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From "Anuj Ojha (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-232) DoFn initialize method gets called twice where as cleanup gets called only once when join is performed on two PTables.
Date Tue, 02 Jul 2013 21:39:20 GMT
Anuj Ojha created CRUNCH-232:
--------------------------------

             Summary: DoFn initialize method gets called twice where as cleanup gets called
only once when join is performed on two PTables.
                 Key: CRUNCH-232
                 URL: https://issues.apache.org/jira/browse/CRUNCH-232
             Project: Crunch
          Issue Type: Bug
          Components: MapReduce Patterns
    Affects Versions: 0.6.0
            Reporter: Anuj Ojha
            Priority: Critical


DoFn's initialize method gets called twice where as cleanup gets called only once, when a
Join is performed on two Ptables.
 
Sample Test:
{code} 
        final Configuration config = HBaseTest.getConf();
        final Pipeline pipeline = new MRPipeline(MaraCheckTest.class, config);
        final PCollection<String> collectionHelper1 = pipeline.readTextFile(HBaseTest.class.getResource(
                "/HbaseTestFile.txt").toString());
 
        final PCollection<String> collectionHelper2 = pipeline.readTextFile(HBaseTest.class.getResource(
                "/HbaseTestFile2.txt").toString());
 
        final PTable<Integer, String> ptable1 = collectionHelper2.parallelDo("Creating
table", new DoFnCheck(),
                Avros.tableOf(Avros.ints(), Avros.strings()));
 
        final PTable<Integer, String> ptable2 = collectionHelper1.parallelDo("Creating
table2", new DoFnCheck2(),
                Avros.tableOf(Avros.ints(), Avros.strings()));
 
        final PTable<Integer, Pair<String, String>> joinedTable = ptable1.join(ptable2);
 
        final PCollection<String> joinedStrings = joinedTable.parallelDo(
                new MapFn<Pair<Integer, Pair<String, String>>, String>()
{
                    private static final long serialVersionUID = -8796426750247480646L;
 
                    @Override
                    public String map(final Pair<Integer, Pair<String, String>>
input) {
                        return input.second().first() + "/" + input.second().second();
                    }
                }, Avros.strings());
 
        System.out.println(joinedStrings.materialize().iterator().hasNext());
 {code}
 
The two DoFnCheck looks something like this:
 
{code} 
public class DoFnCheck extends DoFn<String, Pair<Integer, String>> {
    /**
     * 
     */
    private static final long serialVersionUID = 6780749658216132026L;
 
    @Override
    public void initialize() {
        System.out
                .println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!I'm initializing!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
    }
 
    @Override
    public void cleanup(final Emitter<Pair<Integer, String>> emitter) {
        System.out
                .println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!I'm cleaned up!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
    }
 
    @Override
    public void process(final String input, final Emitter<Pair<Integer, String>>
emitter) {
        // TODO Auto-generated method stub
        System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Process!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 
        final Pair<Integer, String> pair = new Pair<Integer, String>(1, input);
 
        emitter.emit(pair);
    }
}
{code} 
 
The console looks like this:
 
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!I'm initializing!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Process!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!I'm cleaned up!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!I'm initializing!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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