Good question... answer is: it depends. I *think* Oracle JDK applies the rightmost. See this SO for more info. http://stackoverflow.com/questions/2740725/duplicated-java-runtime-options-what-is-the-order-of-preference
On Mon, Dec 9, 2013 at 11:14 PM, ch huang <[email protected]> wrote: > hi,maillist: > i have a job running very slowly,when i examine cluster,i find > my hdfs user using 170m swap though top command,that's user run datanode > daemon ,ps output show following info,there are two -Xmx value ,and i do > not know which value is the real ,1000m or 10240m > > # ps -ef|grep 2853 > root 2095 1937 0 15:06 pts/4 00:00:00 grep 2853 > hdfs 2853 1 5 Nov07 ? 1-22:34:22 > /usr/java/jdk1.7.0_45/bin/java -Dproc_datanode -Xmx1000m > -Dhadoop.log.dir=/var/log/hadoop-hdfs > -Dhadoop.log.file=hadoop-hdfs-datanode-ch14.log > -Dhadoop.home.dir=/usr/lib/hadoop -Dhadoop.id.str=hdfs > -Dhadoop.root.logger=INFO,RFA > -Djava.library.path=/usr/lib/hadoop/lib/native > -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true > -server -Xmx10240m -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps > -Xloggc:/var/log/hadoop-hdfs/gc-ch14-datanode.log > -Dhadoop.security.logger=INFO,RFAS > org.apache.hadoop.hdfs.server.datanode.DataNode >
