Translog looks like version 1 or later but has corrupted header – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1.2-2.9

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Briefly, this error occurs when the transaction log (Translog) in OpenSearch is corrupted. The Translog is crucial for data recovery and replication. Corruption can occur due to unexpected shutdowns, hardware failures, or software bugs. To resolve this, you can try to restore from a recent backup. If that’s not possible, you can delete the corrupted Translog file, but this may result in data loss. Alternatively, you can try to repair the Translog, but this requires advanced knowledge and should be done with caution.

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This guide will help you check for common problems that cause the log ” translog looks like version 1 or later; but has corrupted header ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, version.

Log Context

Log “translog looks like version 1 or later; but has corrupted header” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 // so we know if we grab the first byte; it can be:
 // 0x3f => Lucene's magic number; so we can assume it's version 1 or later
 // 0x00 => version 0 of the translog
 final byte b1 = Channels.readFromFileChannel(channel; 0; 1)[0];
 if (b1 == 0x3f) { // LUCENE_CODEC_HEADER_BYTE
 throw new TranslogCorruptedException(path.toString(); "translog looks like version 1 or later; but has corrupted header");
 } else if (b1 == 0x00) { // UNVERSIONED_TRANSLOG_HEADER_BYTE
 throw new IllegalStateException("pre-1.4 translog found [" + path + "]");


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