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https://issues.apache.org/jira/browse/HADOOP-3171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12587606#action_12587606
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Owen O'Malley commented on HADOOP-3171:
---------------------------------------
I left off:
4. Use the tool interface that lets you define properties and config files on
the command line.
Either the command line or the environment variable should work for you.
> speculative execution should not have default value on hadoop-default.xml
> bundled in the Hadoop JAR
> ---------------------------------------------------------------------------------------------------
>
> Key: HADOOP-3171
> URL: https://issues.apache.org/jira/browse/HADOOP-3171
> Project: Hadoop Core
> Issue Type: Bug
> Components: conf
> Affects Versions: 0.16.2
> Environment: all
> Reporter: Alejandro Abdelnur
> Assignee: Arun C Murthy
> Attachments: HADOOP-3171_20080410.patch
>
>
> Having a default value for speculative execution in the hadoop-default.xml
> bundled in the Hadoop JAR file does not allow a cluster to control the
> default behavior.
> *ON in hadoop-default.xml (current behavior)*
> * ON in JT hadoop-site.xml
> * present in job.xml, job's value is used
> * not-present in job.xml, ON is taken as default from the hadoop-default.xml
> present in the client's JAR/conf (*)
> * ON FINAL in the JT hadoop-site.xml
> * present or not present in the job.xml, ON is used
> * OFF in JT hadoop-site.xml
> * present in job.xml, job's value is used
> * not-present in job.xml, ON is taken as default from the hadoop-default.xml
> present in the client's JAR/conf
> * OF FINAL in the JT hadoop-site.xml
> * present or not present in the job.xml, OFF is used
> *OFF in hadoop-default.xml (not current behavior)*
> * ON in JT hadoop-site.xml
> * present in job.xml, job's value is used
> * not-present in job.xml, OFF is taken as default from the
> hadoop-default.xml present in the client's JAR/conf (*)
> * ON FINAL in the JT hadoop-site.xml
> * present or not present in the job.xml, ON is used
> * OFF in JT hadoop-site.xml
> * present in job.xml, job's value is used
> * not-present in job.xml, ON is taken as default from the hadoop-default.xml
> present in the client's JAR/conf
> * OF FINAL in the JT hadoop-site.xml
> * present or not present in the job.xml, OFF is used
> ---
> Still is desirable for the JT to have a default value. To avoid having to
> support 2 hadoop-default.xml files, one for the JT and other for the clients,
> the easiest why is to remove it from the hadoop-default.xml and have the
> default value in the code when getting the config property (thing that may be
> already happening).
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