hfutatzhanghb opened a new pull request #3743:
URL: https://github.com/apache/hadoop/pull/3743
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### Description of PR
Currently in HDFS, if we update the rack info for rack-awareness, we may
need to rolling restart namenodes to let it be effective. If cluster is large,
the cost time of rolling restart namenodes is very log. So, we develope a
method to refresh topology info without rolling restart namenodes.
### How was this patch tested?
1. hdfs dfsamin -printTopology
2. upload a file to HDFS, then use `fsck` to check its block location and
rack info.
### For code changes:
https://issues.apache.org/jira/browse/HDFS-16368
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