about mr accelerator question.

[l...@runstone.com]

Hi, 
I have been present a problem in the forum,the link is: 
http://apache-ignite-users.70518.x6.nabble.com/about-mr-accelerator-question-tc3502.html
I will follow you suggestions on the ignite cluster, but i am so sorry that 
there are some confusions. 

on the single node,with 29G data, my ignite configrution is default almost.just 
modify the ignite.sh 
as follow: 
if [ -z "$JVM_OPTS" ] ; then 
    JVM_OPTS="-Xms8g -Xmx8g -server -XX:+AggressiveOpts -XX:MaxPermSize=8g" 
fi 

and modify the default-config.xml 

 <property name="fileSystemConfiguration">
            <list>
                <bean 
class="org.apache.ignite.configuration.FileSystemConfiguration" 
parent="igfsCfgBase">
                    <property name="name" value="igfs"/>

                    
                    <property name="metaCacheName" value="igfs-meta"/>
                    <property name="dataCacheName" value="igfs-data"/>

                    
                    <property name="ipcEndpointConfiguration">
                        <bean 
class="org.apache.ignite.igfs.IgfsIpcEndpointConfiguration">
                            <property name="type" value="TCP" />
                            <property name="host" value="127.0.0.1" />
                            <property name="port" value="10500" />
                        </bean>
                    </property>

                    
                    <property name="secondaryFileSystem">
                        <bean 
class="org.apache.ignite.hadoop.fs.IgniteHadoopIgfsSecondaryFileSystem">
                            <constructor-arg name="uri" 
value="hdfs://localhost:9000"/>
                            <constructor-arg 
name="cfgPath"><null/></constructor-arg>
                            <constructor-arg name="userName" 
value="client-user-name"/>
                        </bean>
                    </property>
                </bean>
            </list>
        </property>

the result is very cool. 



the on-heap just 8G but the data have 29G.It work well.why? 



another problem is I start up another ignite node on the same server.I have 16g 
heap with two ignite node.My job is finished after 7 minutes, the effect is the 
same as on the single node.why the performance is not improve when add the 
memory? 

thanks