savenamespace should write the fsimage to all configured fs.name.dir in parallel
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Key: HDFS-1071
URL: https://issues.apache.org/jira/browse/HDFS-1071
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Reporter: dhruba borthakur
Assignee: Dmytro Molkov
If you have a large number of files in HDFS, the fsimage file is very big. When
the namenode restarts, it writes a copy of the fsimage to all directories
configured in fs.name.dir. This takes a long time, especially if there are many
directories in fs.name.dir. Make the NN write the fsimage to all these
directories in parallel.
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