Failed to serialize repository data – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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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.

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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.

Log Context

Log “Failed to serialize repository data” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            } catch (IOException e) {
                assert false : new AssertionError("Impossible; no IO happens here"; e);
                logger.warn("Failed to serialize repository data"; e);
            latestKnownRepositoryData.updateAndGet(known -> {
                if (known != null && known.v1() > generation) {
                    return known;


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