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Date: Mon, 12 Jan 2009 20:05:01 -0800 (PST)
From: "Paul Baclace (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-4953) config property
 mapred.child.java.opts has maximum length that generates
 NoClassDefFoundError if exceeded
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     [ https://issues.apache.org/jira/browse/HADOOP-4953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul Baclace updated HADOOP-4953:
---------------------------------

    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)


I added details of the environment in which this bug occurs.  This bug is *not* intermittent, it is easily reproduced.

Perhaps the most unusual thing about the runtime env is that Xen virtualization is involved.  The host OS seems to be fc8xen with the guest OS Ubuntu (Debian).


> 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 Core
>          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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