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https://issues.apache.org/jira/browse/HIVE-29645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhihua Deng updated HIVE-29645:
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Description:
ObjectStore is the default implementation of RawStore and has grown into a very
large, monolithic class that handles catalogs, databases, tables, partitions,
privileges, column stats, constraints, functions, notifications, and more.
This refactoring aligns with the long-standing objective of mitigating the size
and complexity of the ObjectStore implementation(cf.HIVE-14730). By decomposing
the large RawStore/ObjectStore into smaller, domain-oriented store interfaces
and implementations, we can reduce the complexity and maintenance of
ObjectStore, improve separation of concerns, and create a cleaner foundation
for future evolution of metastore persistence logic. It also centralizes
transaction/query lifecycle management through helper/proxy abstractions so
that the new sub-stores can reuse the existing persistence behavior without
duplicating boilerplate.
More can refer to the attached design document.
was:This refactoring aligns with the long-standing objective of mitigating
the size and complexity of the ObjectStore implementation(cf.HIVE-14730). By
decomposing the large RawStore/ObjectStore into smaller, domain-oriented store
interfaces and implementations, we can reduce the complexity and maintenance of
ObjectStore, improve separation of
concerns,andcreateacleanerfoundationforfutureevolutionofmetastorepersistencelogic.Italsocentralizestransaction/querylifecyclemanagementthroughhelper/proxyabstractionssothatthenewsub-storescanreusetheexistingpersistencebehaviorwithoutduplicatingboilerplate
> Refactoring Hive Metastore RawStore into pluggable sub-stores
> -------------------------------------------------------------
>
> Key: HIVE-29645
> URL: https://issues.apache.org/jira/browse/HIVE-29645
> Project: Hive
> Issue Type: Task
> Components: Standalone Metastore
> Reporter: Zhihua Deng
> Priority: Major
> Attachments: HIVE-29645-pluggable-substores.pdf
>
>
> ObjectStore is the default implementation of RawStore and has grown into a
> very large, monolithic class that handles catalogs, databases, tables,
> partitions, privileges, column stats, constraints, functions, notifications,
> and more.
> This refactoring aligns with the long-standing objective of mitigating the
> size and complexity of the ObjectStore implementation(cf.HIVE-14730). By
> decomposing the large RawStore/ObjectStore into smaller, domain-oriented
> store interfaces and implementations, we can reduce the complexity and
> maintenance of ObjectStore, improve separation of concerns, and create a
> cleaner foundation for future evolution of metastore persistence logic. It
> also centralizes transaction/query lifecycle management through helper/proxy
> abstractions so that the new sub-stores can reuse the existing persistence
> behavior without duplicating boilerplate.
> More can refer to the attached design document.
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