Briefly, this error occurs when Elasticsearch is unable to delete the metadata associated with a snapshot that has been removed. This could be due to insufficient permissions, a locked file, or a network issue. To resolve this, you can try to manually delete the metadata file, ensure that Elasticsearch has the necessary permissions, or check the network connection. If the issue persists, you may need to restart the Elasticsearch service or, in extreme cases, recreate the snapshot repository.
This guide will help you check for common problems that cause the log ” {} failed to remove snapshot deletion metadata ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: metadata, snapshot.
Overview
Metadata in Elasticsearch refers to additional information stored for each document. This is achieved using the specific metadata fields available in Elasticsearch. The default behavior of some of these metadata fields can be customized during mapping creation.
Examples
Using _meta meta-field for storing application-specific information with the mapping:
PUT /my_index?pretty
{
"mappings": {
"_meta": {
"domain": "security",
"release_information": {
"date": "18-01-2020",
"version": "7.5"
}
}
}
}Notes
- In version 2.x, Elasticsearch had a total 13 meta fields available, which are: _index, _uid, _type, _id, _source, _size, _all, _field_names, _timestamp, _ttl, _parent, _routing, _meta
- In version 5.x, _timestamp and _ttl meta fields were removed.
- In version 6.x, the _parent meta field was removed.
- In version 7.x, _uid and _all meta fields were removed.
Log Context
Log “{} failed to remove snapshot deletion metadata” classname is SnapshotsService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
return res.v1();
}
@Override
public void onFailure(Exception e) {
logger.warn(() -> new ParameterizedMessage("{} failed to remove snapshot deletion metadata"; deleteEntry); e);
repositoryOperations.finishDeletion(deleteEntry.uuid());
failAllListenersOnMasterFailOver(e);
}
protected SnapshotDeletionsInProgress filterDeletions(SnapshotDeletionsInProgress deletions) {
