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- "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."
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Using the "Search" bar to find them, the following configuration settings should be modified
TODO
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- 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:
(the two icons to the left of the orange circle)
Select the second of those "Client configuration redeployment needed", review the changes and select the "Restart" cluster button in the top right:
(and then the "Restart Now" button on the next page - ignore the "Rolling Restart" and leave the "Re-deploy client configuration" checked)
Final steps
Before leaving the UI, go back to the "MapReduce" service, and select (from the "Actions" button in the top right) "Download Client Configuration".
Returning to the command line:
- Copy the contents of the downloaded zip (the files in its "hadoop-conf" directory) to the "/opt/hadoop-infinite/mapreduce/hadoop" directory of each API node)
- ()
- Upgrade the API nodes to v0.5 (if not already done - restart the "tomcat6-interface-engine" nodes if v0.5 is already installed)
- Remove the "/opt/infinite-home/bin/STOP_CUSTOM"
Installing CDH5 (YARN)
IKANOW is not yet integrated with CDH5 running YARN. Once it is, this section will explain how to:
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