Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.
Try OpsGPT now for step-by-step guidance and tailored insights into your OpenSearch operation.
Briefly, this error occurs when OpenSearch is unable to convert the repository data into a format that can be easily stored or transmitted. This could be due to issues with the data itself, such as corruption, or problems with the serialization process. To resolve this issue, you could try reindexing the data, checking for any corruption or inconsistencies in the data, or reviewing the serialization settings to ensure they are correctly configured. Additionally, ensure that the version of OpenSearch you are using is compatible with the data you are trying to serialize.
For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.
This guide will help you check for common problems that cause the log ” Failed to serialize repository data ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: repository, repositories, blobstore.
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 serialize repository data” classname is BlobStoreRepository.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
latestKnownRepositoryData.set(null);
return;
}
} catch (IOException e) {
assert false : new AssertionError("Impossible; no IO happens here"; e);
logger.warn("Failed to serialize repository data"; e);
return;
}
latestKnownRepositoryData.updateAndGet(known -> {
if (known != null && known.v1() > generation) {
return known;
