FAQ
there is no error message displayed while using the command "daemonlog -setlevel" with illegal level
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Key: HADOOP-7434
URL: https://issues.apache.org/jira/browse/HADOOP-7434
Project: Hadoop Common
Issue Type: Improvement
Affects Versions: 0.23.0
Reporter: 严金双


While using the command with inexistent "level" like "nomsg", there is no error message displayed,and the level "DEBUG" is set by default.

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  • skaterQiang at Jun 30, 2011 at 2:46 am
    Hello guys:
    I want to debug the map reduce tasks, especially org.apache.hadoop.mapred.ReduceTask
    I want to understand how the data flow work.
    So I add the following in the mapred-site.xml
    <property>
    <name>mapred.child.java.opts</name>
    <value>-Xdebug -Xrunjdwp:transport=dt_socket,address=8888,server=y,suspend=y</value>
    </property>
    mapreduce.tasktracker.map.tasks.maximum 1
    mapreduce.tasktracker.reduce.tasks.maximum 1
    But by debugging JvmRunner, the -Xdebug is not added into the JVM start up command.
    Why? Is there some where guard this?
    Or I have to build hadoop with my debug code?


    Regards,
    Skater

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postedJun 30, '11 at 2:01a
activeJun 30, '11 at 2:46a
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