Endre, could it be due to pending-to-send system message overflow? On Thu, Jan 22, 2015 at 11:45 AM, Johannes Berg <jberg...@gmail.com> wrote:
> Okay, I increased the load further and now I see the same problem again. > It seems to just have gotten a bit better in that it doesn't happen as > fast, but with enough load it happens. > > To re-iterate, I have Akka 2.3.9 on all (8) nodes and > auto-down-unreachable-after = off on all nodes and I don't do any manual > downing anywhere, still the leader log prints this: > > 2015-01-22 10:35:37 +0000 - [INFO] - from Cluster(akka://system) in > system-akka.actor.default-dispatcher-2 > Cluster Node [akka.tcp://system@ip1:port1] - Leader is removing > unreachable node [akka.tcp://system@ip2:port2] > > and the node(s) under load is(are) removed from the cluster (quarantined). > How is this possible? > > On Wednesday, January 21, 2015 at 5:53:06 PM UTC+2, drewhk wrote: >> >> Hi Johannes, >> >> See the milestone here: https://github.com/akka/ >> akka/issues?q=milestone%3A2.3.9+is%3Aclosed >> >> The tickets cross reference the PRs, too, so you can look at the code >> changes. The issue that probably hit you is https://github.com/akka/ >> akka/issues/16623 which manifested as system message delivery errors on >> some systems, but actually was caused by accidentally duplicated internal >> actors (a regression). >> >> -Endre >> >> On Wed, Jan 21, 2015 at 4:47 PM, Johannes Berg <jber...@gmail.com> wrote: >> >>> Upgrading to 2.3.9 does indeed seem to solve my problem. At least I >>> haven't experienced them yet. >>> >>> Now I'm curious what the fixes were, is there somewhere a change summary >>> between versions or where is it listed what bugs have been fixed in which >>> versions? >>> >>> On Wednesday, January 21, 2015 at 11:31:02 AM UTC+2, drewhk wrote: >>>> >>>> Hi Johannes, >>>> >>>> We just released 2.3.9 with important bugfixes. I recommend to update >>>> and see if the problem is still persisting. >>>> >>>> -Endre >>>> >>>> On Wed, Jan 21, 2015 at 10:29 AM, Johannes Berg <jber...@gmail.com> >>>> wrote: >>>> >>>>> Many connections seem to be formed in the case when the node has been >>>>> marked down for unreachability even though it's still alive and it tries >>>>> to >>>>> connect back into the cluster. The removed node prints: >>>>> >>>>> "Address is now gated for 5000 ms, all messages to this address will >>>>> be delivered to dead letters. Reason: The remote system has quarantined >>>>> this system. No further associations to the remote system are possible >>>>> until this system is restarted." >>>>> >>>>> It doesn't seem to close the connections properly even though it opens >>>>> new ones continously. >>>>> >>>>> Anyway that's a separate issue that I'm not that concerned about right >>>>> now, I've now realized I don't want to use automatic downing instead I >>>>> would like to allow nodes to go unreachable and come back to reachable >>>>> even >>>>> if it takes quite some time and manually stopping the process and downing >>>>> the node in case of an actual crash. >>>>> >>>>> Consequently I've put >>>>> >>>>> auto-down-unreachable-after = off >>>>> >>>>> in the config. Now I have the problem that nodes still are removed, >>>>> this is from the leader node log: >>>>> >>>>> 08:50:14.087UTC INFO [system-akka.actor.default-dispatcher-4] >>>>> Cluster(akka://system) - Cluster Node [akka.tcp://system@ip1:port1] - >>>>> Leader is removing unreachable node [akka.tcp://system@ip2:port2] >>>>> >>>>> I can understand my node is marked unreachable beause it's under heavy >>>>> load but I don't understand what could cause it to be removed. I'm not >>>>> doing any manual downing and have the auto-down to off, what else could >>>>> trigger the removal? >>>>> >>>>> Using the akka-cluster script I can see that the node has most other >>>>> nodes marked as unreachable (including the leader) and that it has another >>>>> leader than other nodes. >>>>> >>>>> My test system consists of 8 nodes. >>>>> >>>>> About the unreachability I'm not having long GC pauses and not sending >>>>> large blobs, but I'm sending very many smaller messages as fast as I can. >>>>> If I just hammer it fast enough it will end up unreachable which I can >>>>> except, but I need to get it back to reachable. >>>>> >>>>> On Thursday, December 11, 2014 at 11:22:41 AM UTC+2, Björn Antonsson >>>>> wrote: >>>>>> >>>>>> Hi Johannes, >>>>>> >>>>>> On 9 December 2014 at 15:29:53, Johannes Berg (jber...@gmail.com) >>>>>> wrote: >>>>>> >>>>>> Hi! I'm doing some load tests in our system and getting problems that >>>>>> some of my nodes are marked as unreachable even though the processes are >>>>>> up. I'm seeing it going a few times from reachable to unreachable and >>>>>> back >>>>>> a few times before staying unreachable saying connection gated for 5000ms >>>>>> and staying silently that way. >>>>>> >>>>>> Looking at the connections made to one of the seed nodes I see that I >>>>>> have several hundreds of connections from other nodes except the failing >>>>>> ones. Is this normal? There are several (hundreds) just between two >>>>>> nodes. >>>>>> When are connections formed between cluster nodes and when are they taken >>>>>> down? >>>>>> >>>>>> >>>>>> Several hundred connections between two nodes seems very wrong. There >>>>>> should only be one connection between two nodes that communicate over >>>>>> akka >>>>>> remoting or are part of a cluster. How many nodes do you have in your >>>>>> cluster? >>>>>> >>>>>> If you are using cluster aware routers then there should be one >>>>>> connection between the router node and the rooutee nodes (can be the same >>>>>> connection that is used for the cluster communication). >>>>>> >>>>>> The connections between the nodes don't get torn down, they stay >>>>>> open, but they are reused for all remoting communication between the >>>>>> nodes. >>>>>> >>>>>> Also is there some limit on how many connections a node with default >>>>>> settings will accept? >>>>>> >>>>>> We have auto-down-unreachable-after = 10s set in our config, does >>>>>> this mean if the node is busy and doesn't respond in 10 seconds it >>>>>> becomes >>>>>> unreachable? >>>>>> >>>>>> Is there any reason why it would stay unreachable and not re-try to >>>>>> join the cluster? >>>>>> >>>>>> >>>>>> The auto down, setting is actually just what it says. I the node is >>>>>> considered unreachable for 10 seconds, it will be moved to DOWN and won't >>>>>> be able to come back into the cluster. The different states of the >>>>>> cluster >>>>>> and the settings are explained in the documentation. >>>>>> >>>>>> http://doc.akka.io/docs/akka/2.3.7/common/cluster.html >>>>>> http://doc.akka.io/docs/akka/2.3.7/scala/cluster-usage.html >>>>>> >>>>>> If you are having problems with nodes becoming unreachable then you >>>>>> could check if you are doing one of these things: >>>>>> 1) sending to large blobs as messages, that effectively block out the >>>>>> heart beats going over the same connection >>>>>> 2) having long GC pauses that trigger the failure detector since >>>>>> nodes don't reply to heartbeats >>>>>> >>>>>> B/ >>>>>> >>>>>> We are using Akka 2.3.6 and using cluster aware routers quite much >>>>>> with a lot of remote messages going around. >>>>>> >>>>>> Anyone that can shed some light on this or that can point me at some >>>>>> documentation about these things? >>>>>> -- >>>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/c >>>>>> urrent/additional/faq.html >>>>>> >>>>>>>>>> Search the archives: https://groups.google.com/grou >>>>>> p/akka-user >>>>>> --- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "Akka User List" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to akka-user+...@googlegroups.com. >>>>>> To post to this group, send email to akka...@googlegroups.com. >>>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>>> >>>>>> -- >>>>>> Björn Antonsson >>>>>> Typesafe <http://typesafe.com/> – Reactive Apps on the JVM >>>>>> twitter: @bantonsson <http://twitter.com/#!/bantonsson> >>>>>> >>>>>> -- >>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/c >>>>> urrent/additional/faq.html >>>>> >>>>>>>>>> Search the archives: https://groups.google.com/grou >>>>> p/akka-user >>>>> --- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Akka User List" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to akka-user+...@googlegroups.com. >>>>> To post to this group, send email to akka...@googlegroups.com. >>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> >>>> -- >>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/ >>> current/additional/faq.html >>> >>>>>>>>>> Search the archives: https://groups.google.com/ >>> group/akka-user >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "Akka User List" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to akka-user+...@googlegroups.com. >>> To post to this group, send email to akka...@googlegroups.com. >>> Visit this group at http://groups.google.com/group/akka-user. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- > >>>>>>>>>> Read the docs: http://akka.io/docs/ > >>>>>>>>>> Check the FAQ: > http://doc.akka.io/docs/akka/current/additional/faq.html > >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user > --- > You received this message because you are subscribed to the Google Groups > "Akka User List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to akka-user+unsubscr...@googlegroups.com. > To post to this group, send email to akka-user@googlegroups.com. > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > -- Cheers, √ -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. 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