Why it matters

Metastore outage stops SQL. HA essential.

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The architecture

Multiple metastore processes.

Load balancer in front.

Shared DB (MySQL/Postgres HA).

Metastore HA layoutMetastore instancesmultipleLoad balancerdistributesShared DB HAPostgres/MySQLDB is often the actual SPOF; ensure DB is HA too
Metastore HA architecture.
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How it works end to end

DB HA: primary + replica; automatic failover.

Backup: DB backups regular.

Version compat between metastore + engines.