issue about remove yarn jobs history logs

[ch huang]

hi,maillist:
              i want remove jobs history logs ,and i configure the
following info in yarn-site.xml,but it seems no use ,why? ( i use CDH4.4
yarn ,i configue on each datanode ,and my job history server on one of my
datanode)

  <property>
    <name>yarn.log-aggregation-enable</name>
    <value>true</value>
  </property>
  <property>
    <description>Where to aggregate logs to.</description>
    <name>yarn.nodemanager.remote-app-log-dir</name>
    <value>/var/log/hadoop-yarn/apps</value>
  </property>
  <property>
    <name>yarn.log-aggregation.retain-seconds</name>
    <value>1209600</value>  <!-- 14 days -->
  </property>

  <property>
    <name>yarn.log-aggregation.retain-check-interval-seconds</name>
    <value>300</value>
  </property>