Kihwal Lee created HDFS-9426:
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Summary: Rollingupgrade finalization is not backward compatible
Key: HDFS-9426
URL: https://issues.apache.org/jira/browse/HDFS-9426
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Priority: Blocker
After HDFS-7645, the namenode can return non-null {{rollingUpgradeInfo}} in
heatbeat reponses. 2.7.1 or 2.6.x datanodes won't finalize the upgrade because
it's not null.
2.7.2rc0 datanodes will finalize the upgrade if the namenode is running 2.7.1
or 2.6, because it also checks for null {{rollingUpgradeInfo}}.
I believe the quickest fix will be to return null in hearbeat response if
rollingupgrade is not in progress.
HDFS-8656 recognized the compatibility issue of the changed semantics, but
unfortunately did not address the semantics of the heartbeat response.
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