On Fri, Jan 29, 2021 at 9:18 AM Schoonjans, Tom (RFI,RAL,-) < Tom.Schoonjans@xxxxxxxxx> wrote: > Hi Yuval, > > > What do I need to do if I want to switch to using a different exchange on > the RabbitMQ endpoint? Or change the amqp-ack-level option that was used? > Would you expect the same problem again? Will the existing connections to > the RabbitMQ server be cleanly terminated? > > I think that changing the ack level would take effect on the next publish (as this is not a feature of the connection, but the calling code), but to change the exchange (or any other parameter of the connection itself), or even creating a new topic to the same endpoint with a different exchange, you would need a restart :-( (tracking this here: https://tracker.ceph.com/issues/46127) > I tried the topic example > <https://www.rabbitmq.com/tutorials/tutorial-five-python.html> from the > RabbitMQ tutorial and I actually got the same behaviour as with Ceph: > messages sent before the consumer queue is attached are lost. From what I > understand this is a *feature* of this type of exchange. See also this > <https://stackoverflow.com/questions/6148381/rabbitmq-persistent-message-with-topic-exchange> stackoverflow > post. > > this is interesting. and looks like a better model than what we currently have. we should declare our own fanout "gateway" exchange, connected to an "eat all" queue. the users may then connect the consumers directly to it, or via a topic exchange they declare. that would actually fix 2 issues: - durability of messages before clients are connected - exchange name configuration issues > Best, > > Tom > > > Dr Tom Schoonjans > > Research Software Engineer - HPC and Cloud > > Rosalind Franklin Institute > Harwell Science & Innovation Campus > Didcot > Oxfordshire > OX11 0FA > United Kingdom > > https://www.rfi.ac.uk > > The Rosalind Franklin Institute is a registered charity in England and > Wales, No. 1179810 Company Limited by Guarantee Registered in England > and Wales, No.11266143. Funded by UK Research and Innovation through > the Engineering and Physical Sciences Research Council. > > On 28 Jan 2021, at 18:16, Yuval Lifshitz <ylifshit@xxxxxxxxxx> wrote: > > > > On Thu, Jan 28, 2021 at 7:34 PM Schoonjans, Tom (RFI,RAL,-) < > Tom.Schoonjans@xxxxxxxxx> wrote: > >> Hi Yuval, >> >> >> Together with Tom Byrne I ran some more tests today while keeping an eye >> on the logs as well. >> >> We immediately noticed that the nodes were logging errors when uploading >> files like: >> >> 2021-01-28 16:10:45.825 7f56ff5cf700 1 ====== starting new request req=0x7f56ff5c87f0 ===== >> 2021-01-28 16:10:45.828 7f5721e14700 1 AMQP connect: exchange mismatch >> 2021-01-28 16:10:45.828 7f5721e14700 1 ERROR: failed to create push endpoint: amqp://<username>:<password>@<my.rabbitmq.server>:5672 due to: pubsub endpoint configuration error: AMQP: failed to create connection to: amqp://<username>:<password>@<my.rabbitmq.server>:5672 >> 2021-01-28 16:10:45.828 7f571ee0e700 1 ====== req done req=0x7f571ee077f0 op status=0 http_status=200 latency=0.0569997s ====== >> >> >> Which resulted in no connections being established to the RabbitMQ server. >> >> Tom restarted then the Ceph services on one gateway node, which led to >> events being sent to RabbitMQ without blocking, but only if this particular >> node was picked up by the boto3 upload request in the round-robin DNS. >> >> Restarting the Ceph service on all nodes fixed the problem and I got a >> nice steady stream of events to my consumer Python script! >> >> > we should fix it. no restart should be needed if one of the connection > parameters was wrong > > > >> I did notice that any events that were sent while my consumer script was >> not running are lost, as they are not picked up after I restart the script. >> Any thoughts on this? >> >> > this is strange. in our code [1] we don't require immediate transfer of > messages. > how is the exchange declared? > can you check if this is happening when you send messages from a python > producer as well? > > [1] https://github.com/ceph/ceph/blob/master/src/rgw/rgw_amqp.cc#L575 > > > >> Many thanks!! >> >> Best, >> >> Tom >> >> >> >> Dr Tom Schoonjans >> >> Research Software Engineer - HPC and Cloud >> >> Rosalind Franklin Institute >> Harwell Science & Innovation Campus >> Didcot >> Oxfordshire >> OX11 0FA >> United Kingdom >> >> https://www.rfi.ac.uk >> >> The Rosalind Franklin Institute is a registered charity in England and >> Wales, No. 1179810 Company Limited by Guarantee Registered in England >> and Wales, No.11266143. Funded by UK Research and Innovation through >> the Engineering and Physical Sciences Research Council. >> >> On 27 Jan 2021, at 16:21, Yuval Lifshitz <ylifshit@xxxxxxxxxx> wrote: >> >> >> On Wed, Jan 27, 2021 at 5:34 PM Schoonjans, Tom (RFI,RAL,-) < >> Tom.Schoonjans@xxxxxxxxx> wrote: >> >>> Looks like there’s already a ticket open for AMQP SSL support: >>> https://tracker.ceph.com/issues/42902 (you opened it ;-)) >>> >>> I will give a try myself if I have some time, but don’t hold your breath >>> with lockdown and home schooling. Also I am not much of a C++ coder. >>> >>> I need to go over the logs with Tom Byrne to see why it is not working >>> properly. And perhaps I will be able to come up with a fix then. >>> >>> However this is what I have run into so far today: >>> >>> 1. After configuring a bucket with a topic using the non-SSL port, I >>> tried a couple of uploads to this bucket. They all hanged, which seemed >>> like something was very wrong, so I Ctrl-C’ed every time. After some time I >>> figured out from the RabbitMQ admin UI that Ceph was indeed connecting to >>> it, and the connections remained so I killed them from the UI. >>> >> >> sending the notification to the rabbitmq server is synchronous with the >> upload to the bucket. so, if the server is slow or not acking the >> notification, the upload request would hang. not that the upload itself is >> done first, but the reply to the client does not happen until rabbitmq >> server acks. >> >> would be great if you can share the radosgw logs. >> maybe the issue is related to the user/password method we use? we use: >> AMQP_SASL_METHOD_PLAIN >> >> one possible workaround would be to set "amqp-ack-level" to "none". in >> this case the radosgw does not wait for an ack >> >> in "pacific" you could use "persistent topics" where the notifications >> are sent asynchronously to the endpoint. >> >> 2. I then wrote a python script with Pika to consume the events, hoping >>> that would stop the blocking. I had some minor success with this. Usually >>> the first three or four uploaded files would generate events that I could >>> consume with my script. >>> >> >> the radosgw is waiting for an ack from the broker, not the end consumer, >> so this should not have mattered... >> did you actually see any notifications delivered to the consumer? >> >> >>> However, the rest would block for ever. I repeated this a couple of >>> times but always the same result. I noticed that after I stopped uploading, >>> removed the bucket and the topic, the connection from Ceph in the RabbitMQ >>> UI remained. I killed it but it came back seconds later from another port >>> on the Ceph cluster. I ended up playing whack-a-mole with this until no >>> more connections would be established from Ceph to RabbitMQ. I probably >>> killed a 100 or so of them. >>> >> >> once you remove the bucket there cannot be new notification sent. if you >> create the bucket again you may see notifications again (this is fixed in >> "pacific"). >> either way, even if the connection to the rabbitmq server would still be >> open, but no new notifications should be sent there. just having the >> connection should not be an issue but would be nice to fix that as well: >> https://tracker.ceph.com/issues/49033 >> >> 3. After this I couldn’t get any events sent anymore. There is no more >>> blocking when uploading, files get written but nothing else happens. No >>> connections are made anymore from Ceph to RabbitMQ. >>> >>> Hope this helps… >>> >> >> yes, this is very helpful! >> >> >>> Best, >>> >>> Tom >>> >>> >>> >>> >>> Dr Tom Schoonjans >>> >>> Research Software Engineer - HPC and Cloud >>> >>> Rosalind Franklin Institute >>> Harwell Science & Innovation Campus >>> Didcot >>> Oxfordshire >>> OX11 0FA >>> United Kingdom >>> >>> https://www.rfi.ac.uk >>> >>> The Rosalind Franklin Institute is a registered charity in England and >>> Wales, No. 1179810 Company Limited by Guarantee Registered in England >>> and Wales, No.11266143. Funded by UK Research and Innovation through >>> the Engineering and Physical Sciences Research Council. >>> >>> On 27 Jan 2021, at 13:04, Yuval Lifshitz <ylifshit@xxxxxxxxxx> wrote: >>> >>> >>> >>> On Wed, Jan 27, 2021 at 11:33 AM Schoonjans, Tom (RFI,RAL,-) < >>> Tom.Schoonjans@xxxxxxxxx> wrote: >>> >>>> Hi Yuval, >>>> >>>> >>>> Switching to non-SSL connections to RabbitMQ allowed us to get things >>>> working, although currently it’s not very reliable. >>>> >>> >>> can you please add more about that? what reliability issues did you see? >>> >>> >>>> I will open a new ticket over this if we can’t fix things ourselves. >>>> >>>> >>> this would be great. we have ssl support for kafka and http endpoint, >>> so, if you decide to give it a try you can look at them as examples. >>> and let me know if you have questions or need help. >>> >>> >>> >>>> I will open an issue on the tracker as soon as my account request has >>>> been approved :-) >>>> >>>> Best, >>>> >>>> Tom >>>> >>>> >>>> >>>> >>>> >>>> Dr Tom Schoonjans >>>> >>>> Research Software Engineer - HPC and Cloud >>>> >>>> Rosalind Franklin Institute >>>> Harwell Science & Innovation Campus >>>> Didcot >>>> Oxfordshire >>>> OX11 0FA >>>> United Kingdom >>>> >>>> https://www.rfi.ac.uk >>>> >>>> The Rosalind Franklin Institute is a registered charity in England and >>>> Wales, No. 1179810 Company Limited by Guarantee Registered in England >>>> and Wales, No.11266143. Funded by UK Research and Innovation through >>>> the Engineering and Physical Sciences Research Council. >>>> >>>> On 26 Jan 2021, at 20:02, Yuval Lifshitz <ylifshit@xxxxxxxxxx> wrote: >>>> >>>> >>>> >>>> On Tue, Jan 26, 2021 at 9:48 PM Schoonjans, Tom (RFI,RAL,-) < >>>> Tom.Schoonjans@xxxxxxxxx> wrote: >>>> >>>>> Hi Yuval, >>>>> >>>>> >>>>> I worked on this earlier today with Tom Byrne and I think I may be >>>>> able to provide some more information. >>>>> >>>>> I set up the RabbitMQ server myself, and created the exchange with >>>>> type ’topic’ before configuring the bucket. >>>>> >>>>> Not sure if this matters, but the RabbitMQ endpoint is reached over >>>>> SSL, using certificates generated with Letsencrypt. >>>>> >>>>> >>>> it actually does. we don't support amqp over ssl. >>>> feel free to open a tracker for that - as we should probably support >>>> that! >>>> but note that it would probably be backported only to later versions >>>> than nautilus. >>>> >>>> >>>> >>>>> Many thanks, >>>>> >>>>> Tom >>>>> >>>>> >>>>> >>>>> Dr Tom Schoonjans >>>>> >>>>> Research Software Engineer - HPC and Cloud >>>>> >>>>> Rosalind Franklin Institute >>>>> Harwell Science & Innovation Campus >>>>> Didcot >>>>> Oxfordshire >>>>> OX11 0FA >>>>> United Kingdom >>>>> >>>>> https://www.rfi.ac.uk >>>>> >>>>> The Rosalind Franklin Institute is a registered charity in England and >>>>> Wales, No. 1179810 Company Limited by Guarantee Registered in England >>>>> and Wales, No.11266143. Funded by UK Research and Innovation through >>>>> the Engineering and Physical Sciences Research Council. >>>>> >>>>> On 26 Jan 2021, at 19:37, Yuval Lifshitz <ylifshit@xxxxxxxxxx> wrote: >>>>> >>>>> Hi Tom, >>>>> Did you create the exchange in rabbitmq? The RGW does not create it >>>>> and assume it is already created? >>>>> Could you increase the log level in RGW and see if there are more log >>>>> messages that have "AMQP" in them? >>>>> >>>>> Thanks, >>>>> >>>>> Yuval >>>>> >>>>> On Tue, Jan 26, 2021 at 7:33 PM Byrne, Thomas (STFC,RAL,SC) < >>>>> tom.byrne@xxxxxxxxxx> wrote: >>>>> >>>>>> Hi all, >>>>>> >>>>>> We've been trying to get RGW Bucket notifications working with a >>>>>> RabbitMQ endpoint on our Nautilus 14.2.15 cluster. The gateway host can >>>>>> communicate with the rabbitMQ server just fine, but when RGW tries to send >>>>>> a message to the endpoint, the message never appears in the queue, and we >>>>>> get this error from in the RGW logs: >>>>>> >>>>>> 2021-01-26 16:28:17.271 7f0468b1f700 1 push to endpoint AMQP(0.9.1) >>>>>> Endpoint >>>>>> URI: amqp://user:pass@host:5671 >>>>>> Topic: ceph-topic-test >>>>>> Exchange: ceph-test >>>>>> Ack Level: broker failed, with error: -4098 >>>>>> >>>>>> We've confirmed the URI is correct, and that the gateway host can >>>>>> send messages to the RabbitMQ via a standalone script (using the same >>>>>> information as in the URI). Does anyone have any hints about how to dig >>>>>> into this? >>>>>> >>>>>> Cheers, >>>>>> Tom >>>>>> >>>>>> This email and any attachments are intended solely for the use of the >>>>>> named recipients. 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