Alexey Serbin created KUDU-2935:
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Summary: Implement built-in NTP client
Key: KUDU-2935
URL: https://issues.apache.org/jira/browse/KUDU-2935
Project: Kudu
Issue Type: New Feature
Components: clock, master, tserver
Affects Versions: 1.11.0
Reporter: Alexey Serbin
It would be nice to add a stripped-down implementation of built-in NTP client
without any reliance on the kernel NTP discipline. The built-in client should
maintain wall clock synchronized with NTP servers, and calling
{{WalltimeWithError()}} should return wall clock timestamp with the estimation
of error/offset from true time. Having built-in NTP client would provide more
control over acceptable clock error and jitter acceptable for HybridTime
timestamp generation.
>From the operability perspective, it would make it easier to run Kudu in
>containerized environments and overall make it easier for users to configure
>NTP even if they don't have superuser privileges at a node.
The very first implementation should be good enough to work with properly
configured and well behaving NTP servers, not necessarily being full-featured
and 100% RFC-compliant NTP client. Later on, we can add more features and
constraints to protect against misbehaving and rogue NTP servers.
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