How To Solve Issues Related to Log – Failed to read index file

How To Solve Issues Related to Log – Failed to read index file

Updated: Jan-20

Elasticsearch Version: 1.7-8.0


Before you begin reading this guide try our beta Elasticsearch Health Check-Up it analyses JSON’s to provide personalized recommendations that can improve your clusters performance.

To troubleshoot log “Failed to read index file” it’s important to understand a few problems related to Elasticsearch concepts blobstore, discovery-file, index, repositories, repository-azure. See bellow important tips and explanations on these concepts

Log Context

Log”Failed to read index file [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                     final BlobStoreIndexShardSnapshots shardSnapshots =
              ; Integer.toString(latest));
                    return new Tuple<>(shardSnapshots; latest);
                } catch (IOException e) {
                    final String file = SNAPSHOT_INDEX_PREFIX + latest;
                    logger.warn(() -> new ParameterizedMessage("failed to read index file [{}]"; file); e);
            } else if (blobKeys.isEmpty() == false) {
                logger.warn("Could not find a readable index-N file in a non-empty shard snapshot directory [{}]"; blobContainer.path());

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Elasticsearch crashes after showing t: failed to read local state , exiting 2.27 K 2

Github Issue Number 28906  

Github Issue Number 23716

About Opster

Opster detects root causes of Elasticsearch problems, provides automated recommendations and can perform various actions to prevent issues and optimize performance

Find Configuration Errors

Analyze Now