[HDFS-11505] Do not enable any erasure coding policies by default

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha4
• Fix Version/s: 3.0.0-alpha4
• Component/s: erasure-coding
• Labels: hdfs-ec-3.0-must-do
• Target Version/s: 3.0.0-alpha4
• Hadoop Flags: Incompatible change
• Release Note: By default, none of the built-in erasure coding policies are enabled. Users have to explicitly enable the erasure coding policy via the hdfs configuration 'dfs.namenode.ec.policies.enabled' before setting the policy on any directories.
• Assignee: Manoj Govindassamy
• Reporter: Andrew Wang
• Created: 06/Mar/17 22:02
• Updated: 14/Mar/17 19:14
• Resolved: 14/Mar/17 18:48

Description

As discussed on HDFS-11314, administrators need to choose the correct set of EC policies based on cluster size and desired fault-tolerance properties.

This means we should not enable any EC policies by default, since any default value could be incorrect.

Issue Links

• depends upon: HDFS-11314 Enforce set of enabled EC policies on the NameNode