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[t:4838] the locktree now opens its own ft handle when created to ensure that the ft stays in memory so long as the lock tree is in memory. we use an on_create and on_destroy callback to keep the txn/ft logic out of the locktree. the api for toku_ltm_get_lt is a little hairy now. a better solution may come in the future. for now, the original failing test passes.


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close[t:5124] use a cleaner way of access an FT_HANDLE's descriptor pointers at the ydb layer. comment the ft API, too.


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[t:5113] carefully document a non-obvious contract requirement for change descriptor. clients may ONLY update a FT's cmp descriptor if it's the first operation done after open, before any reads or writes. further, remove the test - it's user error.


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[t:5113] spruce up the default parameters and put a reader-writer lock around the global variable used in the assertion, so we know for certain we're not just racing to read THAT variable


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[t:5112] removed the fd param from update descriptor, improved the name, removed some unnecessary return codes from functions that cannot fail

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[t:5110] Closes #5110 Skip taking the txn_manager lock for read-only transactions during note_abort/commit

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[t:4871] add test_stress_openclose.tdb to the list of stress tests that get ignored for valgrind/drd conflicts and things like that

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[t:5067] Merge #5067 to main.  New GC algorithm that calculates "live_list_reverse" on the fly when needed

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close[t:5100] close[t:4930] the api for closing a ft has been simplified for normal use. for recovery, there is a new function that internally asserts the underlying ft is close and passes a valid lsn to the cachefile for closing


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close[t:5109] address some comments from code review concerning the naming of functions that remove an ft from memory vs removing a ft from the filesystem.


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The previous fix added a new race condition; When the new race hits, we leak lock trees.

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