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: https://issues.apache.org/jira/browse/GIRAPH-216 ? 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
