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POHadoop pipes problem
 

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    <p>I have configured hadoop in pseudo-distributed mode (single -node cluster) on my ubuntu 10.04.</p> <p>I have a problem in running hadoop pipes code my code is following:</p> <pre><code>#include "/home/hadoop/project/hadoop-0.20.2/c++/Linux-amd64-64/include/hadoop/Pipes.hh" #include "/home/hadoop/project/hadoop-0.20.2/c++/Linux-amd64-64/include/hadoop/TemplateFactory.hh" #include "/home/hadoop/project/hadoop-0.20.2/c++/Linux-amd64-64/include/hadoop/StringUtils.hh" #include "/home/hadoop/project/hadoop-0.20.2/src/c++/libhdfs/hdfs.h" const std::string WORDCOUNT = "WORDCOUNT"; const std::string INPUT_WORDS = "INPUT_WORDS"; const std::string OUTPUT_WORDS = "OUTPUT_WORDS"; //hdfs fs; //hdfs writefile; hdfsFS fs; hdfsFile writefile; const char* writepath="/temp/mest"; class WordCountMap: public HadoopPipes::Mapper { public: HadoopPipes::TaskContext::Counter* inputWords; WordCountMap(HadoopPipes::TaskContext&amp; context) { fs = hdfsConnect("192.168.0.133", 54310); inputWords = context.getCounter(WORDCOUNT, INPUT_WORDS); } ~WordCountMap() { hdfsCloseFile(fs, writefile); } void map(HadoopPipes::MapContext&amp; context) { hdfsFile writefile = hdfsOpenFile(fs, writepath, O_WRONLY|O_CREAT, 0, 0, 0); std::vector&lt;std::string&gt; words = HadoopUtils::splitString(context.getInputValue(), " "); for(unsigned int i=0; i &lt; words.size(); ++i) { context.emit(words[i], "1"); } context.incrementCounter(inputWords, words.size()); } }; class WordCountReduce: public HadoopPipes::Reducer { public: HadoopPipes::TaskContext::Counter* outputWords; WordCountReduce(HadoopPipes::TaskContext&amp; context) { outputWords = context.getCounter(WORDCOUNT, OUTPUT_WORDS); } void reduce(HadoopPipes::ReduceContext&amp; context) { int sum = 0; while (context.nextValue()) { sum += HadoopUtils::toInt(context.getInputValue()); } context.emit(context.getInputKey(), HadoopUtils::toString(sum)); context.incrementCounter(outputWords, 1); } }; int main(int argc, char *argv[]) { return HadoopPipes::runTask(HadoopPipes::TemplateFactory&lt;WordCountMap, WordCountReduce&gt;()); } </code></pre> <p>I compiled it it compiled successfully.</p> <p>I run it with following command:</p> <blockquote> <p>bin/hadoop pipes -D java.pipes.recordreader=true -D java.pipes.recordwriter=true -input gutenberg -output manish_gut2 -program bin/cat</p> </blockquote> <p>but when i run it it shows following problems:</p> <pre><code>11/05/04 16:13:12 WARN mapred.JobClient: No job jar file set. User classes may not be found. See JobConf(Class) or JobConf#setJar(String). 11/05/04 16:13:12 INFO mapred.FileInputFormat: Total input paths to process : 3 11/05/04 16:13:13 INFO mapred.JobClient: Running job: job_201105041611_0001 11/05/04 16:13:14 INFO mapred.JobClient: map 0% reduce 0% 11/05/04 16:13:24 INFO mapred.JobClient: Task Id : attempt_201105041611_0001_m_000000_0, Status : FAILED java.io.IOException: pipe child exception at org.apache.hadoop.mapred.pipes.Application.abort(Application.java:151) at org.apache.hadoop.mapred.pipes.PipesMapRunner.run(PipesMapRunner.java:101) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) at org.apache.hadoop.mapred.Child.main(Child.java:170) Caused by: java.io.EOFException at java.io.DataInputStream.readByte(DataInputStream.java:250) at org.apache.hadoop.io.WritableUtils.readVLong(WritableUtils.java:298) at org.apache.hadoop.io.WritableUtils.readVInt(WritableUtils.java:319) at org.apache.hadoop.mapred.pipes.BinaryProtocol$UplinkReaderThread.run(BinaryProtocol.java:114) attempt_201105041611_0001_m_000000_0: Hadoop Pipes Exception: RecordReader not defined at /export/crawlspace/chris/work/branch-0.20/src/c++/pipes/impl/HadoopPipes.cc:692 in virtual void HadoopPipes::TaskContextImpl::runMap(std::string, int, bool) 11/05/04 16:13:24 INFO mapred.JobClient: Task Id : attempt_201105041611_0001_m_000001_0, Status : FAILED java.io.IOException: pipe child exception at org.apache.hadoop.mapred.pipes.Application.abort(Application.java:151) at org.apache.hadoop.mapred.pipes.PipesMapRunner.run(PipesMapRunner.java:101) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) at org.apache.hadoop.mapred.Child.main(Child.java:170) Caused by: java.io.EOFException at java.io.DataInputStream.readByte(DataInputStream.java:250) at org.apache.hadoop.io.WritableUtils.readVLong(WritableUtils.java:298) at org.apache.hadoop.io.WritableUtils.readVInt(WritableUtils.java:319) at org.apache.hadoop.mapred.pipes.BinaryProtocol$UplinkReaderThread.run(BinaryProtocol.java:114) attempt_201105041611_0001_m_000001_0: Hadoop Pipes Exception: RecordReader not defined at /export/crawlspace/chris/work/branch-0.20/src/c++/pipes/impl/HadoopPipes.cc:692 in virtual void HadoopPipes::TaskContextImpl::runMap(std::string, int, bool) 11/05/04 16:13:29 INFO mapred.JobClient: Task Id : attempt_201105041611_0001_m_000001_1, Status : FAILED java.io.IOException: pipe child exception at org.apache.hadoop.mapred.pipes.Application.abort(Application.java:151) at org.apache.hadoop.mapred.pipes.PipesMapRunner.run(PipesMapRunner.java:101) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) at org.apache.hadoop.mapred.Child.main(Child.java:170) Caused by: java.io.EOFException at java.io.DataInputStream.readByte(DataInputStream.java:250) at org.apache.hadoop.io.WritableUtils.readVLong(WritableUtils.java:298) at org.apache.hadoop.io.WritableUtils.readVInt(WritableUtils.java:319) at org.apache.hadoop.mapred.pipes.BinaryProtocol$UplinkReaderThread.run(BinaryProtocol.java:114) attempt_201105041611_0001_m_000001_1: Hadoop Pipes Exception: RecordReader not defined at /export/crawlspace/chris/work/branch-0.20/src/c++/pipes/impl/HadoopPipes.cc:692 in virtual void HadoopPipes::TaskContextImpl::runMap(std::string, int, bool) 11/05/04 16:13:29 INFO mapred.JobClient: Task Id : attempt_201105041611_0001_m_000000_1, Status : FAILED java.io.IOException: pipe child exception at org.apache.hadoop.mapred.pipes.Application.abort(Application.java:151) at org.apache.hadoop.mapred.pipes.PipesMapRunner.run(PipesMapRunner.java:101) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) at org.apache.hadoop.mapred.Child.main(Child.java:170) Caused by: java.io.EOFException at java.io.DataInputStream.readByte(DataInputStream.java:250) at org.apache.hadoop.io.WritableUtils.readVLong(WritableUtils.java:298) at org.apache.hadoop.io.WritableUtils.readVInt(WritableUtils.java:319) at org.apache.hadoop.mapred.pipes.BinaryProtocol$UplinkReaderThread.run(BinaryProtocol.java:114) attempt_201105041611_0001_m_000000_1: Hadoop Pipes Exception: RecordReader not defined at /export/crawlspace/chris/work/branch-0.20/src/c++/pipes/impl/HadoopPipes.cc:692 in virtual void HadoopPipes::TaskContextImpl::runMap(std::string, int, bool) 11/05/04 16:13:35 INFO mapred.JobClient: Task Id : attempt_201105041611_0001_m_000000_2, Status : FAILED java.io.IOException: pipe child exception at org.apache.hadoop.mapred.pipes.Application.abort(Application.java:151) at org.apache.hadoop.mapred.pipes.PipesMapRunner.run(PipesMapRunner.java:101) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) at org.apache.hadoop.mapred.Child.main(Child.java:170) Caused by: java.io.EOFException at java.io.DataInputStream.readByte(DataInputStream.java:250) at org.apache.hadoop.io.WritableUtils.readVLong(WritableUtils.java:298) at org.apache.hadoop.io.WritableUtils.readVInt(WritableUtils.java:319) at org.apache.hadoop.mapred.pipes.BinaryProtocol$UplinkReaderThread.run(BinaryProtocol.java:114) attempt_201105041611_0001_m_000000_2: Hadoop Pipes Exception: RecordReader not defined at /export/crawlspace/chris/work/branch-0.20/src/c++/pipes/impl/HadoopPipes.cc:692 in virtual void HadoopPipes::TaskContextImpl::runMap(std::string, int, bool) 11/05/04 16:13:35 INFO mapred.JobClient: Task Id : attempt_201105041611_0001_m_000001_2, Status : FAILED java.io.IOException: pipe child exception at org.apache.hadoop.mapred.pipes.Application.abort(Application.java:151) at org.apache.hadoop.mapred.pipes.PipesMapRunner.run(PipesMapRunner.java:101) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) at org.apache.hadoop.mapred.Child.main(Child.java:170) Caused by: java.io.EOFException at java.io.DataInputStream.readByte(DataInputStream.java:250) at org.apache.hadoop.io.WritableUtils.readVLong(WritableUtils.java:298) at org.apache.hadoop.io.WritableUtils.readVInt(WritableUtils.java:319) at org.apache.hadoop.mapred.pipes.BinaryProtocol$UplinkReaderThread.run(BinaryProtocol.java:114) attempt_201105041611_0001_m_000001_2: Hadoop Pipes Exception: RecordReader not defined at /export/crawlspace/chris/work/branch-0.20/src/c++/pipes/impl/HadoopPipes.cc:692 in virtual void HadoopPipes::TaskContextImpl::runMap(std::string, int, bool) 11/05/04 16:13:44 INFO mapred.JobClient: Job complete: job_201105041611_0001 11/05/04 16:13:44 INFO mapred.JobClient: Counters: 3 11/05/04 16:13:44 INFO mapred.JobClient: Job Counters 11/05/04 16:13:44 INFO mapred.JobClient: Launched map tasks=8 11/05/04 16:13:44 INFO mapred.JobClient: Data-local map tasks=8 11/05/04 16:13:44 INFO mapred.JobClient: Failed map tasks=1 Exception in thread "main" java.io.IOException: Job failed! at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1252) at org.apache.hadoop.mapred.pipes.Submitter.runJob(Submitter.java:248) at org.apache.hadoop.mapred.pipes.Submitter.run(Submitter.java:479) at org.apache.hadoop.mapred.pipes.Submitter.main(Submitter.java:494) </code></pre> <p>I dont know what i'm doing wrong ? how can i run this program ? how to resolve these error?</p>
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