Why are XFRs to Secondaries equally fast?
Klaus Darilion
klaus.darilion at nic.at
Thu Jul 27 09:17:08 UTC 2023
Hello!
Yesterday I made some tests transferring a zone with 50mio RRs to 35 Secondaries. I measured the time between:
- Primary logs "zone test/IN: sending notifies"
- Primary logs "client xxxx: transfer of 'test/IN': AXFR-style IXFR ended"
What makes we wonder is, that for several secondaries the XFR duration is equally fast although these secondaries are globally distributed with different RTTs and different VMs:
173 seconds
173 seconds
404 seconds
405 seconds
609 seconds
620 seconds
622 seconds
638 seconds
838 seconds
838 seconds
839 seconds
839 seconds
843 seconds
848 seconds
859 seconds
1031 seconds
1032 seconds
1032 seconds
1035 seconds
1037 seconds
1038 seconds
1038 seconds
1038 seconds
1043 seconds
1702 seconds
2359 seconds
2361 seconds
2361 seconds
2361 seconds
2361 seconds
2361 seconds
2361 seconds
2361 seconds
2361 seconds
2362 seconds
For example, there are 8 secondaries (Mumbai, LosAngeles, Melbourne, Atlante, SaoPaulo...) to which the XFR took 2361 seconds.
Are there some mechanisms in Bind that put multiple XFRs together into a common stream? Or do you have any other ideas how it come that several XFRs are equally fast?
Thanks
Klaus
--
Klaus Darilion, Head of Operations
nic.at GmbH, Jakob-Haringer-Straße 8/V
5020 Salzburg, Austria
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