[HADOOP-11664] Loading predefined EC schemas from configuration

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: HDFS-7285
• Assignee: Kai Zheng
• Reporter: Kai Zheng
• Created: 06/Nov/14 09:51
• Updated: 30/Sep/15 19:38
• Resolved: 27/Mar/15 21:54

Description

System administrator can configure multiple EC codecs in hdfs-site.xml file, and codec instances or schemas in a new configuration file named ec-schema.xml in the conf folder. A codec can be referenced by its instance or schema using the codec name, and a schema can be utilized and specified by the schema name for a folder or EC ZONE to enforce EC. Once a schema is used to define an EC ZONE, then its associated parameter values will be stored as xattributes and respected thereafter.

Issue Links

• depends upon: HADOOP-11643 Define EC schema API for ErasureCodec
• is depended upon by: HDFS-7866 Erasure coding: NameNode manages multiple erasure coding policies
• is part of: HDFS-7337 Configurable and pluggable erasure codec and policy
• requires: HDFS-7839 Erasure coding: implement facilities in NameNode to create and manage EC zones