[jboss-jira] [JBoss JIRA] Resolved: (JBAS-6092) Check and warn if system time is off on joining node

[Brian Stansberry (JIRA)]

     [ https://jira.jboss.org/jira/browse/JBAS-6092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brian Stansberry resolved JBAS-6092.
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    Resolution: Done


This is done via the TimestampDiscrepancyWarnService configured in deploy/cluster/timestamps-jboss-beans.xml. By default it logs a WARN if it detects a discrepancy of > 2 minutes in the system clock of the node and another node.  It can be configured to log an ERROR instead, and the max discrepancy can be configured as well, with ms precision.

TimestampDiscrepancyWarnService uses the general purpose TimestampDiscrepancyService as its source of data on system clock differences. That service uses a group RPC over HAPartition to check for system clock differences.  The accuracy of the check is only as good as the amount of time it takes to make the group RPC. So, this service should not be configured to warn about very small differences.

> Check and warn if system time is off on joining node
> ----------------------------------------------------
>
>                 Key: JBAS-6092
>                 URL: https://jira.jboss.org/jira/browse/JBAS-6092
>             Project: JBoss Application Server
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>          Components: Clustering
>            Reporter: Radoslav Husar
>            Assignee: Brian Stansberry
>            Priority: Minor
>             Fix For: JBossAS-5.1.0.CR1
>
>
> When new node joins the cluster, It can simply exchange time with other nodes. If the time is off by significant number of seconds, it would warn the administrator to synchronize the time on cluster machines. Since some services depend on having time synchronized, this could help users to find this problem quickly.

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