Thanks Vinod for your reply ! On investigating the issue a bit more deeper, I have noticed that Chronos thread is blocked on Zookeeper. Chronos is using zookeeper client available in Mesos native library. I am investigating why zk client is still waiting for response while ZK stats/mntr don't show any request in its queue.
Have you seen such a scenario before ? What more info would be required to investigate Mesos lib's zk client ? BTW, I have registered GitHub issue with Chronos team as well: https://github.com/mesos/chronos/issues/897 More details are available there. Thanks, Harjinder On Wed, Dec 25, 2019 at 9:18 PM Vinod Kone <vinodk...@gmail.com> wrote: > The suggested info would be needed to triage this. > > Thanks, > Vinod > > On Dec 24, 2019, at 11:32 PM, Harjinder Singh Mistry < > harjindersing...@flipkart.com> wrote: > > > We have been encountering an *intermittent* issue where Chronos stops > getting > resource offers from Mesos master and the scheduled jobs get stuck in > 'Queued' > state at Chronos. > > The sequence of observed events is as follows: > 1. Chronos jobs are not executed by Mesos and status of jobs on Chronos > dashboard is ‘Queued’. > 2. Mesos master dashboard no longer shows agents i.e. slaves. > 3. Mesos master logs show that master has not been sending resource offers > to > framework i.e. Chronos. But master keeps getting update from slaves for > old > tasks. > 4. Zookeeper and slaves are not down. They are working fine. > 5. After restarting Zookeeper, the system starts working fine. Chronos jobs > start getting executed. > > Please suggest a solution if this problem is known. > > Can you please help us with the steps/info required for investigation ? We > plan > to collect following when the issue happens next time: > > 1. Logs from Chronos, Mesos Master, Mesos Slaves and Zookeeper nodes. > 2. Check Mesos UI: http://mesos-master:5050 and see if any agents are > listed > and note status of jobs. > 3. Hit the endpoint http://mesos-master:5050/state and save its output. > 4. Check if Mesos masters and Zookeeper nodes are reachable (i.e. ping) > from > Mesos slaves. > 5. From output of step 3, determine the leader in Mesos master and check > if is > sending offers: tail -f /var/log/mesos-log/mesos-master.INFO | grep -i > sending > > Thanks, > Harjinder > > > > *-----------------------------------------------------------------------------------------* > > *This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they are > addressed. If you have received this email in error, please notify the > system manager. This message contains confidential information and is > intended only for the individual named. If you are not the named addressee, > you should not disseminate, distribute or copy this email. Please notify > the sender immediately by email if you have received this email by mistake > and delete this email from your system. 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