> 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/architecture/replication-and-consistency.md).

# Replication and Consistency

How GridGain keeps partition copies balanced and available as the cluster topology changes — full and historical rebalancing, and partition loss handling.

When nodes join or leave the cluster, GridGain moves partitions between nodes to keep data balanced and available. This section covers how rebalancing works, the faster history-based variant, and what happens when partitions are lost.

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[Data Rebalancing](/docs/gridgain/gridgain-8/architecture/replication-and-consistency/data-rebalancing.md)
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How GridGain redistributes partitions across nodes to keep data balanced, including rebalancing modes, thread pool, message throttling, and monitoring.
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[Historical Rebalancing](/docs/gridgain/gridgain-8/architecture/replication-and-consistency/historical-rebalancing.md)
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How historical rebalancing transfers only the WAL delta accumulated while a persistent node was offline, its requirements, sizing, and configuration.
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[Partition Loss Policy](/docs/gridgain/gridgain-8/architecture/replication-and-consistency/partition-loss-policy.md)
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How GridGain handles lost partitions through partition loss policies, how to listen for loss events, reset lost partitions, and recover in each cluster type.
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