Adding mutable metadata and cluster id #803
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wxing1292
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schema/mysql/v57/temporal/versioned/v1.1/mutable_cluster_metadata.sql
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schema/postgresql/temporal/versioned/v1.1/mutable_cluster_metadata.sql
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plz also add corresponding tests here:
https://github.com/temporalio/temporal/blob/master/common/persistence/persistence-tests/clusterMetadataManagerTest.go
wxing1292
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…ng it instead of immutable metadata
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This change allows us to have have unique stable cluster id stored in the database and also provides ability to store any other cluster specific data alongside without having to fear that we will override immutable data.
It also allows changing mutability of certain fields in code when needed.
Previously all cluster metadata was immutable containing only cluster name (from the config) and shard count. This limited its usability as it was impossible to add new fields (e.g. cluster id) to it as well as store mutable components like latest available version.
In the first attempt I've tried to add another blob alongside immutable metadata but quickly realized that keeping it would result in messy code due to lack of clear boundary between mutable and immutable.
As a result I've decided to refactor existing implementation and move immutability check on application layer at the same time adding versioning to the storage.
Change was tested locally using persistence test and manually on cassandra/mysql.