java.lang.NullPointerException
at RS_BP.BinPacking$BinPackingPartitioner.getPartition(BinPacking.java:46)
at RS_BP.BinPacking$BinPackingPartitioner.getPartition(BinPacking.java:1)
at org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:691)
at org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
at RS_BP.BinPackingMapper.map(BinPackingMapper.java:26)
at RS_BP.BinPackingMapper.run(BinPackingMapper.java:33)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
在eclipse跑單機模式都沒有問題,但是在叢集上跑的時候,map task就一直失敗
有人知道是什麼原因嗎??

因為我在partitioner中有用HashMap來紀錄key的一些資訊, 看了log檔發現
public int getPartition(Text key, IntWritable value, int numPartitions) {
單機模式中 sLogger.info(kR.get(word));沒有問題 有顯示出值
return 0;
叢集上 sLogger.info(kR.get(word)); 沒有印出東西 因該是null
return kR.get(word);//BinPacking.java:46
}
所以我覺得是HashMap裡面的資訊不見了
物件在單機模式跟全分布模式中的生命周期不一樣嗎??