Troubleshooting your Elasticsearch cluster like a Support Engineer
summary
Shows exact troubleshooting steps: run the diagnostic tool to capture APIs, logs and monitoring; use the allocation explain API to find an unassigned primary shard and a breached high watermark (e.g. 20.1GB used of 21GB, 90% threshold). Remediations: add nodes or disk, delete data, change transient cluster.settings and clear index read blocks, or restore from snapshots. For hot CPU on one node, change index template to increase number_of_shards (1→3), benchmark and monitor to confirm it fixes the load.
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chapters (33)
- 0:00Introduction
- 2:22Emergency room analogy
- 2:47Tools
- 3:43Diagnostics
- 4:55Sirens
- 5:31Steps
- 6:17What do we do
- 8:27Urgent
- 10:55Diagnostic
- 15:27Diagnosis
- 17:53Root cause analysis
- 19:45Examples
- 20:05Red Cluster
- 21:47Support Diagnostics
- 25:20How did it get ready
- 26:47Cluster API
- 27:13High Watermark
- 28:04Changing the allocation limit
- 28:36Watermarks
- 29:00Index read blocks
- 30:36Add nodes
- 31:19Transient cluster settings
- 32:26Using the API
- 32:52Backups
- 34:49Monitoring
- 36:51CPU Usage
- 39:50Monitoring UI
- 42:20Checking CPU usage by Thread
- 42:51Adding more shards
- 44:32Index template
- 45:42Index settings
- 50:58Putting it all together
- 52:02Helpful tips
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