[HDFS-1799] Refactor log rolling and filename management out of FSEditLog

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Edit log branch (HDFS-1073)
• Fix Version/s: Edit log branch (HDFS-1073)
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 01/Apr/11 05:37
• Updated: 05/May/11 22:39
• Resolved: 05/May/11 22:33

Description

This is somewhat similar to HDFS-1580, but less ambitious. While that JIRA focuses on pluggability, this task is simply the minimum needed for HDFS-1073:

• Refactor the filename-specific code for rolling, diverting, and reverting log streams out of FSEditLog into a new class
• Clean up the related code in FSEditLog a bit

Notably, this JIRA is going to temporarily break the BackupNode. I plan to circle back on the BackupNode later on this branch.

Issue Links

• blocks: HDFS-1801 Remove use of timestamps to identify checkpoints and logs
• incorporates: HDFS-1859 Add some convenience functions to iterate over edit log streams
• is related to: HDFS-1580 Add interface for generic Write Ahead Logging mechanisms
• is superceded by: HDFS-1858 Add state management variables to FSEditLog