Hi, I have set the seperator value, but the same exception is thrown. As i take the first part of the whole key as the key, so i think even i didn't set the correct seperator value, it will not thrown and array index out of bound exception.
2009/3/2 jason hadoop <[email protected]> > Did you by change set the separator character to ','? > map.output.key.field.separator is the key, the default is TAB. > > On Sun, Mar 1, 2009 at 6:13 PM, Nick Cen <[email protected]> wrote: > > > Hi, > > > > my key has the format "key1,key2,key3“,and > > conf.setKeyFieldPartitionerOptions("-k 1,1"). When i limit the input > size, > > it works fine, i think this because i limit the total number of the > > possible > > "key1,key2,key3" compositions. but when i increate the input size, this > > exception was thrown. > > > > 2009/3/2 jason hadoop <[email protected]> > > > > > The way you are specifying the section of your key to compare is > reaching > > > beyond the end of the last part of the key. > > > > > > Your key specification is not terminating explicitly on the last > > character > > > of the final field of the key. > > > > > > if your key splits in to N parts, and you are comparing on the Nth > part, > > > -kN,N will work while -kN will throw the exception. > > > > > > The way the comparator picks up a piece, is it takes the piece and the > > > trailing separator by default. For the last piece there is no trailing > > > separator and you get the array out of bounds exception.. > > > > > > > > > > > > On Sun, Mar 1, 2009 at 5:38 PM, Nick Cen <[email protected]> wrote: > > > > > > > java.lang.ArrayIndexOutOfBoundsException: 4096 > > > > at > > > > > > > > > > > > > > org.apache.hadoop.io.WritableComparator.compareBytes(WritableComparator.java:129) > > > > at > > > > > > > > > > > > > > org.apache.hadoop.mapred.lib.KeyFieldBasedComparator.compareByteSequence(KeyFieldBasedComparator.java:109) > > > > at > > > > > > > > > > > > > > org.apache.hadoop.mapred.lib.KeyFieldBasedComparator.compare(KeyFieldBasedComparator.java:85) > > > > at > > > > org.apache.hadoop.mapred.Merger$MergeQueue.lessThan(Merger.java:308) > > > > at > > > > org.apache.hadoop.util.PriorityQueue.downHeap(PriorityQueue.java:139) > > > > at > > > > > org.apache.hadoop.util.PriorityQueue.adjustTop(PriorityQueue.java:103) > > > > at > > > > > > > > > > > > > > org.apache.hadoop.mapred.Merger$MergeQueue.adjustPriorityQueue(Merger.java:270) > > > > at > > > org.apache.hadoop.mapred.Merger$MergeQueue.next(Merger.java:285) > > > > at > > > > > org.apache.hadoop.mapred.Task$ValuesIterator.readNextKey(Task.java:870) > > > > at > > > org.apache.hadoop.mapred.Task$ValuesIterator.next(Task.java:829) > > > > at > > > > > > > > > > > > > > org.apache.hadoop.mapred.ReduceTask$ReduceValuesIterator.moveToNext(ReduceTask.java:237) > > > > at > > > > > > > > > > > > > > org.apache.hadoop.mapred.ReduceTask$ReduceValuesIterator.next(ReduceTask.java:233) > > > > at ufida.ReduceTask.reduce(ReduceTask.java:39) > > > > at ufida.ReduceTask.reduce(ReduceTask.java:1) > > > > at > org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:430) > > > > at org.apache.hadoop.mapred.Child.main(Child.java:155) > > > > > > > > my hadoop version is 0.19.0, if i limit the input file number, the > > > > exception > > > > wil not be thrown. > > > > -- > > > > http://daily.appspot.com/food/ > > > > > > > > > > > > > > > -- > > http://daily.appspot.com/food/ > > > -- http://daily.appspot.com/food/
