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

来源：互联网发布：ireport软件编辑：程序博客网时间：2024/05/18 15:25

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.<init>(MapTask.java:949)

at org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(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

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