Override log4j property file via oozie workflow for java action

[#1]

Put log4j on HDFS path and then use HDFS path in workflow to override.

Sample log4j file:

#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. See accompanying LICENSE file.
#
# Define some default values that can be overridden by system properties
hadoop.root.logger=DEBUG,CLA


# Define the root logger to the system property "hadoop.root.logger".
log4j.rootLogger=${hadoop.root.logger}, EventCounter


# Logging Threshold
log4j.threshold=ALL


#
# ContainerLog Appender
#


#Default values
yarn.app.container.log.dir=null
yarn.app.container.log.filesize=100


log4j.appender.CLA=org.apache.hadoop.yarn.ContainerLogAppender
log4j.appender.CLA.containerLogDir=${yarn.app.container.log.dir}
log4j.appender.CLA.totalLogFileSize=${yarn.app.container.log.filesize}


log4j.appender.CLA.layout=org.apache.log4j.PatternLayout
log4j.appender.CLA.layout.ConversionPattern=%d{ISO8601} %p [%t] %c: %m%n


log4j.appender.CRLA=org.apache.hadoop.yarn.ContainerRollingLogAppender
log4j.appender.CRLA.containerLogDir=${yarn.app.container.log.dir}
log4j.appender.CRLA.maximumFileSize=${yarn.app.container.log.filesize}
log4j.appender.CRLA.maxBackupIndex=${yarn.app.container.log.backups}
log4j.appender.CRLA.layout=org.apache.log4j.PatternLayout
log4j.appender.CRLA.layout.ConversionPattern=%d{ISO8601} %p [%t] %c: %m%n


#
# Event Counter Appender
# Sends counts of logging messages at different severity levels to Hadoop Metrics.
#
log4j.appender.EventCounter=org.apache.hadoop.log.metrics.EventCounter

Sample Workflow.xml:

<workflow-app name="javaaction" xmlns="uri:oozie:workflow:0.5">
    <global>
        <job-tracker>${jobTracker}</job-tracker>
        <name-node>${nameNode}</name-node>
    </global>
    <start to="java-action"/>
    <kill name="kill">
        <message>Action failed, error message[${wf:errorMessage(wf:lastErrorNode())}]</message>
    </kill>
    <action name="java-action">
        <java>
            <configuration>
                <property>
                    <name>oozie.launcher.mapreduce.task.classpath.user.precedence</name>
                    <value>true</value>
                </property>
                <property>
                    <name>oozie.launcher.mapreduce.user.classpath.first</name>
                    <value>true</value>
                </property>
                <property>
                    <name>oozie.launcher.mapred.job.name</name>
                    <value>test</value>
                </property>
                <property>
                    <name>oozie.launcher.mapreduce.job.log4j-properties-file</name>
                    <value>${nameNode}/tmp/log4j.properties</value>
                </property>
            </configuration>
            <main-class>WordCount2</main-class>
            <arg>${nameNode}/tmp/input</arg>
            <arg>${nameNode}/tmp/output2</arg>
        </java>
        <ok to="end"/>
        <error to="kill"/>
    </action>
    <end name="end"/>
</workflow-app>