Runbook

Elasticsearch Slow Index Flushing

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Overview

When the Elasticsearch cluster takes too much time to flush indices to disk, it can cause performance issues. This means that data may not be written to disk as quickly as expected, which can lead to slow queries and other problems. This type of incident can be caused by a variety of factors, including hardware issues, network latency, or misconfiguration. It is important to monitor Elasticsearch closely to ensure that indices are being flushed to disk in a timely manner.

Parameters

Debug

Check if Elasticsearch is running

Check Elasticsearch logs for any errors

Check the Elasticsearch cluster health

Check if Elasticsearch indices are being flushed to disk

Check total number of index flushed to disk

Retrieve flush total time from elasticsearch cluster.

Check Elasticsearch node status

Check Elasticsearch segment count

Check Elasticsearch segment sizes

Check if Elasticsearch is using too much memory

Repair

Optimize the Elasticsearch configuration for better performance by adjusting refresh interval.

Learn more

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