Updating max merge count from to – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.3-1.3

Briefly, this error occurs when Elasticsearch is adjusting the maximum number of segments in an index that can be merged at once. This is a part of Elasticsearch’s internal process to optimize the performance of search queries. It’s not an error but an informational message. However, if you’re experiencing performance issues, you might want to adjust the index settings, specifically the ‘index.merge.scheduler.max_merge_count’ parameter. You can also consider adjusting the ‘index.merge.policy.segments_per_tier’ parameter. Always monitor the performance after making such changes.

This guide will help you check for common problems that cause the log ” updating [max_merge_count] from [{}] to [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index and merge.

Log Context

Log “updating [max_merge_count] from [{}] to [{}]” classname is ConcurrentMergeSchedulerProvider.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 }
            }

            int maxMergeCount = settings.getAsInt("index.merge.scheduler.max_merge_count"; ConcurrentMergeSchedulerProvider.this.maxMergeCount);
            if (maxMergeCount != ConcurrentMergeSchedulerProvider.this.maxMergeCount) {
                logger.info("updating [max_merge_count] from [{}] to [{}]"; ConcurrentMergeSchedulerProvider.this.maxMergeCount; maxMergeCount);
                ConcurrentMergeSchedulerProvider.this.maxMergeCount = maxMergeCount;
                for (CustomConcurrentMergeScheduler scheduler : schedulers) {
                    scheduler.setMaxMergesAndThreads(maxMergeCount; ConcurrentMergeSchedulerProvider.this.maxThreadCount);
                }
            }




 

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