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https://issues.apache.org/jira/browse/HADOOP-5142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doğacan Güney updated HADOOP-5142:
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    Attachment: mapwritableputall.patch

Simple patch that just calls put method.

I haven't tested this patch but I think it should work.

> MapWritable#putAll does not store classes
> -----------------------------------------
>
>                 Key: HADOOP-5142
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5142
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: io
>            Reporter: Doğacan Güney
>            Priority: Minor
>         Attachments: mapwritableputall.patch
>
>
> MapWritable's putAll method does not call addToMap for keys and values as 
> MapWritable#put does. So new classes will not be stored
> in class-id maps and will lead to problems during readFields.

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