Add JournalSet to manage the set of journals.
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Key: HDFS-2158
URL: https://issues.apache.org/jira/browse/HDFS-2158
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Jitendra Nath Pandey
Assignee: Jitendra Nath Pandey
Fix For: 0.23.0
The management of the collection of journals can be encapsulated in a
JournalSet. This will cleanup the FSEditLog code significantly.
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