Generation stamp value should be validated when creating a Block
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Key: HADOOP-5413
URL: https://issues.apache.org/jira/browse/HADOOP-5413
Project: Hadoop Core
Issue Type: Improvement
Components: dfs
Reporter: Tsz Wo (Nicholas), SZE
In hdfs, generation stamps < GenerationStamp.FIRST_VALID_STAMP are reserved
values but not valid generation stamps. Incorrect uses of the reserved values
may cause unexpected behavior. We should validate generation stamp when
creating a Block.
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