[hadoop异常] eclipse中运行mapreduce 异常 --java.lang.OutOfMemoryError: Java heap space

描述：内存溢出，堆不够用

异常：

14/03/26 23:11:36 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

14/03/26 23:11:36 WARN mapred.JobClient: No job jar file set.  User classes may not be found. See JobConf(Class) or JobConf#setJar(String).

14/03/26 23:11:36 INFO input.FileInputFormat: Total input paths to process : 2

14/03/26 23:11:36 WARN snappy.LoadSnappy: Snappy native library not loaded

14/03/26 23:11:37 INFO mapred.JobClient: Running job: job_local_0001

14/03/26 23:11:37 INFO mapred.Task:  Using ResourceCalculatorPlugin : null

14/03/26 23:11:37 INFO mapred.MapTask: io.sort.mb = 100

14/03/26 23:11:37 WARN mapred.LocalJobRunner: job_local_0001

java.lang.OutOfMemoryError: Java heap space

at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.(MapTask.java:949)

at org.apache.hadoop.mapred.MapTask$NewOutputCollector.(MapTask.java:674)

at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:756)

at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)

at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:212)

14/03/26 23:11:38 INFO mapred.JobClient:  map 0% reduce 0%

14/03/26 23:11:38 INFO mapred.JobClient: Job complete: job_local_0001

14/03/26 23:11:38 INFO mapred.JobClient: Counters: 0

解决办法:

增大堆内存 ，右键run as -> run configurations 

参数： -Xms512M -Xmx1024M 大小根据自己情况调整