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https://issues.apache.org/jira/browse/HDFS-17116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoqiao He resolved HDFS-17116.
--------------------------------
Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Resolution: Fixed
> RBF: Update invoke millisecond time as monotonicNow() in
> RouterSafemodeService.
> -------------------------------------------------------------------------------
>
> Key: HDFS-17116
> URL: https://issues.apache.org/jira/browse/HDFS-17116
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Haiyang Hu
> Assignee: Haiyang Hu
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
>
> The following exceptions occurred in our online environment:
> # After the machine restarts, the system time is abnormal, is a time in the
> future
> # After starting the router, there is log "safemode exit for 24981702
> milliseconds...", which has been in the safemode state,
> this is mainly because the startupTime is recorded as the future system time
> when router is started at this time, and the system time returns to normal
> soon, resulting in a negative delta,
> at this time, the service can only be restored by restart the router service.
> The relevant logs are:
> {code:java}
> 2023-07-15 03:15:49,276 INFO ipc.Server xxx
> 2023-07-15 11:21:03,785 INFO router.DFSRouter (LogAdapter.java:info(51))
> [main] - STARTUP_MSG:
> /************************************************************
> STARTUP_MSG: Starting Router
> ...
> 2023-07-15 11:21:51,325 INFO xxx
> 2023-07-15 03:22:00,257 INFO xxx
> 2023-07-15 03:22:29,829 INFO router.RouterSafemodeService
> (RouterSafemodeService.java:periodicInvoke(167)) [RouterSafemodeService-0] -
> Delaying safemode exit for 28761777 milliseconds...
> {code}
> Maybe we can be compatible with this case at the code level, and reset the
> startupTime and enterSafeModeTime in the case of a negative delta,
> which can ensure that the router service can also exit the safemode state
> normally after the system time returns to normal.
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