DataNode should validate the data integrity of a block before updating it
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Key: HADOOP-4769
URL: https://issues.apache.org/jira/browse/HADOOP-4769
Project: Hadoop Core
Issue Type: Bug
Reporter: Tsz Wo (Nicholas), SZE
DataNode currently only validate the existence of the block and meta files
before update. The data integrity of a block should also be validated.
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