Requested thread pool size for is too large; setting to maximum instead – How To Solve Related Issues

Requested thread pool size for is too large; setting to maximum instead – How To Solve Related Issues

Opster Team

Feb-20, Version: 1.7-8.0

 

Before you begin reading this guide, we recommend you try running the 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 ” Requested thread pool size for is too large; setting to maximum instead ” 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: pool, thread and threadpool.

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 “requested thread pool size [{}] for [{}] is too large; setting to maximum [{}] instead” classname is ThreadPool.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         if ((name.equals(Names.BULK) || name.equals(Names.INDEX)) && size > availableProcessors) {
            // We use a hard max size for the indexing pools; because if too many threads enter Lucene's IndexWriter; it means
            // too many segments written; too frequently; too much merging; etc:
            // TODO: I would love to be loud here (throw an exception if you ask for a too-big size); but I think this is dangerous
            // because on upgrade this setting could be in cluster state and hard for the user to correct?
            logger.warn("requested thread pool size [{}] for [{}] is too large; setting to maximum [{}] instead";
                        size; name; availableProcessors);
            size = availableProcessors;
        }

        return size;




 

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