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Date: Thu, 10 Dec 2009 19:06:18 +0000 (UTC)
From: "Aaron Kimball (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6323) Serialization should provide
 comparators
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    [ https://issues.apache.org/jira/browse/HADOOP-6323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12788847#action_12788847 ] 

Aaron Kimball commented on HADOOP-6323:
---------------------------------------

With Writable serialization, yes, you've always had to pre-declare the datatypes for each of the four key/value types emitted during a job dataflow. (The input types were implicit from the InputFormat/RecordReader.)

I don't think it's necessary to dynamically determine the schema for emitted data during jobs in Avro either. I think if it were, someone would have already asked for some sort of "DelayedWritable" notion to be integrated in MapReduce already -- which I don't think we've seen. It might be nice to support this eventually, but let's wait for demand.


> Serialization should provide comparators
> ----------------------------------------
>
>                 Key: HADOOP-6323
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6323
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: io
>            Reporter: Doug Cutting
>            Assignee: Aaron Kimball
>         Attachments: HADOOP-6323.2.patch, HADOOP-6323.3.patch, HADOOP-6323.4.patch, HADOOP-6323.5.patch, HADOOP-6323.6.patch, HADOOP-6323.patch
>
>
> The Serialization interface should permit one to create raw comparators.

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