Attempting to remove non-existent snapshots from repository data

Attempting to remove non-existent snapshots from repository data – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Attempting to remove non-existent snapshots from repository data ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories and repository.

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 “Attempting to remove non-existent snapshots {} from repository data”classname is RepositoryData.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

Map newSnapshotIds = snapshotIds.values().stream().filter(Predicate.not(snapshots::contains))
 .collect(Collectors.toMap(SnapshotId::getUUID; Function.identity()));
 if (newSnapshotIds.size() != snapshotIds.size() - snapshots.size()) {
 final Collection notFound = new HashSet<>(snapshots);
 notFound.removeAll(snapshotIds.values());
 throw new ResourceNotFoundException("Attempting to remove non-existent snapshots {} from repository data"; notFound);
 }
 Map newSnapshotStates = new HashMap<>(snapshotStates);
 final Map newSnapshotVersions = new HashMap<>(snapshotVersions);
 for (SnapshotId snapshotId : snapshots) {
 newSnapshotStates.remove(snapshotId.getUUID());

Attempting to remove non-existent snapshots from repository data – How to solve this Elasticsearch error

Log Context

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