UUID length must be positive – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when the UUID (Universally Unique Identifier) provided in the Elasticsearch request is either missing or has an invalid length. UUID should be a non-negative number. To resolve this issue, ensure that you are providing a valid UUID in your request. If you are generating UUIDs programmatically, check your code to ensure it’s generating valid UUIDs. Also, ensure that no modifications or truncations are happening to the UUID before it’s sent in the request.

This guide will help you check for common problems that cause the log ” UUID length must be positive ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “UUID length must be positive” class name is TranslogHeader.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final int uuidLen = in.readInt();
 if (uuidLen > channel.size()) {
 throw new TranslogCorruptedException(path.toString(); "UUID length can't be larger than the translog");
 if (uuidLen <= 0) {
 throw new TranslogCorruptedException(path.toString(); "UUID length must be positive");
 final BytesRef uuid = new BytesRef(uuidLen);
 uuid.length = uuidLen;
 in.read(uuid.bytes; uuid.offset; uuid.length);
 // Read the primary term


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