Danny Becker created HDFS-17167:
-----------------------------------
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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