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From "Gang Tim Liu (JIRA)" <>
Subject [jira] [Updated] (HIVE-3958) support partial scan for analyze command - RCFile
Date Mon, 25 Mar 2013 16:49:17 GMT


Gang Tim Liu updated HIVE-3958:

    Attachment: HIVE-3958.patch.4
> support partial scan for analyze command - RCFile
> -------------------------------------------------
>                 Key: HIVE-3958
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Gang Tim Liu
>            Assignee: Gang Tim Liu
>         Attachments: HIVE-3958.patch.1, HIVE-3958.patch.2, HIVE-3958.patch.3, HIVE-3958.patch.4
> analyze commands allows us to collect statistics on existing tables/partitions. It works
great but might be slow since it scans all files.
> There are 2 ways to speed it up:
> 1. collect stats without file scan. It may not collect all stats but good and fast enough
for use case. HIVE-3917 addresses it
> 2. collect stats via partial file scan. It doesn't scan all content of files but part
of it to get file metadata. some examples are
for RCFile, ORC ( HIVE-3874 ) and HFile of Hbase
> This jira is targeted to address the #2. More specifically RCFile format.

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