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Improvement AreaPerformance Recommendations
Data receiver nodes
  • Xms1024m -Xmx1024m -XX:MaxPermSize=512m

  • Change the /etc/security/limits.conf with the following values:

    Code Block
    * soft nofile 4096
* hard nofile 65535
Analyzer nodesXms1024m -Xmx1024m -XX:MaxPermSize=512m
Dashboard nodesXms1024m -Xmx1024m -XX:MaxPermSize=512m
Hadoop nodes
  • Recommended OS: Linux
  • At least 10 GB storage capacity in each node
  • At least 100 Mbps network bandwidth
  • Set hadoop.root.logger=ERROR
Cassandra nodes
  • Have separate disks for your commit log and data dirs (sstables)

  • Set the Heap memory as follows:

    System memoryHeap size
    Less than 2 GB1/2 of system memory
    2-4 GB1 GB
    More than 4 GB1/4 system memory, but not more than 8GB

  • Set following configuration in cassandra.yaml according to your hardware resources:

    • concurrent_reads: 4 * no of cores
    • concurrent_writes: 8 * no of CPU cores

For more information see Apache Cassandra 1.0 Documentation.

Memory size of Hive

In order to increase the memory size of Hive try the following configurations:

  • Increase the setting for the Hadoop heapsize. For example increase it to 4096 as shown below:
    export HADOOP_HEAPSIZE=4096
  • Add the below entry in the <BAM_HOME>/repository/conf/advanced/hive-site.xml file:  
Code Block
languagexml
<property>  
   <name>mapred.child.java.opts</name>  
   <value> -server -Xmx512M</value>  
 </property>


WSO2 Carbon platform-level settings

In multitenant mode, the WSO2 Carbon runtime limits the thread execution time. That is, if a thread is stuck or taking a long time to process, Carbon detects such threads, interrupts and stops them. Note that Carbon prints the current stack trace before interrupting the thread. This mechanism is implemented as an Apache Tomcat valve. Therefore, it should be configured in the <PRODUCT_HOME>/repository/conf/tomcat/catalina-server.xml file as shown below.

 

Code Block
languagexml
<Valve className="org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve" threshold="600"/>

 

  • The className is the Java class used for the implementation. Set it to org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve.
  • The threshold gives the minimum duration in seconds after which a thread is considered stuck. The default value is 600 seconds.

JVM settings

When an XML element has a large number of sub-elements and the system tries to process all the sub-elements, the system can become unstable due to a memory overhead. This is a security risk.

To avoid this issue, you can define a maximum level of entity substitutions that the XML parser allows in the system. You do this using the entity expansion limit attribute that is in the <DAS_HOME>/bin/wso2server.bat file (for Windows) or the <DAS_HOME>/bin/wso2server.sh file (for Linux/Solaris). The default entity expansion limit is 64000.

Code Block
languagexml
-DentityExpansionLimit=100000

In a clustered environment, the entity expansion limit has no dependency on the number of worker nodes