If it brings the failed it’s because when it was marked as disabled that node was already in the list, so it will fail and hit the failure route again and move to next node.
The next call of ds_select_dst (in request route) will populate a list without disabled nodes, etc.
To summarize:
- In request route call ds_select_dst() - if it fails, in failed_route call ds_mark_dst() and then ds_next_dst()
Example:
...to keep it easy to understand, let's pretend that dispatcher doesn't load balance and just failsover, let's say you have a ds group of nodes A, B and C...
- INVITE 1 received. ds_select_dst() (the list contains A, B, C). $du=A - INVITE 2 received. ds_select_dst() (the list contains A, B, C). $du=A - A dies. - INVITE 1 in failure route, A is maked as disabled, ds_next_dst() (updated list contains B and C). $du=B - INVITE 3 received, ds_select_dst() (the list contains B, C). $du=B - INVITE 2 in failure route, A is already marked as disabled, ds_next_dst() (updated list contains B and C). $du=B - ...people talk via server B because A failed...
So really you would only send calls that populated the dispather list before dying, after that the next calls wouldn't even try to hit that server.
Can you give some more details on what kind of failover you are trying to achieve?
Joel.
On Sat, Sep 1, 2018 at 11:06 Igor Olhovskiy igorolhovskiy@gmail.com wrote:
Hi! I’ve used ds_select_dst() and ds_next_dst() one after another in failure route. If use in request/failure it’s working ok.
But again, during the failover in my environment dispatcher list can change. And I don’t want to rely on ds_next_dst() cause it can bring me absent node. So, I’ve been thinking of use xavp variable to get data from it, but still can’t get it to work.
Regards, Igor On Sep 1, 2018, 4:33 PM +0200, Joel Serrano joel@textplus.com, wrote:
I think you are confused between:
ds_select_dst() = get a node from the dispatcher group based on weight and priority. Use in request_route.
ds_next_dst() = get the next node from the list previously created with ds_select_dst(). Use this in failure_route.
Give it a try and let us know.
On Sat, Sep 1, 2018 at 00:27 Igor Olhovskiy igorolhovskiy@gmail.com wrote:
Is there any way to select not first destination from ds_select_dst()? Could not find any way to do this...
Regards, Igor On Sep 1, 2018, 12:13 AM +0200, Joel Serrano joel@textplus.com, wrote:
Sorry, hit sent too soon.
I meant ds_next_dst() or ds_next_domain():
https://kamailio.org/docs/modules/5.1.x/modules/ dispatcher.html#idp44172212
On Fri, Aug 31, 2018 at 3:06 PM, Joel Serrano joel@textplus.com wrote:
Try with ds_select_next() in failure_route[]
On Fri, Aug 31, 2018 at 06:17 Igor Olhovskiy igorolhovskiy@gmail.com wrote:
Tried other way round All of this is happening in FAILURE ROUTE.
ds_mark_dst("d"); ds_select_dst("1", "0")
But ds_select_dst still selecting for me gateway already marked with "d" on previous step. Seems, it applying states after packet sent. And any other way I can select new dst from set?
Idea why I'm using ds_select_dst in FAILURE_ROUTE and not ds_next_dst() that during failover timer dispatcher list could change (yes, it could be extensive process) and I want to use most fresh version.
2018-08-31 13:05 GMT+02:00 Igor Olhovskiy igorolhovskiy@gmail.com:
Made a pv_xavp_print() afrer ds_select_dst
Seems both destinations are there.
13(23) INFO: <core> [core/xavp.c:543]: xavp_print_list_content(): +++++ start XAVP list: 0x7f8bfc835288 (level=0) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: _dsctx_ 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 1427193258 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 6 13(23) INFO: <core> [core/xavp.c:571]: xavp_print_list_content(): XAVP value: xavp:0x7f8bfc834ed8 13(23) INFO: <core> [core/xavp.c:543]: xavp_print_list_content(): +++++ start XAVP list: 0x7f8bfc834ed8 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: cnt 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 7279890 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 1 13(23) INFO: <core> [core/xavp.c:555]: xavp_print_list_content(): XAVP value: 2 13(23) INFO: <core> [core/xavp.c:583]: xavp_print_list_content(): ----- end XAVP list: 0x7f8bfc834ed8 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: _dispacher_dst_list_ 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 508490514 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 6 13(23) INFO: <core> [core/xavp.c:571]: xavp_print_list_content(): XAVP value: xavp:0x7f8bfc834d78 13(23) INFO: <core> [core/xavp.c:543]: xavp_print_list_content(): +++++ start XAVP list: 0x7f8bfc834d78 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: grp 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 7056653 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 1 13(23) INFO: <core> [core/xavp.c:555]: xavp_print_list_content(): XAVP value: 1 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: uri 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 8122237 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 2 13(23) INFO: <core> [core/xavp.c:558]: xavp_print_list_content(): XAVP value: sip:172.28.0.12:5060 13(23) INFO: <core> [core/xavp.c:583]: xavp_print_list_content(): ----- end XAVP list: 0x7f8bfc834d78 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: _dispacher_dst_list_ 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 508490514 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 6 13(23) INFO: <core> [core/xavp.c:571]: xavp_print_list_content(): XAVP value: xavp:0x7f8bfc834f80 13(23) INFO: <core> [core/xavp.c:543]: xavp_print_list_content(): +++++ start XAVP list: 0x7f8bfc834f80 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: grp 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 7056653 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 1 13(23) INFO: <core> [core/xavp.c:555]: xavp_print_list_content(): XAVP value: 1 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: uri 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 8122237 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 2 13(23) INFO: <core> [core/xavp.c:558]: xavp_print_list_content(): XAVP value: sip:172.28.0.19:5060 13(23) INFO: <core> [core/xavp.c:583]: xavp_print_list_content(): ----- end XAVP list: 0x7f8bfc834f80 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: _dsctx_ 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 1427193258 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 6 13(23) INFO: <core> [core/xavp.c:571]: xavp_print_list_content(): XAVP value: xavp:0x7f8bfc833db0 13(23) INFO: <core> [core/xavp.c:543]: xavp_print_list_content(): +++++ start XAVP list: 0x7f8bfc833db0 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: cnt 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 7279890 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 1 13(23) INFO: <core> [core/xavp.c:555]: xavp_print_list_content(): XAVP value: 2 13(23) INFO: <core> [core/xavp.c:583]: xavp_print_list_content(): ----- end XAVP list: 0x7f8bfc833db0 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: _dispacher_dst_list_ 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 508490514 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 6 13(23) INFO: <core> [core/xavp.c:571]: xavp_print_list_content(): XAVP value: xavp:0x7f8bfc833b80 13(23) INFO: <core> [core/xavp.c:543]: xavp_print_list_content(): +++++ start XAVP list: 0x7f8bfc833b80 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: grp 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 7056653 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 1 13(23) INFO: <core> [core/xavp.c:555]: xavp_print_list_content(): XAVP value: 1 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: uri 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 8122237 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 2 13(23) INFO: <core> [core/xavp.c:558]: xavp_print_list_content(): XAVP value: sip:172.28.0.19:5060 13(23) INFO: <core> [core/xavp.c:583]: xavp_print_list_content(): ----- end XAVP list: 0x7f8bfc833b80 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: _dispacher_dst_list_ 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 508490514 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 6 13(23) INFO: <core> [core/xavp.c:571]: xavp_print_list_content(): XAVP value: xavp:0x7f8bfc833960 13(23) INFO: <core> [core/xavp.c:543]: xavp_print_list_content(): +++++ start XAVP list: 0x7f8bfc833960 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: grp 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 7056653 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 1 13(23) INFO: <core> [core/xavp.c:555]: xavp_print_list_content(): XAVP value: 1 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: uri 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 8122237 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 2 13(23) INFO: <core> [core/xavp.c:558]: xavp_print_list_content(): XAVP value: sip:172.28.0.12:5060 13(23) INFO: <core> [core/xavp.c:583]: xavp_print_list_content(): ----- end XAVP list: 0x7f8bfc833960 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: _dsctx_ 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 1427193258 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 6 13(23) INFO: <core> [core/xavp.c:571]: xavp_print_list_content(): XAVP value: xavp:0x7f8bfc835670 13(23) INFO: <core> [core/xavp.c:543]: xavp_print_list_content(): +++++ start XAVP list: 0x7f8bfc835670 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: cnt 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 7279890 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 1 13(23) INFO: <core> [core/xavp.c:555]: xavp_print_list_content(): XAVP value: 1 13(23) INFO: <core> [core/xavp.c:583]: xavp_print_list_content(): ----- end XAVP list: 0x7f8bfc835670 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: _dispacher_dst_list_ 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 508490514 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 6 13(23) INFO: <core> [core/xavp.c:571]: xavp_print_list_content(): XAVP value: xavp:0x7f8bfc833580 13(23) INFO: <core> [core/xavp.c:543]: xavp_print_list_content(): +++++ start XAVP list: 0x7f8bfc833580 (level=1) 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: grp 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 7056653 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 1 13(23) INFO: <core> [core/xavp.c:555]: xavp_print_list_content(): XAVP value: 2 13(23) INFO: <core> [core/xavp.c:547]: xavp_print_list_content(): *** XAVP name: uri 13(23) INFO: <core> [core/xavp.c:548]: xavp_print_list_content(): XAVP id: 8122237 13(23) INFO: <core> [core/xavp.c:549]: xavp_print_list_content(): XAVP value type: 2 13(23) INFO: <core> [core/xavp.c:558]: xavp_print_list_content(): XAVP value: sip:172.28.0.46:5060 13(23) INFO: <core> [core/xavp.c:583]: xavp_print_list_content(): ----- end XAVP list: 0x7f8bfc833580 (level=1) 13(23) INFO: <core> [core/xavp.c:583]: xavp_print_list_content(): ----- end XAVP list: 0x7f8bfc835288 (level=0) … call ds_next_dst() here … 13(23) WARNING: dispatcher [dispatch.c:2285]: ds_update_dst(): no xavp uri field in next destination record
2018-08-31 12:33 GMT+02:00 Daniel Tryba d.tryba@pocos.nl:
On Fri, Aug 31, 2018 at 12:11:53PM +0200, Igor Olhovskiy wrote: > Can I somehow dump xavp_dst var to check if ds_select_dst is correct?
You could use pv_xavp_print(): https://www.kamailio.org/docs/modules/5.1.x/modules/pv.html# pv.f.pv_xavp_print
If there is a better way I'd like to know myself.
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-- Best regards, Igor
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