博客原文
hackershell
在更换JDK1.625到JDK1.745后，集群出现频繁死掉NM，出现结果为如下：
2015-08-12 16:35:06,662 FATAL org.apache.hadoop.yarn.YarnUncaughtExceptionHandler: Thread Thread[process reaper,10,system] threw an Error. Shutting down now...
java.lang.OutOfMemoryError: Requested array size exceeds VM limit
at java.lang.UNIXProcess$ProcessPipeInputStream.drainInputStream(UNIXProcess.java:267)
at java.lang.UNIXProcess$ProcessPipeInputStream.processExited(UNIXProcess.java:280)
at java.lang.UNIXProcess.processExited(UNIXProcess.java:187)
at java.lang.UNIXProcess$3.run(UNIXProcess.java:175)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
和类似的
2015-08-12 16:37:56,893 FATAL org.apache.hadoop.yarn.YarnUncaughtExceptionHandler: Thread Thread[process reaper,10,system] threw an Error. Shutting down now...
java.lang.OutOfMemoryError: Java heap space
at java.lang.UNIXProcess$ProcessPipeInputStream.drainInputStream(UNIXProcess.java:267)
at java.lang.UNIXProcess$ProcessPipeInputStream.processExited(UNIXProcess.java:280)
at java.lang.UNIXProcess.processExited(UNIXProcess.java:187)
at java.lang.UNIXProcess$3.run(UNIXProcess.java:175)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
在google搜索关键字hadoop UNIXProcess drainInputStream，找到关于JDK7的一些bug，在NM负载高的情况下，出现OOM问题。 详情请看HADOOP-10146
和一些相关解释：
后来更换JDK1.7_67则没出现OOM的问题
