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https://issues.apache.org/jira/browse/HDFS-17536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ZanderXu updated HDFS-17536:
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Issue Type: Improvement (was: Task)
> RBF: Format safe-mode related logic and fix a race
> ---------------------------------------------------
>
> Key: HDFS-17536
> URL: https://issues.apache.org/jira/browse/HDFS-17536
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Major
> Labels: pull-request-available
>
> RBF: Format safe-mode related logic and fix a race.
>
> Both {{RouterAdminServer#enterSafeMode()}} and
> {{RouterSafemodeService#periodicInvoke()#leave}} can change the router state
> at the same time.
> Safe-mode change logic should be condensed into one method. And some races
> may happen in the current implementation, such as:
> # {{RouterAdminServer#enterSafeMode()}} set router stat to
> {{RouterServiceState.SAFEMODE}}
> # {{RouterSafemodeService#periodicInvoke()#leave}} got true when checking
> {{safeMode && !isSafeModeSetManually}}
> # {{RouterAdminServer#enterSafeMode()}} set {{safeMode}} and
> {{isSafeModeSetManually}} to {{true}}
> # {{RouterAdminServer#enterSafeMode()}} get {{true}} when checking safe-mode
> # {{RouterSafemodeService#periodicInvoke()#leave}} call {{leave()}} to leave
> safe-mode.
> This RBF is not in safe-mode and {{safeMode}} is {{{}false{}}}, but
> {{isSafeModeSetManually}} is {{{}true{}}}.
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