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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3414) Facility to query serializable types such as Writables for 'raw length'
Date Mon, 19 May 2008 23:40:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12598134#action_12598134
] 

Arun C Murthy commented on HADOOP-3414:
---------------------------------------

This would be useful even without LengthPrefixedSerializer, since typically we want to write
out both record/key/value lengths first, before the actual data ala SequenceFiles. 

Serializer#getSize in itself goes a long way! *smile*

> Facility to query serializable types such as Writables for 'raw length'
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-3414
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3414
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: io
>            Reporter: Arun C Murthy
>
> Currently we need to jump through hoops to get the 'raw length' of serializable types
for e.g. SequenceFile.Writer.append needs to copy the key/value into a buffer and then check
the buffer's size to figure the record/key/value lenghts. Obviously this can be improved to
do away with the extra copy if we had types which could be queried for it's raw-length.
> Thoughts?

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