Marcel Reutegger created OAK-9517:
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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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