Can you say more about what you are trying to do? Also, which version of Mahout?
Is this for production optimization? Or for self-education? On Mon, Apr 18, 2011 at 3:01 PM, Wojciech Indyk <[email protected]>wrote: > evolutionary algorithm output problem description: > While evolutionaryAlgorithm example is running I receive IOException after > first iteration: > IOException > java.lang.IllegalStateException: Exception while evaluating the population > at > > org.apache.mahout.ga.watchmaker.MahoutFitnessEvaluator.evaluate(MahoutFitnessEvaluator.java:40) > at > > org.apache.mahout.ga.watchmaker.STFitnessEvaluator.getFitness(STFitnessEvaluator.java:39) > at > > org.uncommons.watchmaker.framework.SequentialEvolutionEngine.evaluatePopulation(SequentialEvolutionEngine.java:105) > at > > org.uncommons.watchmaker.framework.AbstractEvolutionEngine.evolvePopulation(AbstractEvolutionEngine.java:234) > at > > org.uncommons.watchmaker.framework.AbstractEvolutionEngine.evolve(AbstractEvolutionEngine.java:125) > at > > org.uncommons.watchmaker.framework.AbstractEvolutionEngine.evolve(AbstractEvolutionEngine.java:103) > at > > org.apache.mahout.ga.watchmaker.travellingsalesman.EvolutionaryTravellingSalesman.calculateShortestRoute(EvolutionaryTravellingSalesman.java:156) > at > > org.apache.mahout.ga.watchmaker.travellingsalesman.ConsoleTravellingSalesman$TSSwingBackgroundTask.performTask(ConsoleTravellingSalesman.java:99) > at > > org.apache.mahout.ga.watchmaker.travellingsalesman.ConsoleTravellingSalesman$TSSwingBackgroundTask.performTask(ConsoleTravellingSalesman.java:81) > at > org.uncommons.swing.SwingBackgroundTask$1.run(SwingBackgroundTask.java:63) > at java.lang.Thread.run(Thread.java:662) > Caused by: java.io.EOFException > at java.io.DataInputStream.readFully(DataInputStream.java:180) > at java.io.DataInputStream.readFully(DataInputStream.java:152) > at > org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1465) > at > org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1437) > at > org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1360) > at > > org.apache.hadoop.io.SequenceFile$Sorter$SegmentDescriptor.nextRawKey(SequenceFile.java:3087) > at > > org.apache.hadoop.io.SequenceFile$Sorter$MergeQueue.merge(SequenceFile.java:2902) > at > org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.java:2631) > at > org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.java:2602) > at > org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.java:2716) > at > > org.apache.mahout.ga.watchmaker.OutputUtils.importEvaluations(OutputUtils.java:87) > at > > org.apache.mahout.ga.watchmaker.MahoutEvaluator.evaluate(MahoutEvaluator.java:73) > at > > org.apache.mahout.ga.watchmaker.MahoutFitnessEvaluator.evaluate(MahoutFitnessEvaluator.java:37) > ... 10 more > I (probably) find a bug (if it’s bug) and solve it through delete output > folder before every iteration. > ( > https://github.com/windDanie/mahout/commit/7c6eba874ea618c0c6a93e71bbe3e7734d5c7367 > < > https://docs.google.com/document/d/1oD1nUKpBu5qHWbbc98tJgfAJvUEp1nNLRENuQL9-26M/(https://github.com/windDanie/mahout/commit/7c6eba874ea618c0c6a93e71bbe3e7734d5c7367 > >). > I found place, where output folder existence is checked and throwed > FileAlreadyExistsException (in hadoopCore: FileOutputFormat, line 122). > What do You think about it? >
