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Briefly, this error occurs when OpenSearch is unable to read metadata from the data store. This could be due to issues like incorrect file permissions, corrupted metadata files, or connectivity problems with the data store. To resolve this, you can check and correct file permissions, restore metadata files from a backup, or troubleshoot connectivity issues with the data store. If the problem persists, consider reindexing your data.
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This guide will help you check for common problems that cause the log ” [{}] can’t read metadata from store; responding with empty ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: indices, 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 “[{}] can’t read metadata from store; responding with empty” classname is TransportNodesListShardStoreMetadata.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
return storeFilesMetadata;
} catch (org.apache.lucene.index.IndexNotFoundException e) {
logger.trace(new ParameterizedMessage("[{}] node is missing index; responding with empty"; shardId); e);
return new StoreFilesMetadata(shardId; Store.MetadataSnapshot.EMPTY; Collections.emptyList());
} catch (IOException e) {
logger.warn(new ParameterizedMessage("[{}] can't read metadata from store; responding with empty"; shardId); e);
return new StoreFilesMetadata(shardId; Store.MetadataSnapshot.EMPTY; Collections.emptyList());
}
}
}
final String customDataPath;
