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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1426) Change the size of Tuple from Int to VInt when Serialize Tuple
Date Mon, 24 May 2010 23:02:24 GMT

    [ https://issues.apache.org/jira/browse/PIG-1426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870899#action_12870899
] 

Alan Gates commented on PIG-1426:
---------------------------------

This looks cool.  Eventually we could extend it to length of strings, bags, databyte arrays,
etc.  

One question.  Zebra and BinStorage use the code in DataReaderWriter to read this data off
disk.  Is WritableUtils.readVInt compatible with a regular integer as well?  If not, it seems
we're introducing a data incompatibility for data stored using these formats.

> Change the size of Tuple from Int to VInt when Serialize Tuple
> --------------------------------------------------------------
>
>                 Key: PIG-1426
>                 URL: https://issues.apache.org/jira/browse/PIG-1426
>             Project: Pig
>          Issue Type: Improvement
>          Components: data
>    Affects Versions: 0.8.0
>            Reporter: Jeff Zhang
>            Assignee: Jeff Zhang
>             Fix For: 0.8.0
>
>         Attachments: PIG_1426.patch
>
>
> Most of  time,  the size of tuple is not very large, one byte is enough for store the
size of tuple. So I suggest to use VInt instead of Int for the size of tuple when doing Serialization.
Because the key type of map output is Tuple, so this can reduce the amount of data transferred
from mapper to reducer. 

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