Concurrent modification of the index-N file; expected current generation – Elasticsearch Error How To Solve Related Issues



Concurrent modification of the index-N file; expected current generation – Elasticsearch Error How To Solve Related Issues

Opster Team

July-20, Version: 1.7-8.0

 

Before you read this guide, we recommend you run the Elasticsearch Error Check-Up which detects issues in ES causing log errors (free tool that requires no installation). 

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, 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 discover the cause of many errors and provides suitable actionable recommendations how to resolve them (join over 700 users who use this free tool).

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);
  }

 





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