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From "Vinicius Maciel Sant' Ana (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10898) MapWritable instances cannot be reused when containing different custom Writable classes.
Date Thu, 03 Nov 2016 19:20:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15633919#comment-15633919
] 

Vinicius Maciel Sant' Ana commented on HADOOP-10898:
----------------------------------------------------

Hey there, Eli Acherkan.
Your issue is a duplicate from https://issues.apache.org/jira/browse/HADOOP-9295
The author there had the same problem and proposed a similar solution, maybe you can help
there.

> MapWritable instances cannot be reused when containing different custom Writable classes.
> -----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-10898
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10898
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>            Reporter: Eli Acherkan
>            Priority: Minor
>         Attachments: HADOOP-10898.patch
>
>
> When a data stream contains several MapWritable instances, which contain instances of
several different custom classes (implementing Writable), attempting to reuse a single MapWritable
instance for reading the data stream results in an IllegalArgumentException. This happens
because AbstractMapWritable.readFields doesn't reset the classToIdMap/idToClassMap data structures.



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