Reducing requested field data cache size of to the maximum allowed size of – How to solve related issues

Reducing requested field data cache size of to the maximum allowed size of – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

 

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Reducing requested field data cache size of to the maximum allowed size of ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: cache, fielddata and indices.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log “reducing requested field data cache size of [{}] to the maximum allowed size of [{}]” classname is IndicesFieldDataCache.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         super(settings);
        this.indicesFieldDataCacheListener = indicesFieldDataCacheListener;
        String size = componentSettings.get("size"; "-1");
        long sizeInBytes = componentSettings.getAsMemory("size"; "-1").bytes();
        if (sizeInBytes > ByteSizeValue.MAX_GUAVA_CACHE_SIZE.bytes()) {
            logger.warn("reducing requested field data cache size of [{}] to the maximum allowed size of [{}]"; new ByteSizeValue(sizeInBytes);
                    ByteSizeValue.MAX_GUAVA_CACHE_SIZE);
            sizeInBytes = ByteSizeValue.MAX_GUAVA_CACHE_SIZE.bytes();
            size = ByteSizeValue.MAX_GUAVA_CACHE_SIZE.toString();
        }
        final TimeValue expire = componentSettings.getAsTime("expire"; null);




 

Run the Check-Up to get customized recommendations like this:

checklist Run Check-Up

error

Heavy merges detected in specific nodes

error-img

Description

A large number of small shards can slow down searches and cause cluster instability. Some indices have shards that are too small…

error-img

Recommendations Based on your specific ES deployment you should…

Based on your specific ES deployment you should…

1

X-PUT curl -H [a customized code snippet to resolve the issue]

 

 

 

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