[v24.1.x] Fix some concurrent memory access problems in partition balancer #18406
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Partition balancer relies on _topics_map_revision checks to safely iterate over topic table collections with partition granularity (i.e. references to partition data and replica sets are stored and accessed across yield points). To make this safe, increment _topics_map_revision every time _topics, _updates_in_progress, _disabled_partitions or nested collections are modified in a way that invalidates references or iterators. (cherry picked from commit 30bbfb1)
It is handy to have a base class for all instances of concurrent modifications. (cherry picked from commit 627db4d)
Shard-local allocation_state object is replaced when we are applying a controller snapshot. After this happens, all live allocated_partition objects become invalid. Detect this and throw concurrent_modification_error in case these objects are still used and make destructors no-op. (cherry picked from commit a57a575)
(cherry picked from commit 1c63990)
piyushredpanda
approved these changes
May 11, 2024
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Backport of PR #18305