Exception while reading checksum of file this can happen if file is corrupted – 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 tries to read a file’s checksum but encounters an issue, typically because the file is corrupted. This corruption could be due to various reasons such as hardware failure, network issues, or software bugs. To resolve this, you can try restoring the file from a backup, if available. If the corrupted file is part of an index, you can try to reindex the data. If the issue persists, consider checking your hardware or network for any issues. Lastly, ensure your OpenSearch and all related software are up-to-date to avoid any known bugs.

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This guide will help you check for common problems that cause the log ” Exception while reading checksum of file: {}; this can happen if file is corrupted ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, shard.

Log Context

Log “Exception while reading checksum of file: {}; this can happen if file is corrupted” classname is IndexShard.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                logger.warn("Checksum mismatch between local and remote segment file: {}; will override local file"; file);
        } catch (NoSuchFileException | FileNotFoundException e) {
            logger.debug("File {} does not exist in local FS; downloading from remote store"; file);
        } catch (IOException e) {
            logger.warn("Exception while reading checksum of file: {}; this can happen if file is corrupted"; file);
        return false;



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