Briefly, this error occurs when Elasticsearch is unable to retrieve version information from the snapshot metadata, possibly due to corruption or inaccessibility of the snapshot. To resolve this issue, you can try the following: 1) Check the integrity of your snapshot and restore it again. 2) Verify the accessibility of the snapshot repository. 3) If the snapshot is corrupted, consider creating a new snapshot. 4) Ensure that the Elasticsearch version used to create the snapshot is compatible with the version trying to read it.
This guide will help you check for common problems that cause the log ” Failure when trying to load missing version information from snapshot metadata ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: metadata, snapshot, blobstore, repositories, version.
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 “Failure when trying to load missing version information from snapshot metadata” classname is BlobStoreRepository.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
snapshotIdsWithoutVersion; SnapshotId::toString; logger.isDebugEnabled()));
}
@Override
public void onFailure(Exception e) {
logger.warn("Failure when trying to load missing version information from snapshot metadata"; e);
}
}; () -> filterRepositoryDataStep.onResponse(repositoryData.withVersions(updatedVersionMap)));
snapshotIdsWithoutVersion.size());
for (SnapshotId snapshotId : snapshotIdsWithoutVersion) {
threadPool().executor(ThreadPool.Names.SNAPSHOT).execute(ActionRunnable.run(loadAllVersionsListener; () ->
