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From "Tim Harper (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MESOS-8171) Using a failoverTimeout of 0 with Mesos native scheduler client can result in infinite subscribe loop
Date Sat, 04 Nov 2017 07:51:00 GMT

    [ https://issues.apache.org/jira/browse/MESOS-8171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16238837#comment-16238837
] 

Tim Harper commented on MESOS-8171:
-----------------------------------

It seems like perhaps an ideal solution would be to ignore 0?

{code}
if ( (duration.isSome()) && (duration.get() > Duration::zero() ) {
  ...
}
{code}

> Using a failoverTimeout of 0 with Mesos native scheduler client can result in infinite
subscribe loop
> -----------------------------------------------------------------------------------------------------
>
>                 Key: MESOS-8171
>                 URL: https://issues.apache.org/jira/browse/MESOS-8171
>             Project: Mesos
>          Issue Type: Bug
>          Components: c++ api, java api, scheduler driver
>    Affects Versions: 1.4.0
>            Reporter: Tim Harper
>            Priority: Minor
>
> Over the past year, the Marathon team has been plagued with an issue that hits our CI
builds periodically in which the scheduler driver enters a tight loop, sending 10,000s of
SUBSCRIBE calls to the master per second. I turned on debug logging for the client and the
server, and it pointed to an issue with the {{doReliableRegistration}} method in sched.cpp.
Here's the logs:
> {code}
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.099815 13397
process.cpp:1383] libprocess is initialized on 127.0.1.1:60957 with 8 worker threads
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.118237 13397
logging.cpp:199] Logging to STDERR
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.128921 13416
sched.cpp:232] Version: 1.4.0
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.151785 13791
group.cpp:341] Group process (zookeeper-group(1)@127.0.1.1:60957) connected to ZooKeeper
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.151823 13791
group.cpp:831] Syncing group operations: queue size (joins, cancels, datas) = (0, 0, 0)
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.151837 13791
group.cpp:419] Trying to create path '/mesos' in ZooKeeper
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.152586 13791
group.cpp:758] Found non-sequence node 'log_replicas' at '/mesos' in ZooKeeper
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.152662 13791
detector.cpp:152] Detected a new leader: (id='0')
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.152762 13791
group.cpp:700] Trying to get '/mesos/json.info_0000000000' in ZooKeeper
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.157148 13791
zookeeper.cpp:262] A new leading master (UPID=master@172.16.10.95:32856) is detected
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.157347 13787
sched.cpp:336] New master detected at master@172.16.10.95:32856
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.157557 13787
sched.cpp:352] No credentials provided. Attempting to register without authentication
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.157565 13787
sched.cpp:836] Sending SUBSCRIBE call to master@172.16.10.95:32856
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.157635 13787
sched.cpp:869] Will retry registration in 0ns if necessary
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.158979 13785
sched.cpp:836] Sending SUBSCRIBE call to master@172.16.10.95:32856
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159029 13785
sched.cpp:869] Will retry registration in 0ns if necessary
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159265 13790
sched.cpp:836] Sending SUBSCRIBE call to master@172.16.10.95:32856
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159303 13790
sched.cpp:869] Will retry registration in 0ns if necessary
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159479 13786
sched.cpp:836] Sending SUBSCRIBE call to master@172.16.10.95:32856
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159521 13786
sched.cpp:869] Will retry registration in 0ns if necessary
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159622 13788
sched.cpp:836] Sending SUBSCRIBE call to master@172.16.10.95:32856
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159658 13788
sched.cpp:869] Will retry registration in 0ns if necessary
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159749 13789
sched.cpp:836] Sending SUBSCRIBE call to master@172.16.10.95:32856
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159785 13789
sched.cpp:869] Will retry registration in 0ns if necessary
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159878 13792
sched.cpp:836] Sending SUBSCRIBE call to master@172.16.10.95:32856
> WARN [05:39:39 EventsIntegrationTest-LocalMarathon-32858] I1104 05:39:39.159916 13792
sched.cpp:869] Will retry registration in 0ns if necessary
> {code}
> In Marathon, when we are running our tests, we set the failoverTimeout to 0 in order
to cause the Mesos master to immediately forget about a framework when it disconnects.
> On line 860 of sched.cpp, the retry-delay is set to 1/10th the failoverTimeout, which
provides the best explanation for why the value is 0:
> {code}
> /Users/tim/src/m8e/mesos/src/sched/sched.cpp
>  818 |   void doReliableRegistration(Duration maxBackoff)
>  819 |   {
> ...
>  851 |     // Bound the maximum backoff by 'REGISTRATION_RETRY_INTERVAL_MAX'.
>  852 |     maxBackoff =
>  853 |       std::min(maxBackoff, scheduler::REGISTRATION_RETRY_INTERVAL_MAX);
>  854 | 
>  855 |     // If failover timeout is present, bound the maximum backoff
>  856 |     // by 1/10th of the failover timeout.
>  857 |     if (framework.has_failover_timeout()) {
>  858 |       Try<Duration> duration = Duration::create(framework.failover_timeout());
>  859 |       if (duration.isSome()) {
>  860 |         maxBackoff = std::min(maxBackoff, duration.get() / 10);
>  861 |       }
>  862 |     }
>  863 | 
>  864 |     // Determine the delay for next attempt by picking a random
>  865 |     // duration between 0 and 'maxBackoff'.
>  866 |     // TODO(vinod): Use random numbers from <random> header.
>  867 |     Duration delay = maxBackoff * ((double) os::random() / RAND_MAX);
>  868 | 
>  869 |     VLOG(1) << "Will retry registration in " << delay << " if
necessary";
>  870 | 
>  871 |     // Backoff.
>  872 |     frameworkRegistrationTimer = process::delay(
>  873 |         delay, self(), &Self::doReliableRegistration, maxBackoff * 2);
>  874 |   }
>  875 | 
> {code}
> Reading through the code, it seems that once this value is 0, it will always be zero,
since backoff is multiplicative (0 * 2 == 0).



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