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46 commits

Author SHA1 Message Date
Quanah Gibson-Mount
efaf9a4a17 Happy New Year! 2021-01-11 19:25:53 +00:00
Ondřej Kuzník
1f6d8611a3 Implement read throttling when writes backlog 
Reject operations in such a case with LDAP_BUSY. If read_event feature
is on, just stop reading from the connection. However this could still
result in deadlocks in reasonable situations. Need to figure out better
ways to make it safe and still protect ourselves.
 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
62a806b243 Thread error checking 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
dc1961cb15 Epoch based memory reclamation 
Similar to the algorithm presented in
https://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-579.pdf

Not completely lock-free at the moment. Also the problems with epoch
based memory reclamation are still present - a thread actively observing
an epoch getting stuck will prevent LloadConnections and LloadOperations
being freed, potentially running out of memory.
 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
9444dfc991 Simplify pause handling 
Gets rid of a race where unpause+pause fired in a quick succession would
miss the event_base_loopbreak() call.
 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
3bd2d7483e Reuse connection_walk for client matters 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
b4f43ed8e1 Refactor backend reset 
Reuse the connection walking facility in timeout management.
 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
638f8a2cbc Tighten checks on retry management 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
2a813cb06d Clean up backend_retry and its callers. 2020-11-17 17:58:15 +00:00
Nadezhda Ivanova
f4a2fdd400 Fix a new backend not being operational if added via cn=config 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
00806dd32a libevent 2.0 support 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
bd7a6f67de Introduce lload_open_new_listener 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
757c8beda7 Switch to ldap_parse_url_ext 
This simplifies port parsing in the end. Also pass the url to
ldap_open_listener in anticipation of incremental listener config.
 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
db3961f489 Record connect task to allow canceling it 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
b039e7c1b0 Keep a reference around for the bind task 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
0314f95d7f Work around libevent base not waking up on shutdown 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
07401e5829 Implement runtime monitor (un)registration 
Unregistration is a hack and we shoould either make the subsystems into
an entry (if monitor allows subentry generation) or implement subsystem
unregistration in back-monitor.
 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
b1c098ad76 Module shutdown support 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
362f16479a Deal with no backends being configured 2020-11-17 17:58:14 +00:00
Nadezhda Ivanova
bace795984 Enable dynamic configuration 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
cfe9065824 Introduce infra to handle config changes 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
bf9f99dd88 Split backend destruction from resetting it 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
485a169758 Implement pause handlers 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
22818e8583 Module shutdown 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
dab9054794 Rework monitor startup 
Takes care of dealing with monitor not present/not configured and fix a
monitor startup issue.
 2020-11-17 17:58:14 +00:00
Nadezhda Ivanova
678fa100f7 Convert the load balancer into a backend 2020-11-17 17:58:14 +00:00
Nadezhda Ivanova
2d33032504 Lload cn=monitor initial implementation 2020-11-17 17:58:14 +00:00
Nadezhda Ivanova
8bc7650a7c Clean ups and renames to coexist with slapd 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
aecc62c08e Introduce operation timeout machinery 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
b4d7e8af8d We should just be able to call backend_retry 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
5fcef01d62 Switch from a global mutex 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
65def94380 More logging improvements 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
1740f36bfc Fix emfile handling 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
05f2ac2583 Unify logging output 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
6ee21f1181 Split bind configuration from backends 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
3f5dee0b79 Keep a list of active clients for shutdown purposes. 
Potentially for timeout detection purposes in the future.
 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
d020897f5b Initialise listeners after all workers have been 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
53015aa4cb Round robin for backends. 
Several threads calling backend_select might reset current_backend to a
different place, there are two options to deal with that:
- just let the last rotation win (the current approach)
- detect whether first == current_backend and only replace then

Not sure which one is more useful, going with the simpler.
 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
58a880bc7b Convert backend and upstream management to use CIRCLEQ. 
This alone doesn't make the server do a round robin.
 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
9d66c26be5 Operation reference counting 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
ea7e40b8e7 Shutdown handling 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
8b1703d2a7 Implement backend retry timeouts 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
673513a017 Maintain the configured amount of connections per backend 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
79f7e79f15 Set up connections in the worker threads 2020-11-17 17:15:40 +00:00
Ondřej Kuzník
8e0a6119fa Startup adjustment 2020-11-17 17:15:40 +00:00
Ondřej Kuzník
46ddb4039c lloadd ahoy 2020-11-17 17:15:40 +00:00