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

Opster Team

Aug-23, Version: 7.7-7.13

Briefly, this error occurs when Elasticsearch is unable to convert the repository data into a format that can be stored or transferred. This could be due to a variety of reasons such as incompatible data types, incorrect data format, or a bug in the serialization process. To resolve this issue, you can try the following: 1) Check the data types and formats to ensure they are compatible with Elasticsearch. 2) Update Elasticsearch to the latest version to fix any potential bugs. 3) If the error persists, consider reindexing your data or using a different repository.

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 Elasticsearch concepts: repositories, blobstore, repository.

Log Context

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

                return null;
            return serialized;
        } catch (IOException e) {
            assert false : new AssertionError("Impossible; no IO happens here"; e);
            logger.warn("Failed to serialize repository data"; e);
            return null;

    private RepositoryException corruptedStateException(@Nullable Exception cause; @Nullable Tuple previousWriterInfo) {


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