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https://issues.apache.org/jira/browse/HDFS-17309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDFS-17309:
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Labels: pull-request-available (was: )
> Fix Router Safemode check contidition error
> -------------------------------------------
>
> Key: HDFS-17309
> URL: https://issues.apache.org/jira/browse/HDFS-17309
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: liuguanghua
> Priority: Major
> Labels: pull-request-available
>
> With HDFS-17116, Router safemode check contidition use monotonicNow().
> For code in RouterSafemodeService.periodicInvoke()
> long now = monotonicNow();
> long cacheUpdateTime = stateStore.getCacheUpdateTime();
> boolean isCacheStale = (now - cacheUpdateTime) > this.staleInterval;
>
> Function monotonicNow() is implemented with System.nanoTime().
> System.nanoTime() in javadoc description:
> This method can only be used to measure elapsed time and is not related to
> any other notion of system or wall-clock time. The value returned represents
> nanoseconds since some fixed but arbitrary origin time (perhaps in the
> future, so values may be negative).
>
> The following situation maybe exists ：
> If refreshCaches not success in the beginning, cacheUpdateTime will be 0 ,
> and now - cacheUpdateTime is arbitrary origin time，so isCacheStale maybe be
> true or false.
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