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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (GIRAPH-216) NullWritable as VertexData, EdgeData or MessageData should be allowed
Date Thu, 05 Jul 2012 18:50:35 GMT

     [ https://issues.apache.org/jira/browse/GIRAPH-216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jakob Homan updated GIRAPH-216:
-------------------------------

    Attachment: GIRAPH-216-3.patch

Latest patch had an extra 's' tag along and thus won't compile.
                
> NullWritable as VertexData, EdgeData or MessageData should be allowed
> ---------------------------------------------------------------------
>
>                 Key: GIRAPH-216
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-216
>             Project: Giraph
>          Issue Type: Bug
>            Reporter: Jan van der Lugt
>            Assignee: Jan van der Lugt
>         Attachments: GIRAPH-216-3.patch, GIRAPH-216.patch, GIRAPH-216.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> When using NullWritable as VertexData, EdgeData or MessageData, an error occurs. This
happens because the constructor of NullWritable is private, so ReflectionUtils.newInstance()
fails. The solution is checking for NullWritable separately, and then returning NullWritable.get()
instead of a new class. This can save very large amounts of memory, since NullWritable is
a singleton.
> This was reported on the mailing list, but never fixed: http://mail-archives.apache.org/mod_mbox/incubator-giraph-user/201112.mbox/%3C4EDED788.4020904@apache.org%3E

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