du should be not called on every heartbeat
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Key: HADOOP-1946
URL: https://issues.apache.org/jira/browse/HADOOP-1946
Project: Hadoop
Issue Type: Bug
Components: dfs
Affects Versions: 0.15.0
Reporter: Konstantin Shvachko
Fix For: 0.15.0
Data-nodes run very slow. The reason is that du is executed on each and every
heartbeat.
Looks like the condition in DU.getUsed(), which triggers the refresh of cached
values, should be reversed.
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