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Briefly, this error occurs when OpenSearch successfully loads all snapshot’s version information from the snapshot metadata. However, this is not an error but an informational message indicating that the operation has been completed successfully. If you’re seeing this message frequently and it’s causing concern, you may want to adjust your logging levels to exclude informational messages. Alternatively, if you’re experiencing issues with your snapshots, you should investigate your snapshot settings and configurations to ensure they’re correct.
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This guide will help you check for common problems that cause the log ” Successfully loaded all snapshot’s version information for {} from snapshot metadata ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: blobstore, version, snapshot, repositories, metadata.
Overview
A version corresponds to the OpenSearch built-in tracking system that tracks the changes in each document’s update. When a document is indexed for the first time, it is assigned a version 1 using _version key. When the same document gets a subsequent update, the _version is incremented by 1 with every index, update or delete API call.
What it is used for
A version is used to handle the concurrency issues in OpenSearch which come into play during simultaneous accessing of an index by multiple users. OpenSearch handles this issue with an optimistic locking concept using the _version parameter to avoid letting multiple users edit the same document at the same time and protects users from generating incorrect data.
Notes
You cannot see the history of the document using _version. That means OpenSearch does not use _version to keep track of original changes that had been performed on the document. For example, if a document has been updated 10 times, it’s _version would be marked by OpenSearch as 11, but you cannot go back and see what version 5 of the document looked like. This has to be implemented independently.
Common problems
If optimistic locking is not implemented while making updates to a document, OpenSearch may return a conflict error with the 409 status code, which means that multiple users are trying to update the same version of the document at the same time.
POST /ratings/123?version=50
{
"name": "Joker",
"rating": 50
}Log Context
Log “Successfully loaded all snapshot’s version information for {} from snapshot metadata” classname is BlobStoreRepository.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
final GroupedActionListenerloadAllVersionsListener = new GroupedActionListener( ActionListener.runAfter( new ActionListener >() { @Override public void onResponse(Collection voids) { logger.info("Successfully loaded all snapshot's version information for {} from snapshot metadata"; AllocationService.firstListElementsToCommaDelimitedString( snapshotIdsWithoutVersion; SnapshotId::toString; logger.isDebugEnabled())); } @Override
