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From "Carl Steinbach (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1364) Increase the maximum length of SERDEPROPERTIES values (currently 767 characters)
Date Mon, 24 May 2010 18:14:24 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870752#action_12870752
] 

Carl Steinbach commented on HIVE-1364:
--------------------------------------

The max length of a VARCHAR in Oracle (9i/10g/11g) is 4000 bytes, so
I suppose it makes sense to use 4000 as the default size for string properties
that we don't need to index.

> Increase the maximum length of SERDEPROPERTIES values (currently 767 characters)
> --------------------------------------------------------------------------------
>
>                 Key: HIVE-1364
>                 URL: https://issues.apache.org/jira/browse/HIVE-1364
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Metastore
>    Affects Versions: 0.5.0
>            Reporter: Carl Steinbach
>
> The value component of a SERDEPROPERTIES key/value pair is currently limited
> to a maximum length of 767 characters. I believe that the motivation for limiting the
length to 
> 767 characters is that this value is the maximum allowed length of an index in
> a MySQL database running on the InnoDB engine: http://bugs.mysql.com/bug.php?id=13315
> * The Metastore OR mapping currently limits many fields (including SERDEPROPERTIES.PARAM_VALUE)
to a maximum length of 767 characters despite the fact that these fields are not indexed.
> * The maximum length of a VARCHAR value in MySQL 5.0.3 and later is 65,535.
> * We can expect many users to hit the 767 character limit on SERDEPROPERTIES.PARAM_VALUE
when using the hbase.columns.mapping serdeproperty to map a table that has many columns.
> I propose increasing the maximum allowed length of SERDEPROPERTIES.PARAM_VALUE to 8192.

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