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https://issues.apache.org/jira/browse/HADOOP-4953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HADOOP-4953.
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Resolution: Won't Fix
I'm closing this as won't fix since this parameter is mostly deprecated in lieu
of map and reduce specific environment vars.
> config property mapred.child.java.opts has maximum length that generates
> NoClassDefFoundError if exceeded
> ---------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-4953
> URL: https://issues.apache.org/jira/browse/HADOOP-4953
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf
> Affects Versions: 0.19.0
> Environment: Amazon EC2 Ubuntu 8.04 hardy AMI" (Debian version
> "lenny/sid")
> JDK 1.6.0_07-b06 from Sun
> kernel.ostype = Linux
> kernel.osrelease = 2.6.21.7-2.fc8xen
> kernel.version = #1 SMP Fri Feb 15 12:39:36 EST 2008
> powernow-k8: Found 1 Dual-Core AMD Opteron(tm) Processor 2218 HE processors
> (version 2.00.00)
> Reporter: Paul Baclace
>
> There is an unexpected max length for the value of config property
> mapred.child.java.opts that, if exceeded, generates an opaque
> NoClassDefFoundError in child tasks.
> The max length for the value is 146 chars. A length of 147 chars will cause
> the exception. For example, adding a single extra space between options will
> convert a working jvm opts clause into one that always generates
> NoClassDefFoundError when tasktrackers exec child tasks.
> As laboriously diagnosed, conf/hadoop-site.xml was used to set the property
> and runs were done on "Amazon EC2 Ubuntu 8.04 hardy AMI" (Debian version
> "lenny/sid") using java 1.6.0_07-b06. Multiple slaves nodes were used and
> after conf changes, stop-all.sh and start-all.sh were run before each test.
> The job config props as found on the slave did not appear to have a truncated
> or damaged value. It made no difference whether @taskid@ appeared at the end
> or middle of the options and absence of @taskid@ did not eliminate the
> problem.
> This bug wastes considerable time because the error looks like a classpath
> problem and even after the java opts property is suspected, a character
> quoting or unsupported option seems more likely than a length limit.
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