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https://issues.apache.org/jira/browse/HADOOP-120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527245
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Cameron Pope commented on HADOOP-120:
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Yes, that's definitely a better fix and if anyone is using ArrayWritable's
default constructor, it sould be easy to change.
> Reading an ArrayWriter does not work because valueClass does not get
> initialized
> --------------------------------------------------------------------------------
>
> Key: HADOOP-120
> URL: https://issues.apache.org/jira/browse/HADOOP-120
> Project: Hadoop
> Issue Type: Bug
> Components: io
> Affects Versions: 0.15.0
> Environment: Red Hat
> Reporter: Dick King
> Assignee: Doug Cutting
> Attachments: HADOOP-120-3.patch, hadoop-120-fix.patch,
> hadoop-120-workaround.patch
>
>
> If you have a Reducer whose value type is an ArrayWriter it gets enstreamed
> alright but at reconstruction type when ArrayWriter::readFields(DataInput in)
> runs on a DataInput that has a nonempty ArrayWriter , newInstance fails
> trying to instantiate the null class.
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