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From Jan van der Lugt <>
Subject NullWritable as VertexData, EdgeData or MessageData
Date Thu, 28 Jun 2012 00:00:27 GMT
Hi all,

Right now it is not possible to use NullWritable as VertexData, EdgeData or
MessageData. I made a small patch to enable this, since it can save a lot
of memory (especially in the case of EdgeData). Could someone take a look
at this JIRA: ? There are
only a few lines of added code in the patch, which catches the NullWritable
type and returns the singleton NullWritable instead of instantiating a new
NullWritable (which is not possible). Thanks!

- Jan

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