+import com.datatorrent.api.DefaultOutputPort;
+import com.datatorrent.common.util.BaseOperator;
+import com.datatorrent.lib.io.block.BlockMetadata;
+import com.datatorrent.lib.io.block.BlockMetadata.FileBlockMetadata;
+import com.datatorrent.lib.io.fs.AbstractFileSplitter.FileMetadata;
+import com.datatorrent.lib.io.fs.FileStitcher.BlockNotFoundException;
+
+/**
+ * Synchronizer waits for all data blocks for a file to be written to
disk. It
+ * sends trigger to merge the file only after all blocks are written to
HDFS
+ */
+public class Synchronizer extends BaseOperator
+{
+ /**
+ * Map to FileMetadata for given file
+ */
+ private Map<String, FileMetadata> fileMetadataMap = Maps.newHashMap();
+
+ /**
+ * Map maintaining BlockId to BlockMetadata mapping for given file
+ */
+ private Map<String, Map<Long, BlockMetadata.FileBlockMetadata>>
fileToReceivedBlocksMetadataMap = Maps.newHashMap();
+
+ public Synchronizer()
--- End diff --
No need of having this, java provides non parameterized constructor by
default if you don't have any other constructor in your class.
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