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From DT-Priyanka <...@git.apache.org>
Subject [GitHub] incubator-apex-malhar pull request: APEXMALHAR-2013 : HDFS output ...
Date Fri, 18 Mar 2016 08:39:15 GMT
Github user DT-Priyanka commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/216#discussion_r56625652
  
    --- Diff: library/src/main/java/com/datatorrent/lib/io/fs/FileMerger.java ---
    @@ -0,0 +1,161 @@
    +/**
    + * 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.OutputStream;
    +
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import org.apache.hadoop.fs.Path;
    +
    +import com.datatorrent.api.AutoMetric;
    +import com.datatorrent.api.Context;
    +import com.datatorrent.api.Context.OperatorContext;
    +import com.datatorrent.lib.io.fs.Synchronizer.OutputFileMetadata;
    +
    +/**
    + * This operator merges the blocks into a file. The list of blocks is obtained
    + * from the OutputFileMetadata. The implementation extends FileStitcher (which
    + * uses reconciler), hence the file merging operation is carried out in a
    + * separate thread.
    + *
    + */
    +public class FileMerger extends FileStitcher<OutputFileMetadata>
    +{
    +  /**
    +   * Flag to control if existing file with same name should be overwritten
    +   */
    +  private boolean overwriteOnConflict = true;
    +
    +  private static final Logger LOG = LoggerFactory.getLogger(FileMerger.class);
    +
    +  @AutoMetric
    +  private long bytesWrittenPerSec;
    +
    +  private long bytesWritten;
    +  private double windowTimeSec;
    +
    +  @Override
    +  public void setup(OperatorContext context)
    +  {
    +    super.setup(context);
    +    windowTimeSec = (context.getValue(Context.OperatorContext.APPLICATION_WINDOW_COUNT)
    +        * context.getValue(Context.DAGContext.STREAMING_WINDOW_SIZE_MILLIS) * 1.0) /
1000.0;
    +  }
    +
    +  @Override
    +  public void beginWindow(long windowId)
    +  {
    +    super.beginWindow(windowId);
    +    bytesWrittenPerSec = 0;
    +    bytesWritten = 0;
    +  }
    +
    +  /* 
    +   * Calls super.endWindow() and sets counters 
    +   * @see com.datatorrent.api.BaseOperator#endWindow()
    +   */
    +  @Override
    +  public void endWindow()
    +  {
    +    OutputFileMetadata outputFileMetadata;
    +    int size = doneTuples.size();
    +    for (int i = 0; i < size; i++) {
    +      outputFileMetadata = doneTuples.peek();
    +      // If a tuple is present in doneTuples, it has to be also present in successful/failed/skipped
    +      // as processCommittedData adds tuple in successful/failed/skipped
    +      // and then reconciler thread add that in doneTuples 
    +      if (successfulFiles.contains(outputFileMetadata)) {
    +        successfulFiles.remove(outputFileMetadata);
    +        LOG.debug("File copy successful: {}", outputFileMetadata.getStitchedFileRelativePath());
    +      } else if (skippedFiles.contains(outputFileMetadata)) {
    +        skippedFiles.remove(outputFileMetadata);
    +        LOG.debug("File copy skipped: {}", outputFileMetadata.getStitchedFileRelativePath());
    +      } else if (failedFiles.contains(outputFileMetadata)) {
    +        failedFiles.remove(outputFileMetadata);
    +        LOG.debug("File copy failed: {}", outputFileMetadata.getStitchedFileRelativePath());
    +      } else {
    +        throw new RuntimeException("Tuple present in doneTuples but not in successfulFiles:
"
    --- End diff --
    
    minor: message cannot say "but not in successfulFiles" it can be sucess/skip/error.


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