[HADOOP-8230] Enable sync by default and disable append

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0.0
• Fix Version/s: 1.1.0
• Hadoop Flags: Incompatible change, Reviewed

Release Note

Append is not supported in Hadoop 1.x. Please upgrade to 2.x if you need append. If you enabled dfs.support.append for HBase, you're OK, as durable sync (why HBase required dfs.support.append) is now enabled by default. If you really need the previous functionality, to turn on the append functionality set the flag "dfs.support.broken.append" to true.

• Assignee: Eli Collins
• Reporter: Eli Collins
• Created: 30/Mar/12 00:42
• Updated: 02/May/13 02:30
• Resolved: 27/Apr/12 18:03

Description

Per HDFS-3120 for 1.x let's:

• Always enable the sync path, which is currently only enabled if dfs.support.append is set
• Remove the dfs.support.append configuration option. We'll keep the code paths though in case we ever fix append on branch-1, in which case we can add the config option back

Issue Links

• is related to: HDFS-3120 Enable hsync and hflush by default
• relates to: ACCUMULO-817 Clarify README regarding dfs.support.append
• relates to: HADOOP-8365 Add flag to disable durable sync