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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5944) Flink should support reading Snappy Files
Date Tue, 19 Sep 2017 13:38:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16171711#comment-16171711
] 

ASF GitHub Bot commented on FLINK-5944:
---------------------------------------

GitHub user mlipkovich opened a pull request:

    https://github.com/apache/flink/pull/4683

    [FLINK-5944] Support reading of Snappy files

    ## What is the purpose of the change
    
    Support reading of Snappy compressed text files (both Xerial and Hadoop snappy)
    
    ## Brief change log
    
      - *Added InputStreamFactories for Xerial and Hadoop snappy*
      - *Added config parameter to control whether Xerial or Hadoop snappy should be used*
    
    ## Verifying this change
    
      - *Manually verified the change by running word count for text files compressed using
different Snappy versions*
    
    ## Does this pull request potentially affect one of the following parts:
    
      - Dependencies (does it add or upgrade a dependency): no
      - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: no
      - The serializers: no
      - The runtime per-record code paths (performance sensitive): no
      - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing,
Yarn/Mesos, ZooKeeper: no
    
    ## Documentation
    
      - Does this pull request introduce a new feature? yes
      - If yes, how is the feature documented? JavaDocs 
    


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/mlipkovich/flink FLINK-5944

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/4683.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #4683
    
----
commit c4d4016f1e6b44833d24994c97532b4c5243e4d2
Author: Mikhail Lipkovich <mikhail_lipkovich@epam.com>
Date:   2017-09-19T13:34:10Z

    [FLINK-5944] Support reading of Snappy files

----


> Flink should support reading Snappy Files
> -----------------------------------------
>
>                 Key: FLINK-5944
>                 URL: https://issues.apache.org/jira/browse/FLINK-5944
>             Project: Flink
>          Issue Type: New Feature
>          Components: Batch Connectors and Input/Output Formats
>            Reporter: Ilya Ganelin
>            Assignee: Mikhail Lipkovich
>              Labels: features
>
> Snappy is an extremely performant compression format that's widely used offering fast
decompression/compression. 
> This can be easily implemented by creating a SnappyInflaterInputStreamFactory and updating
the initDefaultInflateInputStreamFactories in FileInputFormat.
> Flink already includes the Snappy dependency in the project. 
> There is a minor gotcha in this. If we wish to use this with Hadoop, then we must provide
two separate implementations since Hadoop uses a different version of the snappy format than
Snappy Java (which is the xerial/snappy included in Flink). 



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