Yes, if they are Writable and are part of your vertex message or value type. You may want to have a look at MapWritable or other serializable collections in the org.apache.hadoop.io package.
2012/11/29 lee fei <[email protected]> > Hi, > > I am a newbie to hama,Can Aggregator in graph package store an Arraylist > or a HashMap for some special usages? > > Thank you for you attention~ >
