Jitendra Shukla created HDDS-13955:
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Summary: Handle empty datanode.id file case gracefully
Key: HDDS-13955
URL: https://issues.apache.org/jira/browse/HDDS-13955
Project: Apache Ozone
Issue Type: Improvement
Reporter: Jitendra Shukla
If the datanode.id file is empty Ozone datanode fails to startup with below
mentioned exception.
{code:java}
2025-11-05 09:15:11,957 ERROR
[main]-org.apache.hadoop.ozone.HddsDatanodeService: Exception in
HddsDatanodeService.
java.lang.NullPointerException
at
org.apache.hadoop.ozone.container.common.helpers.DatanodeIdYaml.readDatanodeIdFile(DatanodeIdYaml.java:96)
at
org.apache.hadoop.ozone.container.common.helpers.ContainerUtils.readDatanodeDetailsFrom(ContainerUtils.java:176)
at
org.apache.hadoop.ozone.HddsDatanodeService.initializeDatanodeDetails(HddsDatanodeService.java:444)
at
org.apache.hadoop.ozone.HddsDatanodeService.start(HddsDatanodeService.java:224)
at
org.apache.hadoop.ozone.HddsDatanodeService.start(HddsDatanodeService.java:210)
at
org.apache.hadoop.ozone.HddsDatanodeService.call(HddsDatanodeService.java:178)
at org.apache.hadoop.ozone.HddsDatanodeService.call(HddsDatanodeService.java:95)
at picocli.CommandLine.executeUserObject(CommandLine.java:1953)
at picocli.CommandLine.access$1300(CommandLine.java:145)
at
picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2352)
at picocli.CommandLine$RunLast.handle(CommandLine.java:2346)
at picocli.CommandLine$RunLast.handle(CommandLine.java:2311)
at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2179)
at picocli.CommandLine.execute(CommandLine.java:2078)
at org.apache.hadoop.hdds.cli.GenericCli.execute(GenericCli.java:100)
at org.apache.hadoop.hdds.cli.GenericCli.run(GenericCli.java:91)
at
org.apache.hadoop.ozone.HddsDatanodeService.main(HddsDatanodeService.java:160)
{code}
The workaround for this issue is to fetch the datanode UUID from the VERSION
file under hdds.datanode.dir directory and add the same to the datanode.id file
in below format and then restart datanode.
{code:java}
!!org.apache.hadoop.ozone.container.common.helpers.DatanodeIdYaml$DatanodeDetailsYaml
{
uuid: <uuid from the version file under hdds.datanode.id>
} {code}
We can handle this in a more graceful way by attempting to rebuild to file.
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