Apache Hadoop MapReduce Core errors

https://hadoop.apache.org/docs/r1.2.1/mapred_tutorial.html

A software framework for easily writing applications which process vast amounts of data in-parallel on large clusters of commodity hardware in a reliable, fault-tolerant manner

Documented:

DescriptionException TypeEntry MethodWeb pages
IOExceptionJobClient$2.run6
IOExceptionJobClient$2.run1
Package nameClass namePatterns foundSolution coverageDescription coverage
org.apache.hadoop.mapredMapTask166
org.apache.hadoop.mapredJobClient97
org.apache.hadoop.mapredReduceTask35
org.apache.hadoop.mapredFileInputFormat30
org.apache.hadoop.mapredJobTracker29
org.apache.hadoop.mapredMapTask$MapOutputBuffer28
org.apache.hadoop.mapredJobConf26
org.apache.hadoop.mapredMapRunner11
org.apache.hadoop.mapredLineRecordReader7
org.apache.hadoop.mapredTextInputFormat6
org.apache.hadoop.mapredMapTask$NewOutputCollector6
org.apache.hadoop.mapredJobClient$26
org.apache.hadoop.mapredMapTask$NewDirectOutputCollector6
org.apache.hadoop.mapredMapTask$MapOutputBuffer$Buffer5
org.apache.hadoop.mapredMapTask$NewTrackingRecordReader5
org.apache.hadoop.mapredJobInProgress4
org.apache.hadoop.mapredTask4
org.apache.hadoop.mapredMapTask$OldOutputCollector4
org.apache.hadoop.mapredFileOutputFormat3
org.apache.hadoop.mapredSequenceFileInputFormat3
org.apache.hadoop.mapredMapTask$MapOutputBuffer$SpillThread3
org.apache.hadoop.mapredTextOutputFormat3
org.apache.hadoop.mapredMapTask$TrackedRecordReader3
org.apache.hadoop.mapredTaskStatus2
org.apache.hadoop.mapredFileOutputCommitter2
org.apache.hadoop.mapredReduceTask$NewTrackingRecordWriter2
org.apache.hadoop.mapredMerger2
org.apache.hadoop.mapredSequenceFileRecordReader2
org.apache.hadoop.mapredTask$CombinerRunner1
org.apache.hadoop.mapredMapFileOutputFormat1
org.apache.hadoop.mapredTaskLog1
org.apache.hadoop.mapredSpillRecord1
org.apache.hadoop.mapredOutputCommitter1
org.apache.hadoop.mapredTask$NewCombinerRunner$OutputConverter1
org.apache.hadoop.mapredSequenceFileOutputFormat1
org.apache.hadoop.mapredIFileOutputStream1
org.apache.hadoop.mapredReduceTask$OldTrackingRecordWriter1
org.apache.hadoop.mapredJobClient$11
org.apache.hadoop.mapredMerger$Segment1
org.apache.hadoop.mapredJobClient$NetworkedJob1
org.apache.hadoop.mapredTask$ValuesIterator1
org.apache.hadoop.mapredReduceTask$31
org.apache.hadoop.mapredTaskAttemptID1
org.apache.hadoop.mapredIFile$Writer1
org.apache.hadoop.mapredCounters1
org.apache.hadoop.mapredTask$CombineOutputCollector1
org.apache.hadoop.mapredMapOutputFile1
Package nameClass nameMethod namePatterns foundSolution coverage
org.apache.hadoop.mapredJobClient$2run6
Package nameClass nameMethod nameException TypePatterns foundSolution coverage
org.apache.hadoop.mapredJobClient$2runInvalidJobConfException2
org.apache.hadoop.mapredJobClient$2runIOException2
org.apache.hadoop.mapredJobClient$2runFileAlreadyExistsException1
org.apache.hadoop.mapredJobClient$2runUnknownHostException1