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Ashwanth 5cef03d0ea index-shipper: add support for multiple stores (#7754) ... Signed-off-by: Ashwanth Goli <iamashwanth@gmail.com> **What this PR does / why we need it**: Currently loki initializes a single instance of index-shipper to [handle all the table ranges](ff7b462973/pkg/storage/factory.go (L188)) (from across periods) for a given index type `boltdb-shipper, tsdb`. Since index-shipper only has the object client handle to the store defined by `shared_store_type`, it limits the index uploads to a single store. Setting `shared_store_type` to a different store at a later point in time would mean losing access to the indexes stored in the previously configured store. With this PR, we initialize a separate index-shipper & table manager for each period if `shared_store_type` is not explicity configured. This offers the flexibility to store index in multiple stores (across providers). **Note**: - usage of `shared_store_type` in this commit text refers to one of these config options depending on the index in use: `-boltdb.shipper.shared-store`, `-tsdb.shipper.shared-store` - `shared_store_type` used to default to the `object_store` from the latest `period_config` if not explicitly configured. This PR removes these defaults in favor of supporting index uploads to multiple stores. **Which issue(s) this PR fixes**: Fixes #7276 **Special notes for your reviewer**: All the instances of downloads table manager operate on the same cacheDir. But it shouldn't be a problem as the tableRanges do not overlap across periods. **Checklist** - [X] Reviewed the `CONTRIBUTING.md` guide - [ ] Documentation added - [X] Tests updated - [x] `CHANGELOG.md` updated - [x] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_index.md` --------- Signed-off-by: Ashwanth Goli <iamashwanth@gmail.com> Co-authored-by: J Stickler <julie.stickler@grafana.com>		2 years ago
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merger.go	index-shipper: add support for multiple stores (#7754)	2 years ago