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Posted to common-issues@hadoop.apache.org by "Eli Collins (JIRA)" <ji...@apache.org> on 2012/07/10 21:10:34 UTC

[jira] [Assigned] (HADOOP-8522) ResetableGzipOutputStream creates invalid gzip files when finish() and resetState() are used

     [ https://issues.apache.org/jira/browse/HADOOP-8522?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins reassigned HADOOP-8522:
-----------------------------------

    Assignee: Mike Percy

Hey Mike, any update?
                
> ResetableGzipOutputStream creates invalid gzip files when finish() and resetState() are used
> --------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8522
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8522
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 1.0.3, 2.0.0-alpha
>            Reporter: Mike Percy
>            Assignee: Mike Percy
>         Attachments: HADOOP-8522-2a.patch
>
>
> ResetableGzipOutputStream creates invalid gzip files when finish() and resetState() are used. The issue is that finish() flushes the compressor buffer and writes the gzip CRC32 + data length trailer. After that, resetState() does not repeat the gzip header, but simply starts writing more deflate-compressed data. The resultant files are not readable by the Linux "gunzip" tool. ResetableGzipOutputStream should write valid multi-member gzip files.
> The gzip format is specified in [RFC 1952|https://tools.ietf.org/html/rfc1952].

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