liuguanghua created HDFS-17309:
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Summary: 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
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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