Shard Allocation

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.

CPUClusterDisk Watermark

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Investigation and Resolution of Elasticsearch node_concurrent_recoveries Performance Issue

Architect

May 15, 2020 · Databases

Understanding Elasticsearch Architecture: Segments, Translog, Refresh, Shard Allocation and Cluster Operations

This article provides a comprehensive overview of Elasticsearch's internal architecture, explaining how data flows from memory buffers to Lucene segments, the role of refresh and translog for durability, segment merging strategies, shard routing, replica consistency, allocation controls, hot‑cold data separation, and cluster discovery settings.

ElasticsearchIndexingSegments

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Understanding Elasticsearch Architecture: Segments, Translog, Refresh, Shard Allocation and Cluster Operations