Incremental source changes since a previously observed source version.
requiresReload is true when the source can no longer describe every
intervening change (for example after replacement, clearing, or journal
compaction). Buffered timelines then reload their complete hot window.
Incremental source changes since a previously observed source version.
requiresReloadis true when the source can no longer describe every intervening change (for example after replacement, clearing, or journal compaction). Buffered timelines then reload their complete hot window.