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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APEXMALHAR-2013) HDFS output module for file copy
Date Fri, 18 Mar 2016 09:29:33 GMT

    [ https://issues.apache.org/jira/browse/APEXMALHAR-2013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15201241#comment-15201241
] 

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_r56630486
  
    --- Diff: library/src/main/java/com/datatorrent/lib/io/fs/HDFSFileMerger.java ---
    @@ -0,0 +1,218 @@
    +/**
    + * 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 org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import org.apache.hadoop.fs.FileStatus;
    +import org.apache.hadoop.fs.FileSystem;
    +import org.apache.hadoop.fs.Path;
    +
    +import com.google.common.annotations.VisibleForTesting;
    +
    +import com.datatorrent.api.Context.OperatorContext;
    +import com.datatorrent.lib.io.fs.Synchronizer.OutputFileMetadata;
    +
    +/**
    + * HDFS file merger extends file merger to optimize for HDFS file copy usecase.
    + * This uses fast merge from HDFS if destination filesystem is same as
    + * application filesystem.
    + */
    +public class HDFSFileMerger extends FileMerger
    +{
    +  /**
    +   * Fast merge is possible if append is allowed for output file system.
    +   */
    +  private transient boolean fastMergeActive;
    --- End diff --
    
    why we need this flag if we have FastMergeDecisionMaker?


> 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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