Eric Badger created HDFS-11207:
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Summary: Unnecessary incompatible change of
NNHAStatusHeartbeat.state in DatanodeProtocolProtos
Key: HDFS-11207
URL: https://issues.apache.org/jira/browse/HDFS-11207
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Eric Badger
Assignee: Eric Badger
HDFS-5079 changed the meaning of state in {{NNHAStatusHeartbeat}} when it added
in the {{INITIALIZING}} state via {{HAServiceStateProto}}.
Before change:
{noformat}
enum State {
ACTIVE = 0;
STANDBY = 1;
}
{noformat}
After change:
{noformat}
enum HAServiceStateProto {
INITIALIZING = 0;
ACTIVE = 1;
STANDBY = 2;
}
{noformat}
So the new {{INITIALIZING}} state will be interpreted as {{ACTIVE}}, new
{{ACTIVE}} interpreted as {{STANDBY}} and new {{STANDBY}} interpreted as
unknown. Any rolling upgrade to 3.0.0 will break because the datanodes that
haven't been updated will misinterpret the NN state.
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