MapReduce中的Java堆空间
问题描述:
我在具有32GB内存的计算机上运行MapReduce作业,但出现JAVA堆空间错误。我已经设置yarn.nodemanager.resource.memory-mb
为32GB,希望我有足够的内存来运行这些任务,但我猜不是。我应该如何配置MapReduce v2才没有这个问题?MapReduce中的Java堆空间
EDIT:
16/08/30 19:00:49 INFO mapreduce.Job: Task Id : attempt_1472579604725_0003_m_000000_0, Status : FAILED
Error: Java heap space
16/08/30 19:00:55 INFO mapreduce.Job: Task Id : attempt_1472579604725_0003_m_000000_1, Status : FAILED
Error: Java heap space
16/08/30 19:01:00 INFO mapreduce.Job: Task Id : attempt_1472579604725_0003_m_000000_2, Status : FAILED
Error: Java heap space
[2] mapred-site.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property> <name>mapreduce.framework.name</name> <value>yarn</value> </property>
<property> <name>mapreduce.jobhistory.done-dir</name> <value>/root/Programs/hadoop/logs/history/done</value> </property>
<property> <name>mapreduce.jobhistory.intermediate-done-dir</name> <value>/root/Programs/hadoop/logs/history/intermediate-done-dir</value> </property>
<property> <name>mapreduce.job.reduces</name> <value>2</value> </property>
<!-- property> <name>yarn.nodemanager.resource.memory-mb</name> <value>10240</value> </property>
<property> <name>yarn.scheduler.minimum-allocation-mb</name> <value>1024</value> </property -->
<!-- property><name>mapreduce.task.files.preserve.failedtasks</name><value>true</value></property>
<property><name>mapreduce.task.files.preserve.filepattern</name><value>*</value></property -->
[3] yarn-site.xml
<configuration>
<property> <name>yarn.log-aggregation-enable</name> <value>true</value> </property>
<property> <name>yarn.nodemanager.aux-services</name> <value>mapreduce_shuffle</value> </property>
<property> <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name> <value>org.apache.hadoop.mapred.ShuffleHandler</value> </property>
<property> <name>yarn.resourcemanager.resource-tracker.address</name> <value>s8:8025</value> </property>
<property> <name>yarn.resourcemanager.scheduler.address</name> <value>s8:8030</value> </property>
<property> <name>yarn.resourcemanager.address</name> <value>s8:8032</value> </property>
<property> <name>yarn.log.server.url</name> <value>http://s8:19888/jobhistory/logs/</value> </property>
<!-- job history -->
<property> <name>yarn.log-aggregation-enable</name> <value>true</value> </property>
<property> <name>yarn.nodemanager.log.retain-seconds</name> <value>900000</value> </property>
<property> <name>yarn.nodemanager.remote-app-log-dir</name> <value>/app-logs</value> </property>
<!-- proxy -->
<property><name>yarn.web-proxy.address</name><value>s8:9046</value></property>
<!-- to check the classpath in yarn, do yarn classpath -->
<!-- compress output data -->
<property><name>mapreduce.output.fileoutputformat.compress</name><value>false</value></property>
<property><name>mapred.output.fileoutputformat.compress.codec</name><value>org.apache.hadoop.io.compress.BZip2Codec</value></property>
<!-- Node configuration -->
<property> <name>yarn.nodemanager.resource.memory-mb</name> <value>33554432</value> </property>
</configuration>
答
参数yarn.nodemanager.resource.memory-mb
告诉多少资源可用于纱线(从重复注释)
如果您希望您的mapreduce程序使用这些资源,您应该设置以下参数。
mapreduce.map.memory.mb
mapreduce.map.java.opts
mapreduce.reduce.memory.mb
mapreduce.reduce.java.opts
只要确保将java.opts设置为比memory.md小10-20%。
根据当前使用情况:使用1 GB物理内存246.6 MB;使用了34.1 GB的2.1 GB虚拟内存。杀死容器。“,我想你调整了错误的记忆值。例如,'yarn.nodemanager.resource.memory-mb'表示只有10 Gb的32 Gb可以分配给YARN容器(如果没有评论) –
这些值应该放在'yarn-site.xml'中,而不是'mapred-site.xml' –