How To Solve Issues Related to Log – Failed to delete shard snapshot file

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Updated: Jan-20

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Troubleshooting background

To troubleshoot Elasticsearch log “Failed to delete shard snapshot file” it’s important to understand common problems related to Elasticsearch concepts: blobstore, delete, discovery-file, repositories, repository-azure, shard, snapshot. See detailed explanations below complete with common problems, examples and useful tips.

DELETE Elasticsearch API

What is it

DELETE  is an Elasticsearch API which removes a document from a specific index. This API requires an index name and _id document to delete the document. 

Delete a document

DELETE /my_index/_doc/1
Notes
  • A delete request throws 404 error code if the document does not already exist in the index.
  • If you want to delete a set of documents that  matches a query, you need to use delete by query API.


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

1 Github Issue Number 27061  

2Github Issue Number 23716  


Log Context

Log ”[{}] [{}] failed to delete shard snapshot file” classname is BlobStoreRepository.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

<pre class="wp-block-syntaxhighlighter-code">             int fileListGeneration = tuple.v2();

            try {
                indexShardSnapshotFormat.delete(blobContainer; snapshotId.getUUID());
            } catch (IOException e) {
                logger.warn(new ParameterizedMessage("[{}] [{}] failed to delete shard snapshot file"; shardId; snapshotId); e);
            }

            // Build a list of snapshots that should be preserved
            List<SnapshotFiles> newSnapshotsList = new ArrayList<>();
            for (SnapshotFiles point : snapshots) {




</pre>

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