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Briefly, this error occurs when OpenSearch fails to modify the settings of a specified repository. This could be due to incorrect repository settings, insufficient permissions, or network connectivity issues. To resolve this, ensure that the repository settings are correct and that OpenSearch has the necessary permissions to modify the repository. Also, check your network connection to ensure that OpenSearch can communicate with the repository. If the issue persists, consider checking the OpenSearch logs for more detailed error information.
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This guide will help you check for common problems that cause the log ” failed to change repository [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: repositories, repository.
Quick links
Overview
An OpenSearch snapshot provides a backup mechanism that takes the current state and data in the cluster and saves it to a repository (read snapshot for more information). The backup process requires a repository to be created first. The repository needs to be registered using the _snapshot endpoint, and multiple repositories can be created per cluster. The following repository types are supported:
Repository types
| Repository type | Configuration type |
|---|---|
| Shared file system | Type: “fs” |
| S3 | Type : “s3” |
| HDFS | Type :“hdfs” |
| Azure | Type: “azure” |
| Google Cloud Storage | Type : “gcs” |
Examples
To register an “fs” repository:
PUT _snapshot/my_repo_01
{
"type": "fs",
"settings": {
"location": "/mnt/my_repo_dir"
}
}Notes and good things to know
- S3, HDFS, Azure and Google Cloud require a relevant plugin to be installed before it can be used for a snapshot.
- The setting, path.repo: /mnt/my_repo_dir needs to be added to opensearch.yml on all the nodes if you are planning to use the repo type of file system. Otherwise, it will fail.
- When using remote repositories, the network bandwidth and repository storage throughput should be high enough to complete the snapshot operations normally, otherwise you will end up with partial snapshots.
Log Context
Log “failed to change repository [{}]” classname is RepositoriesService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
try {
repository = createRepository(repositoryMetadata; typesRegistry);
} catch (RepositoryException ex) {
// TODO: this catch is bogus; it means the old repo is already closed;
// but we have nothing to replace it
logger.warn(() -> new ParameterizedMessage("failed to change repository [{}]";
repositoryMetadata.name()); ex);
}
}
} else {
try {
