Concurrent modification of the index-N file; expected current generation – How to solve this Elasticsearch error

Concurrent modification of the index-N file; expected current generation – How to solve this Elasticsearch error

Opster Team

July-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 ” concurrent modification of the index-N file; expected current generation ” 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: repositories and blobstore.

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”concurrent modification of the index-N file; expected current generation [“classname  is BlobStoreRepository.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

// snapshot delete run anyway.
  logger.debug("Determined repository's generation from its contents to [" + generation + "] but " +
  "current generation is at least [" + genToLoad + "]");
  }
  if (genToLoad != repositoryStateId) {
  throw new RepositoryException(metadata.name(); "concurrent modification of the index-N file; expected current generation [" +
  repositoryStateId + "]; actual current generation [" + genToLoad + "]");
  }
  if (cached != null && cached.v1() == genToLoad) {
  return repositoryDataFromCachedEntry(cached);
  }

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

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 recommendation]

 

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