Tagged articles

disk watermark

3 articles · Page 1 of 1

Jan 20, 2026 · Databases

Why Is Your Elasticsearch Cluster Yellow? 5 Causes & Fixes for Unassigned Replicas

This guide walks through a systematic troubleshooting process for Elasticsearch yellow cluster status, covering how to diagnose unassigned replica shards using cluster health, shard allocation, and allocation explain APIs, then resolves the five most common causes: insufficient nodes, disk watermarks, disabled allocation, node failures, and oversized shards, with commands for both curl and Kibana Dev Tools.

Cluster OperationsElasticsearchTroubleshooting

0 likes · 13 min read

Why Is Your Elasticsearch Cluster Yellow? 5 Causes & Fixes for Unassigned Replicas

Programmer1970

Jan 9, 2025 · Operations

Understanding Elasticsearch Disk Watermarks in 3 Minutes

The article explains Elasticsearch's disk watermark mechanism—low, high, and flood stage thresholds—detailing why they are crucial for preventing data loss and maintaining cluster stability, how they work, how to configure them in elasticsearch.yml, and best‑practice recommendations for monitoring and storage planning.

Best PracticesConfigurationElasticsearch

0 likes · 5 min read

Understanding Elasticsearch Disk Watermarks in 3 Minutes

vivo Internet Technology

Nov 22, 2023 · Operations

Investigation and Resolution of Elasticsearch node_concurrent_recoveries Performance Issue

The team traced read‑request timeouts to a single overloaded Elasticsearch node where an excessively high node_concurrent_recoveries setting caused many simultaneous shard recoveries and disk‑watermark‑driven relocations, and resolved the issue by lowering concurrent recoveries, enabling adaptive replica selection, and adjusting allocation settings.

CPUClusterElasticsearch

0 likes · 16 min read

Investigation and Resolution of Elasticsearch node_concurrent_recoveries Performance Issue