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xrootd: reduce number of DNS requests - #8281
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Motivation: DNS servers might be unresponsive. Thus, if dCache tries to resolve the IP addresses or query DNS for reverse lookup, then it performance depends on DNS latency. Modification: Update xrootd door and mover to use unresolved InetSocketAddress for pool selection or redirect. The reverse lookup of door IPs is kept as is, but a door doesn't change its IP very often; thus internal Java caching mitigates the impact. Result: less dependency on DNS latency. Fixes: #8241 Acked-by: Lennart Sack Target: master, 12.0, 11.2 Require-book: no Require-notes: yes (cherry picked from commit 2398041) Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
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Motivation:
DNS servers might be unresponsive. Thus, if dCache tries to resolve the IP addresses or query DNS for reverse lookup, then it performance depends on DNS latency.
Modification:
Update xrootd door and mover to use unresolved InetSocketAddress for pool selection or redirect.
The reverse lookup of door IPs is kept as is, but a door doesn't change its IP very often; thus internal Java caching mitigates the impact.
Result:
less dependency on DNS latency.
Fixes: #8241
Acked-by: Lennart Sack
Target: master, 12.0, 11.2
Require-book: no
Require-notes: yes
(cherry picked from commit 2398041)