so ,if i examine the output of "curl
http://CHBM224:50075/jmx<http://chbm224:50075/jmx>"
,it can sure which one will be used
{
"beans" : [ {
"name" : "java.lang:type=Memory",
"modelerType" : "sun.management.MemoryImpl",
"Verbose" : false,
"HeapMemoryUsage" : {
"committed" : 79953920,
"init" : 258443648,
"max" : 932118528,
"used" : 55585608
},
On Tue, Dec 10, 2013 at 3:18 PM, Pradeep Gollakota <[email protected]>wrote:
> 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
>>
>
>
