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Summary: Introducing the notion of AttributeGroup by adding the `MultiGetEntity()` API retrieving `PinnableAttributeGroups`. An "attribute group" refers to a logical grouping of wide-column entities within RocksDB. These attribute groups are implemented using column families. Users can store WideColumns in different CFs for various reasons (e.g. similar access patterns, same types, etc.). This new API `MultiGetEntity()` takes keys and `PinnableAttributeGroups` per key. `PinnableAttributeGroups` is just a list of `PinnableAttributeGroup`s in which we have `ColumnFamilyHandle*`, `Status`, and `PinnableWideColumns`. Let's say a user stored "hot" wide columns in column family "hot_data_cf" and "cold" wide columns in column family "cold_data_cf" and all other columns in "common_cf". Prior to this PR, if the user wants to query for two keys, "key_1" and "key_2" and but only interested in "common_cf" and "hot_data_cf" for "key_1", and "common_cf" and "cold_data_cf" for "key_2", the user would have to construct input like `keys = ["key_1", "key_1", "key_2", "key_2"]`, `column_families = ["common_cf", "hot_data_cf", "common_cf", "cold_data_cf"]` and get the flat list of `PinnableWideColumns` to find the corresponding <key,CF> combo. With the new `MultiGetEntity()` introduced in this PR, users can now query only `["common_cf", "hot_data_cf"]` for `"key_1"`, and only `["common_cf", "cold_data_cf"]` for `"key_2"`. The user will get `PinnableAttributeGroups` for each key, and `PinnableAttributeGroups` gives a list of `PinnableAttributeGroup`s where the user can find column family and corresponding `PinnableWideColumns` and the `Status`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11925 Test Plan: - `DBWideBasicTest::MultiCFMultiGetEntityAsPinnableAttributeGroups` added will enable this new API in the `db_stress` in a separate PR Reviewed By: ltamasi Differential Revision: D50017414 Pulled By: jaykorean fbshipit-source-id: 643611d1273c574bc81b94c6f5aeea24b40c4586 |
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| .. | ||
| db_wide_basic_test.cc | ||
| wide_column_serialization.cc | ||
| wide_column_serialization.h | ||
| wide_column_serialization_test.cc | ||
| wide_columns.cc | ||
| wide_columns_helper.cc | ||
| wide_columns_helper.h | ||
| wide_columns_helper_test.cc | ||