Transfer failed for snapshot – 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 is unable to successfully transfer a snapshot due to issues like network connectivity, insufficient disk space, or incorrect permissions. To resolve this, you can check your network connection and ensure it’s stable. Also, verify that there’s enough disk space available for the snapshot. Lastly, check the permissions of the directory where the snapshot is being stored to ensure OpenSearch has the necessary access rights.

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

Log Context

Log “Transfer failed for snapshot {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                Exception ex = new IOException("Failed to upload " + exceptionList.size() + " files during transfer");
                throw ex;
        } catch (Exception ex) {
            logger.error(() -> new ParameterizedMessage("Transfer failed for snapshot {}"; transferSnapshot); ex);
            translogTransferListener.onUploadFailed(transferSnapshot; ex);
            return false;


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