runzhiwang opened a new pull request #740: HDDS-3307. Improve write efficiency by avoiding reverse DNS lookup URL: https://github.com/apache/hadoop-ozone/pull/740 ## What changes were proposed in this pull request? **What's the problem ?** When create key, [getHostName()](https://github.com/apache/hadoop-ozone/blob/master/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/request/OMClientRequest.java#L130) by IP need reverse DNS lookup, cost about 15ms. It's also reported in [JDK-6450279](https://bugs.openjdk.java.net/browse/JDK-6450279) **How to fix ?** client getLocalHost().getHostName() and add it in request, server get hostname from request. ## What is the link to the Apache JIRA https://issues.apache.org/jira/browse/HDDS-3307 ## How was this patch tested? Existed UT and IT.
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