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Briefly, this error occurs when OpenSearch fails to delete the metadata associated with a snapshot. This could be due to insufficient permissions, a corrupt snapshot, or issues with the underlying storage system. To resolve this, you can try the following: 1) Check and adjust the permissions of the user trying to delete the snapshot. 2) Try to repair the corrupt snapshot or delete it if it’s not needed. 3) Investigate the health and connectivity of your storage system, and fix any identified issues.
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This guide will help you check for common problems that cause the log ” [{}] failed to remove snapshot metadata ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: snapshot, metadata.
Overview
Metadata in OpenSearch refers to additional information stored for each document. This is achieved using the specific metadata fields available in OpenSearch. 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
- Meta fields available include: _index, _type, _id, _source, _size, and _field_name.
Log Context
Log “[{}] failed to remove snapshot metadata” classname is SnapshotsService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
);
}
@Override
public void onFailure(String source; Exception e) {
logger.warn(() -> new ParameterizedMessage("[{}] failed to remove snapshot metadata"; snapshot); e);
failSnapshotCompletionListeners(
snapshot;
new SnapshotException(snapshot; "Failed to remove snapshot from cluster state"; e)
);
failAllListenersOnMasterFailOver(e);
