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Re: issue about datanode memory usage
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
>>
>
>