Briefly, this error occurs when Elasticsearch is unable to find the URL it needs to perform a certain operation. This could be due to a misconfiguration in the Elasticsearch settings or a missing endpoint in the API call. To resolve this issue, you can check the Elasticsearch configuration files to ensure the correct URLs are specified. Also, verify the API calls to ensure the correct endpoints are being used. If you’re using a client library, ensure it’s correctly configured with the right Elasticsearch URL.
This guide will help you check for common problems that cause the log ” missing url ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories.
Overview
An Elasticsearch 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 elasticsearch.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 “missing url” class name is URLRepository.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
URLHttpClient.Factory httpClientFactory
) {
super(metadata; namedXContentRegistry; clusterService; bigArrays; recoverySettings; BlobPath.EMPTY); if (URL_SETTING.exists(metadata.settings()) == false && REPOSITORIES_URL_SETTING.exists(environment.settings()) == false) {
throw new RepositoryException(metadata.name(); "missing url");
}
this.environment = environment;
supportedProtocols = SUPPORTED_PROTOCOLS_SETTING.get(environment.settings());
urlWhiteList = ALLOWED_URLS_SETTING.get(environment.settings()).toArray(new URIPattern[] {});
url = URL_SETTING.exists(metadata.settings())
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