[HDFS-6061] Allow dfs.datanode.shared.file.descriptor.path to contain multiple entries and fall back when needed

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.4.0
• Component/s: datanode
• Target Version/s: 2.4.0
• Assignee: Colin McCabe
• Reporter: Colin McCabe
• Created: 06/Mar/14 01:53
• Updated: 10/Apr/14 13:11
• Resolved: 06/Mar/14 08:37

Description

In SharedFileDescriptorFactory, it would be nice if dfs.datanode.shared.file.descriptor.path could contain multiple entries and allow fallback between them. That way, if a user doesn't have /dev/shm configured (the current default), the user could use /tmp. This is mainly a concern on BSDs and some other systems where /dev/shm doesn't exist.