[HADOOP-8365] Add flag to disable durable sync

• Type: Improvement
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.1.0
• Fix Version/s: 1.1.0
• Hadoop Flags: Incompatible change, Reviewed

Release Note

This patch enables durable sync by default. Installation where HBase was not used, that used to run without setting "dfs.support.append" or setting it to false explicitly in the configuration, must add a new flag "dfs.durable.sync" and set it to false to preserve the previous semantics.

• Assignee: Eli Collins
• Reporter: Eli Collins
• Created: 07/May/12 17:53
• Updated: 17/Oct/12 18:27
• Resolved: 11/Jul/12 23:08

Description

Per HADOOP-8230 there's a request for a flag to disable the sync code paths that dfs.support.append used to enable. The sync method itself will still be available and have a broken implementation as that was the behavior before HADOOP-8230. This config flag should default to false as the primary motivation for HADOOP-8230 is so HBase works out-of-the-box with Hadoop 1.1.

Issue Links

• is related to: HADOOP-8230 Enable sync by default and disable append