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Briefly, this error occurs when OpenSearch fails to delete the metadata associated with a snapshot that has been removed. This could be due to issues with the underlying storage system, network connectivity, or permissions. To resolve this, you can try the following: 1) Check and ensure that the storage system is functioning properly and has sufficient space. 2) Verify network connectivity between OpenSearch and the storage system. 3) Ensure OpenSearch has the necessary permissions to delete files from the storage system. 4) Retry the snapshot deletion operation.
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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 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 deletion metadata” classname is SnapshotsService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
return res.v1();
}
@Override
public void onFailure(String source; 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) {
