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. If you are not the intended recipient, you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.***** **** *Any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the organization. Any information on shares, debentures or similar instruments, recommended product pricing, valuations and the like are for information purposes only. It is not meant to be an instruction or recommendation, as the case may be, to buy or to sell securities, products, services nor an offer to buy or sell securities, products or services unless specifically stated to be so on behalf of the Flipkart group. Employees of the Flipkart group of companies are expressly required not to make defamatory statements and not to infringe or authorise any infringement of copyright or any other legal right by email communications. Any such communication is contrary to organizational policy and outside the scope of the employment of the individual concerned. The organization will not accept any liability in respect of such communication, and the employee responsible will be personally liable for any damages or other liability arising.***** **** *Our organization accepts no liability for the content of this email, or for the consequences of any actions taken on the basis of the information *provided,* unless that information is subsequently confirmed in writing. If you are not the intended recipient, you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.* _-----------------------------------------------------------------------------------------_
