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Date: Mon, 25 Mar 2013 16:49:17 +0000 (UTC)
From: "Gang Tim Liu (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12629755.1359487556397.49427.1364230157348@arcas>
In-Reply-To: <JIRA.12629755.1359487556397@arcas>
References: <JIRA.12629755.1359487556397@arcas>
Subject: [jira] [Work started] (HIVE-3958) support partial scan for analyze
 command - RCFile
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     [ https://issues.apache.org/jira/browse/HIVE-3958?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-3958 started by Gang Tim Liu.

> support partial scan for analyze command - RCFile
> -------------------------------------------------
>
>                 Key: HIVE-3958
>                 URL: https://issues.apache.org/jira/browse/HIVE-3958
>             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 https://cwiki.apache.org/Hive/rcfilecat.html 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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