Failed to get size for – 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 retrieve the size of a specific index or file. This could be due to a lack of permissions, a non-existent index, or a corrupted file. To resolve this issue, you can check if the index or file exists and is not corrupted. If it’s a permissions issue, ensure that OpenSearch has the necessary permissions to access the file or index. If the file or index is corrupted, you may need to restore it from a backup or recreate it.

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This guide will help you check for common problems that cause the log ” failed to get size for [{}] ” 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 get size for [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            numDocs += readerContext.reader().numDocs();
            numDeletedDocs += readerContext.reader().numDeletedDocs();
            try {
                sizeInBytes += info.sizeInBytes();
            } catch (IOException e) {
                logger.trace(() -> new ParameterizedMessage("failed to get size for [{}]";; e);
        return new DocsStats(numDocs; numDeletedDocs; sizeInBytes);


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