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From "Jeff Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1426) Change the size of Tuple from Int to VInt when Serialize Tuple
Date Fri, 28 May 2010 01:26:37 GMT

    [ https://issues.apache.org/jira/browse/PIG-1426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12872753#action_12872753

Jeff Zhang commented on PIG-1426:

Alan, but when writing we use the VInt, so it won't affect the reading. One problem I can
think of is the incompatibility with previous Tuple Implementation using Int. The VInt version
Tuple can not read the data written using Int.

> 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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