Github user ellisonanne commented on the issue:
https://github.com/apache/incubator-pirk/pull/18
`fs` is defined in setup of `ExpTableMapper`:
```
public void setup(Context ctx) throws IOException, InterruptedException
{
super.setup(ctx);
valueOut = new Text();
FileSystem fs = FileSystem.newInstance(ctx.getConfiguration());
String queryDir = ctx.getConfiguration().get("pirMR.queryInputDir");
query = Query.readFromHDFSFile(new Path(queryDir), fs);
dataPartitionBitSize = query.getQueryInfo().getDataPartitionBitSize();
maxValue = (int) Math.pow(2, dataPartitionBitSize) - 1;
NSquared = query.getNSquared();
}
```
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