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https://issues.apache.org/jira/browse/HDFS-17167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Danny Becker updated HDFS-17167:
--------------------------------
Attachment: HDFS-17167.001.patch
Status: Patch Available (was: Open)
> 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
> Priority: Minor
> Attachments: HDFS-17167.001.patch
>
>
> 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:
> {code:java}
> 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)
> "{code}
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