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https://issues.apache.org/jira/browse/KUDU-3047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexey Serbin reassigned KUDU-3047:
-----------------------------------
Assignee: Alexey Serbin
> Implement automatic selection of the time source for Kudu
> ---------------------------------------------------------
>
> Key: KUDU-3047
> URL: https://issues.apache.org/jira/browse/KUDU-3047
> Project: Kudu
> Issue Type: Improvement
> Reporter: Alexey Serbin
> Assignee: Alexey Serbin
> Priority: Major
> Labels: clock
>
> With KUDU-2936 and KUDU-3009 implemented, it's now possible to automatically
> select time source for Kudu masters and tablet servers. Assuming Kudu is not
> going to be deployed in hybrid environments (like half of the cluster in GCE,
> another in Azure), it looks like a reliable way to get the same time source
> auto-selected across a Kudu cluster.
> A few principles of the time source auto-selection are the following:
> * in well recognized environments guaranteed to provide dedicated NTP
> service, use the provided NTP server(s) for the built-in client, so it's not
> necessary to require NTP server running at Kudu nodes
> * in well recognized environments known not to provide NTP service, require
> the clock to be synchronized by an external NTP daemon
> * report on the selected time source when the diagnostic tooling is run,
> showing warnings if the time source happen to set different for different
> tablet servers in the cluster
> use the {{built\-in}} client with information provided by DHCP (if any),
> In detail:
> * AWS: use {{built\-in}}; run the built-in NTP client auto-configuration, if
> enabled
> * GCE: use {{built\-in}}; run the built-in NTP client auto-configuration, if
> enabled
> * Azure: use {{system}}; optionally try to configure the built-in client
> using the information on NTP servers provided via DHCP for the host
> * not recognized as cloud environment: use {{system}}; optionally try to
> configure the built-in client using the information on NTP servers provided
> via DHCP for the host
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