<property>
<name>mapred.child.java.opts</name>
<value>-Xms512m -Xmx512m -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:+CMSClassUnloadingEnabled -XX:CMSInitiatingOccupancyFraction=80 -XX:PretenureSizeThreshold</value>
</property>
節點重啓無誤,但發現提交的job每次都setup fail,只有一一排查,最後精簡爲
<property>
<name>mapred.child.java.opts</name>
<value>-Xms512m -Xmx512m -XX:+UseConcMarkSweepGC</value>
</property>
job才正確運行,估計有些參數不支持所致。