[jira] [Created] (OAK-9517) Incorrect time difference warning

["Marcel Reutegger (Jira)" <ji...@apache.org>]

Marcel Reutegger created OAK-9517:
-------------------------------------

             Summary: Incorrect time difference warning
                 Key: OAK-9517
                 URL: https://issues.apache.org/jira/browse/OAK-9517
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: documentmk
            Reporter: Marcel Reutegger
            Assignee: Marcel Reutegger
             Fix For: 1.42.0


The changes for OAK-9477 introduced a regression when there is just a single clusterId in use. The background thread then logs two messages every second:

{noformat}
29.07.2021 10:36:30.550 *WARN* [DocumentNodeStore background read thread (1)] org.apache.jackrabbit.oak.plugins.document.util.Utils Detected clock differences. Local time is 'Thu Jul 29 10:36:30 UTC 2021', while most recent external time is 'Sun Dec 02 16:47:04 UTC 292269055'. Current _lastRev entries: [r17af1d646de-0-1]
29.07.2021 10:36:30.550 *WARN* [DocumentNodeStore background read thread (1)] org.apache.jackrabbit.oak.plugins.document.util.Utils Background read will be delayed by -9223373664409766.0 seconds. Please check system time on cluster nodes.
{noformat}

There is no negative impact on the system other than the log messages. The background thread is not actually delayed, because the duration is negative.

This behaviour is caused by {{Utils.getMaxExternalTimestamp()}} returning {{Long.MIN_VALUE}} when there is just one clusterId in use. With the changes from OAK-9477 the implementation then incorrectly thinks there are clock differences.



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