[jira] [Assigned] (IMPALA-8549) Add support for scanning DEFLATE text files

["Bikramjeet Vig (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-8549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bikramjeet Vig reassigned IMPALA-8549:
--------------------------------------

    Assignee: Ethan

> Add support for scanning DEFLATE text files
> -------------------------------------------
>
>                 Key: IMPALA-8549
>                 URL: https://issues.apache.org/jira/browse/IMPALA-8549
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: Sahil Takiar
>            Assignee: Ethan
>            Priority: Minor
>              Labels: ramp-up
>
> Several Hadoop tools (e.g. Hive, MapReduce, etc.) support reading and writing text files stored using zlib / deflate (results in files such as {{000000_0.deflate}}). Impala currently does not support reading {{.deflate}} files and returns errors such as: {{ERROR: Scanner plugin 'DEFLATE' is not one of the enabled plugins: 'LZO'}}.
> Moreover, the default compression codec in Hadoop is zlib / deflate (see {{o.a.h.io.compress.DefaultCodec}}). So when writing to a text table in Hive, if users set {{hive.exec.compress.output}} to true, then {{.deflate}} files will be written by default.
> Impala does support zlib / deflate with other file formats though: Avro, RCFiles, SequenceFiles (see https://impala.apache.org/docs/build/html/topics/impala_file_formats.html).



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