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| Warning |
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For Amazon installs on nodes that use Amazon's built-in DNS but are configured with a Route 53 (or similar) hostname, Cloudera reports the installs as failing on the heartbeat - just ignore this and carry on. When you get to the role assignment page, it will only let you assign to the "Cloudera Manager" node. At that point in a new tab:
Once everything is installed, you will likely see some "Java hostname consistency" errors. These can be suppressed in the Manager app by following the links. |
The next page is the "Host inspector" - this page will provide warnings and errors. The following warnings can be ignored:
- "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
- 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:
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