[HDFS-2187] HDFS-1580: Make EditLogInputStream act like an iterator over FSEditLogOps

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.23.0
• Hadoop Flags: Reviewed
• Assignee: Ivan Kelly
• Reporter: Ivan Kelly
• Created: 22/Jul/11 14:49
• Updated: 02/May/13 02:29
• Resolved: 04/Aug/11 20:22

Description

This JIRA is for the input side changes moved out of HDFS-2149. EditLogInputStream has been changed to no longer be an InputStream implementation, but to return a stream of FSEditLogOp objects using readOp(). The upshot is that all that can ever be read from an EditLogInputStream is a op. No random hackery can be used to put other things in the stream. Version is now a property of the EditLogInputStream and retrieved using getVersion().

Issue Links

• depends upon: HDFS-2149 Move EditLogOp serialization formats into FsEditLogOp implementations
• is part of: HDFS-1580 Add interface for generic Write Ahead Logging mechanisms