Jan van der Lugt created GIRAPH-216:
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Summary: 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
Attachments: GIRAPH-216.patch
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/%[email protected]%3E
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