[HDFS-11314] Enforce set of enabled EC policies on the NameNode

• Type: Sub-task
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1
• 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: HDFS will now restrict the set of erasure coding policies that can be set by users. The set of allowed policies can be configured via "dfs.namenode.ec.policies.enabled" on the NameNode. Please see the documentation for more details.
• Assignee: Andrew Wang
• Reporter: Andrew Wang
• Created: 11/Jan/17 02:18
• Updated: 09/Mar/17 02:26
• Resolved: 09/Mar/17 00:42

Description

Filing based on discussion in HDFS-8095. A user might specify a policy that is not appropriate for the cluster, e.g. a RS (10,4) policy when the cluster only has 10 nodes. The NN should only allow the client to choose from a pre-approved list determined by the cluster administrator.

Issue Links

• is depended upon by: HDFS-11505 Do not enable any erasure coding policies by default