branch-4.1: [fix](file-cache) Make sync clear use safe removal #64578#64692
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### What - Replace sync clear direct storage wipe with the safe block scan/remove path. - Keep busy blocks on holder lifecycle and synchronously remove releasable downloaded blocks. - Reject concurrent sync clear requests with HTTP 400. - Add large sync-clear and concurrent-clear BE tests with SyncPoint mocked storage removal. ### Tests - `sh run-be-ut.sh --run --filter "BlockFileCacheTest.clear_file_cache_sync*:BlockFileCacheTest.clear_retains_meta_directory_and_clears_meta_entries"` Co-authored-by: gavinchou <gavinchou@apache.org>
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yiguolei
approved these changes
Jun 23, 2026
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Cherry-picked from #64578