---
title: "Migrating from MongoDB 6.0 to 8.0: How Percona ClusterSync Handles Cross-Version Replication"
url: https://daily.dev/posts/migrating-from-mongodb-6-0-to-8-0-how-percona-clustersync-handles-cross-version-replication-xy8u0qodj
source_url: https://www.percona.com/blog/migrating-from-mongodb-6-0-to-8-0-how-percona-clustersync-handles-cross-version-replication
type: article
source: "Percona Blog"
published: 2026-06-04T11:46:45.774Z
updated: 2026-06-04T11:47:09.735Z
tags: ["database", "mongodb"]
reading_time: 6
upvotes: 1
comments: 1
language: en
---

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# Migrating from MongoDB 6.0 to 8.0: How Percona ClusterSync Handles Cross-Version Replication

**[Percona Blog](https://daily.dev/sources/percona)** · 6 min read · 1 upvotes · 1 comments

## Summary

Percona ClusterSync for MongoDB (PCSM) 0.9.0 adds cross-version replication support, enabling near-zero-downtime migrations from MongoDB 6.0 directly to 8.0 without requiring an intermediate same-version step. The engineering team discovered that the expected complexity — a change-stream event translation layer between major versions — was unnecessary, as MongoDB 6.0 and 8.0 produce identical change-stream events for the operations PCSM handles. The real problem was a single swallowed DDL error that caused cascading failures. Key fixes include surfacing DDL errors to halt diverged replication, a version-compatibility gate that blocks downgrades, a capped-collection size rounding fix specific to 6.x behavior, and a TTL index recreation workaround for 8.0's stricter index-options validation. The supported matrix now covers all lower-to-higher pairs among 6.0, 7.0, and 8.0 on both replica-set and sharded topologies.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://www.percona.com/blog/migrating-from-mongodb-6-0-to-8-0-how-percona-clustersync-handles-cross-version-replication>

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---

Tags: [#database](https://daily.dev/tags/database), [#mongodb](https://daily.dev/tags/mongodb)

[View this post on daily.dev](https://daily.dev/posts/migrating-from-mongodb-6-0-to-8-0-how-percona-clustersync-handles-cross-version-replication-xy8u0qodj)