[jira] [Created] (HDFS-11207) Unnecessary incompatible change of NNHAStatusHeartbeat.state in DatanodeProtocolProtos

["Eric Badger (JIRA)" <ji...@apache.org>]

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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