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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-4953) config property mapred.child.java.opts has maximum length that generates NoClassDefFoundError if exceeded
Date Mon, 21 Jul 2014 17:48:40 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Allen Wittenauer resolved HADOOP-4953.

    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 =
> 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
>            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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