Updating max-merged-segment from mb to – 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 ” Updating max-merged-segment from mb to ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, merge and shard.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

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

         }

        final double oldMaxMergedSegmentMB = mergePolicy.getMaxMergedSegmentMB();
        final ByteSizeValue maxMergedSegment = settings.getAsBytesSize(INDEX_MERGE_POLICY_MAX_MERGED_SEGMENT; null);
        if (maxMergedSegment != null && maxMergedSegment.mbFrac() != oldMaxMergedSegmentMB) {
            logger.info("updating [max_merged_segment] from [{}mb] to [{}]"; oldMaxMergedSegmentMB; maxMergedSegment);
            mergePolicy.setMaxMergedSegmentMB(maxMergedSegment.mbFrac());
        }

        final double oldReclaimDeletesWeight = mergePolicy.getReclaimDeletesWeight();
        final double reclaimDeletesWeight = settings.getAsDouble(INDEX_MERGE_POLICY_RECLAIM_DELETES_WEIGHT; oldReclaimDeletesWeight);




 

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