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https://issues.apache.org/jira/browse/APEXMALHAR-2013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15201227#comment-15201227
]
ASF GitHub Bot commented on APEXMALHAR-2013:
--------------------------------------------
Github user DT-Priyanka commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/216#discussion_r56628725
--- Diff:
library/src/main/java/com/datatorrent/lib/io/fs/HDFSFileCopyModule.java ---
@@ -0,0 +1,123 @@
+/**
+ * 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 javax.validation.constraints.NotNull;
+
+import org.apache.hadoop.conf.Configuration;
+
+import com.datatorrent.api.Context.PortContext;
+import com.datatorrent.api.DAG;
+import com.datatorrent.api.Module;
+import com.datatorrent.lib.io.block.AbstractBlockReader.ReaderRecord;
+import com.datatorrent.lib.io.block.BlockMetadata;
+import com.datatorrent.lib.io.fs.AbstractFileSplitter.FileMetadata;
+import com.datatorrent.netlet.util.Slice;
+
+/**
+ * HDFS file copy module can be used in conjunction with file input
modules to
+ * copy files from any file system to HDFS. This module supports parallel
write
+ * to multiple blocks of the same file and then stitching those blocks in
+ * original sequence.
+ *
+ * Essential operators are wrapped into single component using Module API.
+ *
+ */
+public class HDFSFileCopyModule implements Module
+{
+
+ /**
+ * Path of the output directory. Relative path of the files copied will
be
+ * maintained w.r.t. source directory and output directory
+ */
+ @NotNull
+ protected String outputDirectoryPath;
+
+ /**
+ * Flag to control if existing file with same name should be overwritten
+ */
+ private boolean overwriteOnConflict;
+
+ /**
+ * Input port for files metadata.
+ */
+ public final transient ProxyInputPort<FileMetadata> filesMetadataInput =
new ProxyInputPort<FileMetadata>();
+
+ /**
+ * Input port for blocks metadata
+ */
+ public final transient ProxyInputPort<BlockMetadata.FileBlockMetadata>
blocksMetadataInput = new ProxyInputPort<BlockMetadata.FileBlockMetadata>();
+
+ /**
+ * Input port for blocks data
+ */
+ public final transient ProxyInputPort<ReaderRecord<Slice>> blockData =
new ProxyInputPort<ReaderRecord<Slice>>();
+
+ @Override
+ public void populateDAG(DAG dag, Configuration conf)
+ {
+
+ //Defining DAG
+ BlockWriter blockWriter = dag.addOperator("BlockWriter", new
BlockWriter());
+ Synchronizer synchronizer = dag.addOperator("BlockSynchronizer", new
Synchronizer());
+
+ dag.setInputPortAttribute(blockWriter.input,
PortContext.PARTITION_PARALLEL, true);
+ dag.setInputPortAttribute(blockWriter.blockMetadataInput,
PortContext.PARTITION_PARALLEL, true);
+ dag.addStream("CompletedBlockmetadata",
blockWriter.blockMetadataOutput, synchronizer.blocksMetadataInput);
+
+ HDFSFileMerger merger = new HDFSFileMerger();
+ merger = dag.addOperator("FileMerger", merger);
+ dag.addStream("MergeTrigger", synchronizer.trigger, merger.input);
+
+ //DevNull<OutputFileMetadata> devNull1 = dag.addOperator("devNull1",
DevNull.class);
+ //dag.addStream("ignored", merger.completedFilesMetaOutput,
devNull1.data);
+
+ //Setting operator properties
+ merger.setFilePath(outputDirectoryPath);
+ merger.setOverwriteOnConflict(overwriteOnConflict);
+
+ //Binding proxy ports
+ filesMetadataInput.set(synchronizer.filesMetadataInput);
+ blocksMetadataInput.set(blockWriter.blockMetadataInput);
+ blockData.set(blockWriter.input);
+
+ }
+
+ public String getOutputDirectoryPath()
--- End diff --
javadocs.
> HDFS output module for file copy
> --------------------------------
>
> Key: APEXMALHAR-2013
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2013
> Project: Apache Apex Malhar
> Issue Type: Task
> Reporter: Yogi Devendra
> Assignee: Yogi Devendra
>
> To write files to HDFS using block-by-block approach.
> Main use-case being to copy the files. Thus, original sequence of blocks has
> to be maintained.
> To achieve this goal, this module would use information emitted by HDFS
> input module (APEXMALHAR-2008) viz. FileMetaData, BlockMetaData, BlockData.
>
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