apex-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From DT-Priyanka <...@git.apache.org>
Subject [GitHub] incubator-apex-malhar pull request: APEXMALHAR-2013 : HDFS output ...
Date Fri, 18 Mar 2016 09:06:06 GMT
Github user DT-Priyanka commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/216#discussion_r56627887
  
    --- Diff: library/src/main/java/com/datatorrent/lib/io/fs/FileStitcher.java ---
    @@ -0,0 +1,408 @@
    +/**
    + * 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 java.util.Queue;
    +
    +import javax.validation.constraints.NotNull;
    +
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.fs.FileStatus;
    +import org.apache.hadoop.fs.FileSystem;
    +import org.apache.hadoop.fs.Path;
    +import org.apache.hadoop.fs.PathFilter;
    +
    +import com.google.common.collect.Queues;
    +
    +import com.datatorrent.api.Context;
    +import com.datatorrent.api.Context.DAGContext;
    +import com.datatorrent.api.DefaultOutputPort;
    +import com.datatorrent.api.annotation.OutputPortFieldAnnotation;
    +import com.datatorrent.lib.io.fs.Synchronizer.StitchBlock;
    +import com.datatorrent.lib.io.fs.Synchronizer.StitchedFileMetaData;
    +
    +/**
    + * This is generic File Stitcher which can be used to merge data from one or
    + * more files into single stitched file. StitchedFileMetaData defines
    + * constituents of the stitched file.
    + * 
    + * This class uses Reconciler to
    + */
    +public class FileStitcher<T extends StitchedFileMetaData> extends AbstractReconciler<T,
T>
    +{
    +  /**
    +   * Filesystem on which application is running
    +   */
    +  protected transient FileSystem appFS;
    +
    +  /**
    +   * Destination file system
    +   */
    +  protected transient FileSystem outputFS;
    +
    +  /**
    +   * Path for destination directory
    +   */
    +  @NotNull
    +  protected String filePath;
    +
    +  /**
    +   * Path for blocks directory
    +   */
    +  protected transient String blocksDir;
    +
    +  protected static final String PART_FILE_EXTENTION = "._COPYING_";
    +
    +  /**
    +   * Queue maintaining successful files
    +   */
    +  protected Queue<T> successfulFiles = Queues.newLinkedBlockingQueue();
    +
    +  /**
    +   * Queue maintaining skipped files
    +   */
    +  protected Queue<T> skippedFiles = Queues.newLinkedBlockingQueue();
    +
    +  /**
    +   * Queue maintaining failed files
    +   */
    +  protected Queue<T> failedFiles = Queues.newLinkedBlockingQueue();
    +
    +  /**
    +   * Output port for emitting completed stitched files metadata
    +   */
    +  @OutputPortFieldAnnotation(optional = true)
    +  public final transient DefaultOutputPort<T> completedFilesMetaOutput = new DefaultOutputPort<T>();
    +
    +  private boolean writeChecksum = true;
    +  protected transient Path tempOutFilePath;
    +
    +  @Override
    +  public void setup(Context.OperatorContext context)
    +  {
    +
    +    blocksDir = context.getValue(DAGContext.APPLICATION_PATH) + Path.SEPARATOR + BlockWriter.SUBDIR_BLOCKS;
    +
    +    try {
    +      outputFS = getOutputFSInstance();
    +      outputFS.setWriteChecksum(writeChecksum);
    +    } catch (IOException ex) {
    +      throw new RuntimeException("Exception in getting output file system.", ex);
    +    }
    +    try {
    +      appFS = getAppFSInstance();
    +    } catch (IOException ex) {
    +      try {
    +        outputFS.close();
    +      } catch (IOException e) {
    +        throw new RuntimeException("Exception in closing output file system.", e);
    +      }
    +      throw new RuntimeException("Exception in getting application file system.", ex);
    +    }
    +
    +    super.setup(context); // Calling it at the end as the reconciler thread uses resources
allocated above.
    +  }
    +
    +  /* 
    +   * Calls super.endWindow() and sets counters 
    +   * @see com.datatorrent.api.BaseOperator#endWindow()
    +   */
    +  @Override
    +  public void endWindow()
    +  {
    +    T stitchedFileMetaData;
    +    int size = doneTuples.size();
    +    for (int i = 0; i < size; i++) {
    +      stitchedFileMetaData = 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(stitchedFileMetaData)) {
    +        successfulFiles.remove(stitchedFileMetaData);
    +        LOG.debug("File copy successful: {}", stitchedFileMetaData.getStitchedFileRelativePath());
    +      } else if (skippedFiles.contains(stitchedFileMetaData)) {
    +        skippedFiles.remove(stitchedFileMetaData);
    +        LOG.debug("File copy skipped: {}", stitchedFileMetaData.getStitchedFileRelativePath());
    +      } else if (failedFiles.contains(stitchedFileMetaData)) {
    +        failedFiles.remove(stitchedFileMetaData);
    +        LOG.debug("File copy failed: {}", stitchedFileMetaData.getStitchedFileRelativePath());
    +      } else {
    +        throw new RuntimeException("Tuple present in doneTuples but not in successfulFiles:
"
    +            + stitchedFileMetaData.getStitchedFileRelativePath());
    +      }
    +      completedFilesMetaOutput.emit(stitchedFileMetaData);
    +      committedTuples.remove(stitchedFileMetaData);
    +      doneTuples.poll();
    +    }
    +  }
    +
    +  /**
    +   * 
    +   * @return Application FileSystem instance
    +   * @throws IOException
    +   */
    +  protected FileSystem getAppFSInstance() throws IOException
    +  {
    +    return FileSystem.newInstance((new Path(blocksDir)).toUri(), new Configuration());
    +  }
    +
    +  /**
    +   * 
    +   * @return Destination FileSystem instance
    +   * @throws IOException
    +   */
    +  protected FileSystem getOutputFSInstance() throws IOException
    +  {
    +    return FileSystem.newInstance((new Path(filePath)).toUri(), new Configuration());
    +  }
    +
    +  @Override
    +  public void teardown()
    +  {
    +    super.teardown();
    +
    +    boolean gotException = false;
    +    try {
    +      if (appFS != null) {
    +        appFS.close();
    +        appFS = null;
    +      }
    +    } catch (IOException e) {
    +      gotException = true;
    +    }
    +
    +    try {
    +      if (outputFS != null) {
    +        outputFS.close();
    +        outputFS = null;
    +      }
    +    } catch (IOException e) {
    +      gotException = true;
    +    }
    +    if (gotException) {
    +      throw new RuntimeException("Exception while closing file systems.");
    +    }
    +  }
    +
    +  /**
    +   * Enques incoming data for for processing
    +   */
    +  @Override
    +  protected void processTuple(T stitchedFileMetaData)
    +  {
    +    enqueueForProcessing(stitchedFileMetaData);
    +  }
    +
    +  /**
    +   * Stitches the output file when all blocks for that file are commited
    +   */
    +  @Override
    +  protected void processCommittedData(T stitchedFileMetaData)
    +  {
    +    try {
    +      mergeOutputFile(stitchedFileMetaData);
    +    } catch (IOException e) {
    +      throw new RuntimeException("Unable to merge file: " + stitchedFileMetaData.getStitchedFileRelativePath(),
e);
    +    }
    +  }
    +
    +  /**
    +   * Read data from block files and write to output file. Information about
    +   * which block files should be read is specified in outFileMetadata
    +   * 
    +   * @param stitchedFileMetaData
    +   * @throws IOException
    +   */
    +
    +  protected void mergeOutputFile(T stitchedFileMetaData) throws IOException
    +  {
    +    mergeBlocks(stitchedFileMetaData);
    +    successfulFiles.add(stitchedFileMetaData);
    +    LOG.debug("Completed processing file: {} ", stitchedFileMetaData.getStitchedFileRelativePath());
    +  }
    +
    +  protected void mergeBlocks(T stitchedFileMetaData) throws IOException
    +  {
    +    //when writing to tmp files there can be vagrant tmp files which we have to clean
    +    final Path dst = new Path(filePath, stitchedFileMetaData.getStitchedFileRelativePath());
    +    PathFilter tempFileFilter = new PathFilter()
    +    {
    +      @Override
    +      public boolean accept(Path path)
    +      {
    +        return path.getName().startsWith(dst.getName()) && path.getName().endsWith(PART_FILE_EXTENTION);
    +      }
    +    };
    +    if (outputFS.exists(dst.getParent())) {
    +      FileStatus[] statuses = outputFS.listStatus(dst.getParent(), tempFileFilter);
    +      for (FileStatus status : statuses) {
    +        String statusName = status.getPath().getName();
    +        LOG.debug("deleting vagrant file {}", statusName);
    +        outputFS.delete(status.getPath(), true);
    +      }
    +    }
    +    tempOutFilePath = new Path(filePath,
    +        stitchedFileMetaData.getStitchedFileRelativePath() + '.' + System.currentTimeMillis()
+ PART_FILE_EXTENTION);
    +    try {
    +      writeTempOutputFile(stitchedFileMetaData);
    +      moveToFinalFile(stitchedFileMetaData);
    +    } catch (BlockNotFoundException e) {
    +      LOG.info("Block file {} not found. Assuming recovery mode for file {}. ", e.getBlockPath(),
    +          stitchedFileMetaData.getStitchedFileRelativePath());
    +      //Remove temp output file
    +      outputFS.delete(tempOutFilePath, false);
    +    }
    +  }
    +
    +  /**
    +   * Writing all Stitch blocks to temporary file
    +   * 
    +   * @param stitchedFileMetaData
    +   * @throws IOException
    +   * @throws BlockNotFoundException
    +   */
    +  protected OutputStream writeTempOutputFile(T stitchedFileMetaData) throws IOException,
BlockNotFoundException
    +  {
    +    OutputStream outputStream = getOutputStream(tempOutFilePath);
    +    try {
    +      for (StitchBlock outputBlock : stitchedFileMetaData.getStitchBlocksList()) {
    +        outputBlock.writeTo(appFS, blocksDir, outputStream);
    +      }
    +    } finally {
    +      outputStream.close();
    +    }
    +    return outputStream;
    +  }
    +
    +  protected OutputStream getOutputStream(Path partFilePath) throws IOException
    +  {
    +    return outputFS.create(partFilePath);
    +  }
    +
    +  /**
    +   * Moving temp output file to final file
    +   * 
    +   * @param stitchedFileMetaData
    +   * @throws IOException
    +   */
    +  protected void moveToFinalFile(T stitchedFileMetaData) throws IOException
    +  {
    +    Path destination = new Path(filePath, stitchedFileMetaData.getStitchedFileRelativePath());
    +    moveToFinalFile(tempOutFilePath, destination);
    +  }
    +
    +  /**
    +   * Moving temp output file to final file
    +   * 
    +   * @param tempOutFilePath
    +   *          Temporary output file
    +   * @param destination
    +   *          Destination directory path
    +   * @throws IOException
    +   */
    +  protected void moveToFinalFile(Path tempOutFilePath, Path destination) throws IOException
    +  {
    +    Path src = Path.getPathWithoutSchemeAndAuthority(tempOutFilePath);
    +    Path dst = Path.getPathWithoutSchemeAndAuthority(destination);
    +
    +    boolean moveSuccessful = false;
    +    if (!outputFS.exists(dst.getParent())) {
    +      outputFS.mkdirs(dst.getParent());
    +    }
    +    if (outputFS.exists(dst)) {
    +      outputFS.delete(dst, false);
    +    }
    +    moveSuccessful = outputFS.rename(src, dst);
    +
    +    if (moveSuccessful) {
    +      LOG.debug("File {} moved successfully to destination folder.", dst);
    +    } else {
    +      throw new RuntimeException("Unable to move file from " + src + " to " + dst);
    +    }
    +  }
    +
    +  public String getBlocksDir()
    +  {
    +    return blocksDir;
    +  }
    +
    +  public void setBlocksDir(String blocksDir)
    --- End diff --
    
    just put javadocs on all getter/setters



---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---

Mime
View raw message