SammiChen created HDFS-12414:
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Summary: Ensure to use CLI command to enable/disable erasure
coding policy
Key: HDFS-12414
URL: https://issues.apache.org/jira/browse/HDFS-12414
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: SammiChen
Currently, there are two methods for user to enable/disable a erasure coding
policy. One is through "dfs.namenode.ec.policies.enabled" property which is a
static way to configure the enabled erasure coding policies. Another is through
"enableErasureCodingPolicy" or "disabledErasureCodingPolicy" API which can
enabled or disable erasure coding policy at runtime.
When Namenode restart, there is potential state conflicts between the policy
defined in "dfs.namenode.ec.policies.enabled" and policy saved in fsImage. To
resolve the conflict and simplify the operation, it's better to use just one
way and remove the old method configuring the property.
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