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https://issues.apache.org/jira/browse/HDDS-8949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sadanand Shenoy resolved HDDS-8949.
-----------------------------------
Resolution: Not A Problem
> Datanodes fail to start up after downgrade.
> -------------------------------------------
>
> Key: HDDS-8949
> URL: https://issues.apache.org/jira/browse/HDDS-8949
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Sadanand Shenoy
> Priority: Major
>
> Trying to perform an Ozone downgrade from a version supporting HTTP ports in
> datanode.
> {code:java}
> ERRORHddsDatanodeServiceException in HddsDatanodeService.
> java.lang.IllegalArgumentException: No enum constant
> org.apache.hadoop.hdds.protocol.DatanodeDetails.Port.Name.HTTP
> at java.lang.Enum.valueOf(Enum.java:238)
> at
> org.apache.hadoop.hdds.protocol.DatanodeDetails$Port$Name.valueOf(DatanodeDetails.java:776)
> at
> org.apache.hadoop.ozone.container.common.helpers.DatanodeIdYaml.readDatanodeIdFile(DatanodeIdYaml.java:99)
> at
> org.apache.hadoop.ozone.container.common.helpers.ContainerUtils.readDatanodeDetailsFrom(ContainerUtils.java:171)
> at
> org.apache.hadoop.ozone.HddsDatanodeService.initializeDatanodeDetails(HddsDatanodeService.java:446)
> at
> org.apache.hadoop.ozone.HddsDatanodeService.start(HddsDatanodeService.java:204)
> at
> org.apache.hadoop.ozone.HddsDatanodeService.start(HddsDatanodeService.java:190)
> at
> org.apache.hadoop.ozone.HddsDatanodeService.call(HddsDatanodeService.java:165)
> at
> org.apache.hadoop.ozone.HddsDatanodeService.call(HddsDatanodeService.java:83)
> at picocli.CommandLine.executeUserObject(CommandLine.java:1933)
> at picocli.CommandLine.access$1100(CommandLine.java:145)
> at
> picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2332)
> at picocli.CommandLine$RunLast.handle(CommandLine.java:2326)
> at picocli.CommandLine$RunLast.handle(CommandLine.java:2291)
> at
> picocli.CommandLine$AbstractParseResultHandler.handleParseResult(CommandLine.java:2152)
> at picocli.CommandLine.parseWithHandlers(CommandLine.java:2530)
> at picocli.CommandLine.parseWithHandler(CommandLine.java:2465)
> at org.apache.hadoop.hdds.cli.GenericCli.execute(GenericCli.java:96)
> at org.apache.hadoop.hdds.cli.GenericCli.run(GenericCli.java:87)
> at
> org.apache.hadoop.ozone.HddsDatanodeService.main(HddsDatanodeService.java:148)
> {code}
> I see this
> [comment|https://github.com/apache/ozone/pull/4278#issuecomment-1439184020]
> which refers to the same issue, Following the conversion on the PR, it seems
> like HDDS-8239 should have fixed the issue after introducing layout version
> for each new addition of port in the DatanodeDetails.
> However IIUC, if the the current layout version is greater than or equal to
> the layout version of the annotation , then it will write it to the file. But
> it still doesn't handle the read case of this file from an older version.
> Sequence
> 1. Datanode inits in the new version that supports HTTP port and it writes to
> the file.
> 2. Downgrade to a version not containing the HTTP port.
> 3. The file still has this value and while DN starts up and fails to read
> which is what the stacktrace points.
> It looks like some cleanup steps are required by adding an upgrade handler
> here.
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