Training Slides: 252 - Monitoring & Troubleshooting
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Learn in the next 57min about Tungsten Replicator monitoring and troubleshooting, including an overview of some common issues, triggers, failures (and how to deal with them) as well as some tips & tricks on monitoring. TOPICS COVERED - Discuss Monitoring & Troubleshooting - Review Common Issues - Triggers - Finding and Understanding Log Files - Handling (And Recovering From) Failures - Skipping Transactions - Resetting Scripts for Monitoring - Scripts for Monitoring
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AGENDA
v6 Patch Releases
v7 Release
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New Feature overview
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Coming Soon
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Matthew Lang - Director of Customer Success at Continuent - has over 25 years of experience in database administration, database programming, and system architecture, including the creation of a database replication product that is still in use today. He has designed highly available, scalable systems that have allowed startups to quickly become enterprise organizations, utilizing a variety of technologies including open source projects, virtualization and cloud.
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Continuent Tungsten: Global Clustering
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AGENDA
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Training Slides: 252 - Monitoring & Troubleshooting
- 1. The MySQL Availability Company Tungsten Replicator Master Class Intermediate: Replicator Monitoring & Troubleshooting Chris Parker, Customer Success Director, EMEA & APAC
- 2. Topics In this short course, we will • Discuss Monitoring & Troubleshooting • Review Common Issues • Triggers • Finding and understanding Log Files • Handling (and recovering from) Failures • Skipping Transactions • Resetting • Scripts for Monitoring
- 3. Most Common Issues Common Incidents: • Network Failures • Disk Capacity • OOM • MySQL Crashes • MySQL Max Connections • Human Error • Deletion of THL • Incorrect Shutdown Procedures • Writing direct to a replica Things to check: • Set up Monitoring / Alerts • Check status outputs • Check Log Files • Check OS • Check MySQL state
- 4. Triggers • Triggers are an issue in all MySQL<>MySQL replication topologies • The combination of the binlog_format (ROW vs MIXED) and the TRIGGER type (DETERMINISTIC vs NONDETERMINISTIC) will result in triggers behaving differently. • Either: • Avoid Triggers altogether if possible, or • Code Triggers to intelligently fire ONLY on Primary hosts • Read the docs for a full explanation: • https://docs.continuent.com/tungsten-clustering-6.1/troubleshooting-known-issues- triggers.html
- 5. Log Files • /opt/continuent/service_logs/ • trepsvc.log for complete replicator log • Use logrotate to manage • `replicator dump` • Dumps memory stack to log file • Can be useful in support cases • Automatically issued by `tpm diag`
- 6. Recovering from Failures • Enable auto-recovery properties • Review log files to understand errors • Simply try restarting replicator – YES this sometimes works! • Which node is experiencing an error? • If statement clash, is skipping safe? • If database crashed, have you lost binary logs? • Have you lost THL Files? • Worse case – Reset and Re-provision
- 7. Monitoring Scripts • Nagios-compatible scripts are located in • These scripts will only check the local host. They do not check other hosts. • check_tungsten_online – report ok if all services are online • check_tungsten_services –r – report ok if replicator services are healthy • check_tungsten_latency – used for Nagios style warning and critical replicator latency thresholds • Write your own! - New API coming in v7 $CONTINUENT_ROOT/tungsten/cluster-home/bin/check_tungsten_*
- 8. Summary What we have learnt today • Reviewed Common Issues • Discussed Triggers • Looked at Log Files • Discussed Failures • Skipping Transactions • Resetting • Reviewed Scripts for Monitoring
- 9. Next Steps In the next session we will • Explore Filtering!
- 10. THANK YOU FOR LISTENING continuent.com The MySQL Availability Company Chris Parker, Customer Success Director, EMEA & APAC