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From "Gianmarco De Francisci Morales (JIRA)" <>
Subject [jira] [Updated] (GIRAPH-235) SequenceFile output format (id-value only)
Date Wed, 04 Jul 2012 16:08:33 GMT


Gianmarco De Francisci Morales updated GIRAPH-235:

    Attachment: GIRAPH-235.1.patch

I have an initial patch for this, but I encountered some problems which I was not able to
figure out. Namely, I get this exception when I try to use this class with GiraphRunner:

java.lang.IllegalStateException: run: Caught an unrecoverable exception wrong value class: is not class
	at org.apache.hadoop.mapred.MapTask.runNewMapper(
	at org.apache.hadoop.mapred.Child$
	at Method)
	at org.apache.hadoop.mapred.Child.main(
Caused by: wrong value class: is
not class
	at org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat$1.write(
	at org.apache.giraph.examples.VertexIDValueBinOutputFormat$VertexIdValueWriter.writeVertex(
	at org.apache.giraph.graph.BspServiceWorker.saveVertices(
	at org.apache.giraph.graph.BspServiceWorker.cleanup(
	at org.apache.giraph.graph.GraphMapper.cleanup(

My vertex is a RandomWalkWithRestartVertex which extends (via 2 indirect levels of inheritance)
MutableVertex<LongWritable, DoubleWritable, FloatWritable, DoubleWritable>

I guess I am misconfiguring something.
> SequenceFile output format (id-value only)
> ------------------------------------------
>                 Key: GIRAPH-235
>                 URL:
>             Project: Giraph
>          Issue Type: New Feature
>          Components: lib
>            Reporter: Gianmarco De Francisci Morales
>         Attachments: GIRAPH-235.1.patch
> Create a SequenceFileOutputFormat for the cases where compression is important and we
only want the value of the vertex (e.g. pagerank)

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