pig 使用tez引擎 OutOfMemoryError，outofmemoryerror

pig 使用tez引擎 OutOfMemoryError，outofmemoryerror

tez版本：0.5.3

pig版本：0.14.0 

解决办法：

将tez.task.scale.memory.reserve-fraction 设置的大点。如下：

set tez.task.scale.memory.reserve-fraction 0.7d ; 

报错详情见下：

cause TezChild exit.:java.lang.OutOfMemoryError: Java heap space
        at org.apache.tez.runtime.library.common.sort.impl.dflt.DefaultSorter.<init>(DefaultSorter.java:140)
        at org.apache.tez.runtime.library.output.OrderedPartitionedKVOutput.start(OrderedPartitionedKVOutput.java:114)
        at org.apache.pig.backend.hadoop.executionengine.tez.runtime.PigProcessor.initializeOutputs(PigProcessor.java:299)
        at org.apache.pig.backend.hadoop.executionengine.tez.runtime.PigProcessor.run(PigProcessor.java:181)
        at org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:324)
        at org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable$1.run(TezTaskRunner.java:176)
        at org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable$1.run(TezTaskRunner.java:168)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:415)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1796)
        at org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable.call(TezTaskRunner.java:168)
        at org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable.call(TezTaskRunner.java:163)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)