Thanks Daniel Templeton for reporting this! Post v001 patch to remove it.
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LGTM +1. I'll commit it later.
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #11953 (See https://builds.apache.org/job/Hadoop-trunk-Commit/11953/)
HADOOP-14611. NetworkTopology.DEFAULT_HOST_LEVEL is unused (Contributed (templedf: rev 5a75f73893567151f525950cc1a15b3f1bfeac26)
Thanks Daniel Templeton! Looks like this has been checked in. So I'll go close this JIRA.
Thanks for the patch, Chen Liang. Committed to trunk and branch-2.