| Table of Contents |
|---|
...
- "Cloudera recomments settings /proc/sys/vm/swappiness to 0"
- "There are mismatched versions across the system, which will cause failures. See below for details on which hosts are running what versions of components"
- (this just refers to Java)
- "Cloudera supports versions 1.6.0_31 and 1.7.0_55 of Oracle's JVM and later. OpenJDK is not supported, and gcj is known to not work. Check the component version table below to identify hosts with unsupported versions of Java."
...
Using the "Search" bar to find them, the following configuration settings should be modified
- Change "Number of Tasks to Run per JVM" to -1
- Set "MapReduce Service Environment Advanced Configuration Snippet (Safety Valve)" to
- JAVA_HOME="/usr/java/default/jre/"
- Find "MapReduce Child Java Opts Base" and append "-Djava.security.policy=/opt/infinite-home/config/security.policy" after (the already present) "-Djava.net.preferIPv4Stack=true" (with a space between them)
- Search for "Simultaneous" and set (eg) "Maximum Number of Simultaneous Map Tasks" to 2 and "Maximum Number of Simultaneous Reduce Tasks" to 1
- (on larger instances than the typical 15GB instances, for heavy batch analytics use, this can be increased)
Then select the "Save Changes" button. This brings up two "Stale Configuration" notifications in the top left:
...
| Code Block |
|---|
runuser hdfs -c "hadoop fs -mkdir /user/"
runuser hdfs -c "hadoop fs -mkdir /user/tomcat"
runuser hdfs -c "hadoop fs -chmod a+w /user/tomcat" |
| Warning |
|---|
Finally note that the CDH5 install has on occasion (!) stopped the "iptables" service, which is used to redirect from 8080 to 80 - this causes the cluster to lose external connectivity. To fix this, simply run "service iptables start" on all API nodes. |
Installing CDH5 (YARN)
IKANOW is not yet integrated with CDH5 running YARN. Once it is, this section will explain how to:
...