[jira] [Created] (HDFS-17167) Observer NameNode startup option

["Danny Becker (Jira)" <ji...@apache.org>]

Danny Becker created HDFS-17167:
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             Summary: Observer NameNode startup option
                 Key: HDFS-17167
                 URL: https://issues.apache.org/jira/browse/HDFS-17167
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 3.3.4
            Reporter: Danny Becker


NameNode currently uses a "StartupOption" to decide whether to start a node as an Observer NameNode. This causes an issue during a rolling upgrade because "rollingUpgrade" is also a StartupOption and NameNode will only allow 1 startup option, choosing the last startup option in the list. Observer in our environment starts with the following startup options: ["-rollingUpgrade", "started", "-observer"]. This means that the rolling upgrade gets ignored which causes Observer to have an issue when an actual rolling upgrade is ongoing:
2023-08-23T14:59:03.486-0700,WARN,[main],org.apache.hadoop.hdfs.server.namenode.FSNamesystem,"Encountered exception loading fsimage
java.io.IOException: 
File system image contains an old layout version -63.
An upgrade to version -66 is required.
Please restart NameNode with the \'-rollingUpgrade started\' option if a rolling upgrade is already started; or restart NameNode with the \'-upgrade\' option to start a new upgrade.
	at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:271)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1116)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:724)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:681)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:763)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:1013)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:992)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1743)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1811)
"
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