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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