> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/gridgain/gridgain-8/gridgain8-management/migration-guides/apache-ignite-2x-8.9.md).

# Apache Ignite 2 (GridGain 8.9)

How to migrate from Apache Ignite 2.18 to the GridGain 8.10 Ultimate release, with links to the step-by-step procedure and planning reference material.

This guide describes how to migrate from Apache Ignite 2.18 to the GridGain 8.10 Ultimate release.

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[Migrating from Apache Ignite 2](/docs/gridgain/gridgain-8/gridgain8-management/migration-guides/apache-ignite-2x-8.9/migration-procedure.md)
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Step-by-step procedure for migrating a cluster, its data, clients, and tooling from Apache Ignite 2.18 to GridGain 8.10, with cutover, verification, and rollback.
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[What to Know Before Migrating](/docs/gridgain/gridgain-8/gridgain8-management/migration-guides/apache-ignite-2x-8.9/before-you-migrate.md)
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Planning reference for migrating from Apache Ignite 2.18 to GridGain 8: prerequisites, migration constraints, a compatibility summary, and effort estimates.
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[Features to Replace](/docs/gridgain/gridgain-8/gridgain8-management/migration-guides/apache-ignite-2x-8.9/features-to-replace.md)
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Apache Ignite 2 features that work differently or have no equivalent in GridGain 8, with what to do and how to verify each replacement.
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[Configuration and Validation Changes](/docs/gridgain/gridgain-8/gridgain8-management/migration-guides/apache-ignite-2x-8.9/configuration.md)
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Configuration changes when migrating from Apache Ignite 2 to GridGain 8: changed defaults, removed and unsupported properties, and binary field ordering.
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[APIs, Clients, and Extensions](/docs/gridgain/gridgain-8/gridgain8-management/migration-guides/apache-ignite-2x-8.9/apis-and-clients.md)
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SQL engine, per-language client, and plugin/SPI changes to account for when migrating applications from Apache Ignite 2 to GridGain 8.
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{% content-ref url="/pages/tLNl8xQpdtQ5PgHDB2Nb" %}
[Artifacts and Deployment](/docs/gridgain/gridgain-8/gridgain8-management/migration-guides/apache-ignite-2x-8.9/artifacts-and-modules.md)
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GridGain distribution formats, per-language build coordinate changes, Docker differences, and module and extension availability when migrating from Apache Ignite 2.
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[Monitoring and CLI Changes](/docs/gridgain/gridgain-8/gridgain8-management/migration-guides/apache-ignite-2x-8.9/operations.md)
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Monitoring and command-line changes when migrating from Apache Ignite 2 to GridGain 8, covering logs, metrics, system views, events, and the CLI tools.
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[Security Authorization Changes](/docs/gridgain/gridgain-8/gridgain8-management/migration-guides/apache-ignite-2x-8.9/security-authorization.md)
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How to migrate authorization from a secured Apache Ignite 2.x cluster to GridGain 8: retired permissions, coarser admin grants, and user management.
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