Redundant field: DatanodeDescriptor.isAlive
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Key: HADOOP-944
URL: https://issues.apache.org/jira/browse/HADOOP-944
Project: Hadoop
Issue Type: Improvement
Reporter: Konstantin Shvachko
The lastUpdate field should be used for determining whether the data-node is
dead or alive.
The DatanodeDescriptor should have isAlive() method rather than the field.
Synchronizing different fields having the same meaning often leads to mistakes.
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