Use WritableUtils.readVInt() in RegionLoad.readFields()
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Key: HBASE-5256
URL: https://issues.apache.org/jira/browse/HBASE-5256
Project: HBase
Issue Type: Task
Reporter: Zhihong Yu
Fix For: 0.94.0
Currently in.readInt() is used in RegionLoad.readFields()
More metrics would be added to RegionLoad in the future, we should utilize
WritableUtils.readVInt() to reduce the amount of data exchanged between Master
and region servers.
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