Zach Amsden created HDFS-12918:
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Summary: EC Policy defaults incorrectly to enabled in protobufs
Key: HDFS-12918
URL: https://issues.apache.org/jira/browse/HDFS-12918
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Zach Amsden
Priority: Critical
According to documentation and code comments, the default setting for erasure
coding policy is disabled:
/** Policy is disabled. It's policy default state. */
DISABLED(1),
However, HDFS-12258 appears to have incorrectly set the policy state in the
protobuf to enabled:
{code:java}
message ErasureCodingPolicyProto {
ooptional string name = 1;
optional ECSchemaProto schema = 2;
optional uint32 cellSize = 3;
required uint32 id = 4; // Actually a byte - only 8 bits used
+ optional ErasureCodingPolicyState state = 5 [default = ENABLED];
}
{code}
This means the parameter can't actually be optional, it must always be
included, and existing serialized data without this optional field will be
incorrectly interpreted as having erasure coding enabled.
This unnecessarily breaks compatibility and will require existing HDFS
installations that store metadata in protobufs to require reformatting.
It looks like a simple mistake that was overlooked in code review.
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