Could not find a readable index-N file in a non-empty shard snapshot directory – How to solve related issues

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Could not find a readable index-N file in a non-empty shard snapshot directory – How to solve related issues

Opster Team

Jan-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 ” Could not find a readable index-N file in a non-empty shard snapshot directory ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: blobstore, discovery-file, repositories, repository-azure 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 “Could not find a readable index-N file in a non-empty shard snapshot directory [{}]” classname is BlobStoreRepository.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 } 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());
            }

            // We couldn't load the index file - falling back to loading individual snapshots
            List snapshots = new ArrayList();
            for (String name : blobKeys) {




 

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