Briefly, this error occurs when Elasticsearch is unable to delete a snapshot due to reasons like the snapshot is currently in use, the snapshot or the repository doesn’t exist, or due to insufficient permissions. To resolve this, ensure the snapshot is not in use, verify the snapshot and repository exist and are correctly named, and check that the user has the necessary permissions to delete snapshots. Also, ensure the Elasticsearch cluster is in a healthy state as a failing cluster can prevent snapshot deletion.
This guide will help you check for common problems that cause the log ” [{}] failed to delete snapshot ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: snapshot, delete.
Overview
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.
Log Context
Log “[{}] failed to delete snapshot” classname is SnapshotsService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
logger.debug("deleted snapshot completed - deleting files");
threadPool.executor(ThreadPool.Names.SNAPSHOT).execute(() -> {
try {
deleteSnapshot(snapshot.getRepository(); snapshot.getSnapshotId().getName(); listener; true);
} catch (Exception ex) {
logger.warn(() -> new ParameterizedMessage("[{}] failed to delete snapshot"; snapshot); ex);
}
}
);
};
e -> {
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