Runbook

Elasticsearch replica data synchronization delay

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Overview

This incident type refers to a delay in the synchronization of replica data in an Elasticsearch cluster. Elasticsearch is a search engine that allows for real-time search and analysis of data. In a cluster, data is distributed across multiple nodes to improve performance and ensure high availability. Replica data is a copy of the primary data that is stored on a different node in the cluster. The delay in synchronization of replica data can cause inconsistencies in the search results and affect the performance of the cluster. This issue can occur due to various reasons such as network latency, hardware failure, or software bugs.

Parameters

Debug

Check Elasticsearch cluster health status

List all Elasticsearch nodes in the cluster

Check the status of Elasticsearch indices

Check the number of replicas for each Elasticsearch index

Check the status of Elasticsearch replicas for a specific index

Check the status of Elasticsearch shards for a specific index

Check the disk usage of Elasticsearch nodes

Check the network latency between Elasticsearch nodes

Check the disk usage of Elasticsearch nodes

Check the CPU usage of Elasticsearch nodes

If the replica shard synchronization is stuck, try to force a sync or reset the replica shard.

Repair

Optimize Elasticsearch configuration: Elasticsearch configuration can be optimized for better performance. This includes settings like thread pools, heap size, and shard allocation. Optimizing these settings can help improve the speed of data synchronization.

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