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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10047) Add a directbuffer Decompressor API to hadoop
Date Thu, 31 Oct 2013 11:19:18 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gopal V updated HADOOP-10047:
-----------------------------

        Fix Version/s: 2.3.0
    Affects Version/s: 2.3.0
         Release Note: Direct Bytebuffer decompressors for Zlib (Deflate & Gzip) and Snappy

               Status: Patch Available  (was: Open)

> Add a directbuffer Decompressor API to hadoop
> ---------------------------------------------
>
>                 Key: HADOOP-10047
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10047
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: io
>    Affects Versions: 2.3.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>              Labels: compression
>             Fix For: 2.3.0
>
>         Attachments: DirectCompressor.html, DirectDecompressor.html, HADOOP-10047-WIP.patch,
HADOOP-10047-final.patch, HADOOP-10047-redo-WIP.patch, HADOOP-10047-with-tests.patch
>
>
> With the Zero-Copy reads in HDFS (HDFS-5260), it becomes important to perform all I/O
operations without copying data into byte[] buffers or other buffers which wrap over them.
> This is a proposal for adding a DirectDecompressor interface to the io.compress, to indicate
codecs which want to surface the direct buffer layer upwards.
> The implementation should work with direct heap/mmap buffers and cannot assume .array()
availability.



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