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scylladb/test/boost
Kamil Braun 4dfb7e3051 Merge 'storage_service::merge_topology_snapshot: handle big mutations' from Petr Gusev
The group0 state machine calls `merge_topology_snapshot` from
`transfer_snapshot`. It feeds it with `raft_topology_snapshot` returned
from `raft_pull_topology_snapshot`. This snapshot includes the entire
`system.cdc_generations_v3` table. It can be huge and break the
commitlog `max_record_size` limit.

The `system.cdc_generations_v3` is a single-partition table, so all the
data is contained in one mutation object. To fit the commitlog limit we
split this mutation into many smaller ones and apply them in separate
`database::apply` calls. That means we give up the atomicity guarantee,
but we actually don't need it for `system.cdc_generations_v3` and
`system.topology_requests`.

This PR fixes the dtest
`update_cluster_layout_tests.py::TestLargeScaleCluster::test_add_many_nodes_under_load`

Fixes scylladb/scylladb#17545

Closes scylladb/scylladb#17632

* github.com:scylladb/scylladb:
  test_cdc_generation_data: test snapshot transfer
  storage_service::merge_topology_snapshot: handle big cdc_generations_v3 mutations
  mutation: add split_mutation function
  storage_service::merge_topology_snapshot: fix indentation
2024-03-21 10:50:03 +01:00
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