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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3601) Hive as a contrib project
Date Tue, 01 Jul 2008 16:40:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12609634#action_12609634
] 

Owen O'Malley commented on HADOOP-3601:
---------------------------------------

We commit new features into trunk and branch the release from the trunk on the feature freeze
day. Only bug fixes are down ported to the release branches, not new features. The soonest
that Hive could be in a release would be 0.19.

It does not have to be complete to be checked in, but it does need to compile and pass any
unit tests that it defines. It would be fine to make this jira the initial check in and have
follow up ones that make it usable.

> Hive as a contrib project
> -------------------------
>
>                 Key: HADOOP-3601
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3601
>             Project: Hadoop Core
>          Issue Type: New Feature
>    Affects Versions: 0.17.0
>            Reporter: Joydeep Sen Sarma
>            Priority: Minor
>   Original Estimate: 1080h
>  Remaining Estimate: 1080h
>
> Hive is a data warehouse built on top of flat files (stored primarily in HDFS). It includes:
> - Data Organization into Tables with logical and hash partitioning
> - A Metastore to store metadata about Tables/Partitions etc
> - A SQL like query language over object data stored in Tables
> - DDL commands to define and load external data into tables
> Hive's query language is executed using Hadoop map-reduce as the execution engine. Queries
can use either single stage or multi-stage map-reduce. Hive has a native format for tables
- but can handle any data set (for example json/thrift/xml) using an IO library framework.
> Hive uses Antlr for query parsing, Apache JEXL for expression evaluation and may use
Apache Derby as an embedded database for MetaStore. Antlr has a BSD license and should be
compatible with Apache license.
> We are currently thinking of contributing to the 0.17 branch as a contrib project (since
that is the version under which it will get tested internally) - but looking for advice on
the best release path.

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