make datanodes do graceful shutdown
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Key: HDFS-1350
URL: https://issues.apache.org/jira/browse/HDFS-1350
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Reporter: sam rash
Assignee: sam rash
we found that the Datanode doesn't do a graceful shutdown and a block can be
corrupted (data + checksum amounts off)
we can make the DN do a graceful shutdown in case there are open files. if this
presents a problem to a timely shutdown, we can make a it a parameter of how
long to wait for the full graceful shutdown before just exiting
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