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Posted to oak-issues@jackrabbit.apache.org by "Stefan Egli (JIRA)" <ji...@apache.org> on 2016/02/24 17:38:18 UTC

[jira] [Commented] (OAK-4030) DocumentNodeStore: required server time accuracy

    [ https://issues.apache.org/jira/browse/OAK-4030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15163296#comment-15163296 ] 

Stefan Egli commented on OAK-4030:
----------------------------------

Re the fact that some RDB have a server time resolution of 1sec - resulting in higher likelihood of the overall diff to be reported as 2 sec - the [DocumentNodeStore allows up to 2000ms diff|https://github.com/apache/jackrabbit-oak/blob/trunk/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/document/DocumentNodeStoreService.java#L516] (using &gt;) - so no need for any change in that regard

> DocumentNodeStore: required server time accuracy
> ------------------------------------------------
>
>                 Key: OAK-4030
>                 URL: https://issues.apache.org/jira/browse/OAK-4030
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: documentmk
>            Reporter: Julian Reschke
>              Labels: resilience
>             Fix For: 1.4
>
>
> The DocumentNodeStore currently requires that the local time and the persistence time differ at most 2 seconds.
> I recently tried to run a cluster with two Windows machines, and despite them being configured to use the same NTP service, they were still 4..5 s off.
> https://blogs.technet.microsoft.com/askds/2007/10/23/high-accuracy-w32time-requirements/ seems to confirm that by default, Windows can't provide the required accuracy.
> One workaround seems to be to install custom ntp clients; but do we really want to require this?



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