概述
在Hive2.1 on Tez环境中运行select count(*) from students;时,遇到
ERROR [main]: ql.Driver (:()) - FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.tez.TezTask
查看hive日志,具体问题是:
2016-12-20T17:38:50,298 INFO [Tez session start thread]: client.TezClient (:()) - Could not connect to AM, killing session via YARN, sessionName=HIVE-c6220a27-a8a5-4d55-a36d-a6d87bd8931c, applicationId=application_1482283108292_0001
2016-12-20T17:38:50,313 INFO [Tez session start thread]: impl.YarnClientImpl (:()) - Killed application application_1482283108292_0001
2016-12-20T17:38:50,313 ERROR [Tez session start thread]: tez.TezSessionState (:()) - Failed to start Tez session
org.apache.tez.dag.api.SessionNotRunning: TezSession has already shutdown. Application application_1482283108292_0001 failed 2 times due to AM Container for appattempt_1482283108292_0001_000002 exited with exitCode: -103
For more detailed output, check application tracking page:http://master:8088/cluster/app/application_1482283108292_0001Then, click on links to logs of each attempt.
Diagnostics: Container [pid=3048,containerID=container_1482283108292_0001_02_000001] is running beyond virtual memory limits. Current usage: 139.1 MB of 1 GB physical memory used;2.6 GB of 2.1 GB virtual memory used. Killing container.
解决方法:
调整hadoop配置文件yarn-site.xml中值:
<property>
<name>yarn.scheduler.minimum-allocation-mb</name>
<value>2048</value>
<description>default value is 1024</description>
</property>
<property>
<name>yarn.nodemanager.vmem-pmem-ratio</name>
<value>2.1</value>
<description>default value is 2.1</description>
</property>
增加yarn.scheduler.minimum-allocation-mb 数量,从缺省1024改为2048;上述运行问题即刻得到解决;
单独调整yarn.nodemanager.vmem-pmem-ratio从缺省值2.1调整到3.0,从计算上Vm=3.0*1=3.0>2.6 ,但是上述问题依然存在(原因?)
原因:
该错误是YARN的虚拟内存计算方式导致,上例中用户程序申请的内存为1Gb,YARN根据此值乘以一个比例(默认为2.1)得出申请的虚拟内存的值,当YARN计算的用户程序所需虚拟内存值大于计算出来的值时,就会报出以上错误。调节比例值可以解决该问题。具体参数为:yarn-site.xml中的yarn.nodemanager.vmem-pmem-ratio
最后
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