Failed to upload blob – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.9

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Briefly, this error occurs when OpenSearch fails to upload a blob, which is a binary large object, to the blob store. This could be due to insufficient storage space, network connectivity issues, or incorrect blob store configuration. To resolve this issue, you can try freeing up storage space, checking your network connection, or reviewing and correcting your blob store configuration. Additionally, ensure that the blob store has the necessary read/write permissions.

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This guide will help you check for common problems that cause the log ” Failed to upload blob {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “Failed to upload blob {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            try (InputStream inputStream = fileSnapshot.inputStream()) {
                    .writeBlobAtomic(fileSnapshot.getName(); inputStream; fileSnapshot.getContentLength(); true);
            } catch (Exception e) {
                logger.error(() -> new ParameterizedMessage("Failed to upload blob {}"; fileSnapshot.getName()); e);
                l.onFailure(new FileTransferException(fileSnapshot; e));


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