Junping Du created HDFS-5208:
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             Summary: Only clear network location cache on specific nodes if 
invalid NetworkTopology happens
                 Key: HDFS-5208
                 URL: https://issues.apache.org/jira/browse/HDFS-5208
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Junping Du
            Assignee: Junping Du


After HDFS-4521, once a DN is registered with invalid networktopology, all 
cached rack info in DNSToSwitchMapping will be cleared. We should only clear 
cache on specific nodes.

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