Add Closeable to JournalManager
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Key: HDFS-2334
URL: https://issues.apache.org/jira/browse/HDFS-2334
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Ivan Kelly
Assignee: Ivan Kelly
A JournalManager may take hold of resources for the duration of their lifetime.
This isn't the case at the moment for FileJournalManager, but
BookKeeperJournalManager will, and it's conceivable that FileJournalManager
could take a lock on a directory etc.
This JIRA is to add Closeable to JournalManager so that these resources can be
cleaned up when FSEditLog is closed.
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