Constructor Detail

• DefaultMetricsSystemHelper

  public DefaultMetricsSystemHelper()

Method Detail

• removeObjectName

  public boolean removeObjectName(String name)

• removeSourceName

  public void removeSourceName(String name)

  Unfortunately Hadoop tries to be too-clever and permanently keeps track of all names registered so far as a Source, thus preventing further re-registration of the source with the same name. In case of dynamic metrics tied to region-lifecycles, this becomes a problem because we would like to be able to re-register and remove with the same name. Otherwise, it is resource leak. This ugly code manually removes the name from the UniqueNames map. TODO: May not be needed for Hadoop versions after YARN-5190.