saveNamespace should background the writing of the FSImage files when in 
SafeMode
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                 Key: HDFS-1798
                 URL: https://issues.apache.org/jira/browse/HDFS-1798
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Matt Foley


Even with parallel writes of the FSImage files (HDFS-1071), large clusters 
still typically spend 5 minutes writing the files.  When in SafeMode, it should 
be safe to background these writes instead of waiting for them.  To enable 
this, the namenode must be prevented from leaving SafeMode until the writes are 
done.

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