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refs #4964, add some comments for changing a descriptor

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git-svn-id: file:///svn/toku/tokudb@45060 c7de825b-a66e-492c-adef-691d508d4ae1
This commit is contained in:
Zardosht Kasheff 2013-04-17 00:00:55 -04:00 • committed by Yoni Fogel
parent 864e6270a2
commit beb00d9edd
2 changed files with 10 additions and 0 deletions
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4
ft/ft-ops.c
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@ -3071,6 +3071,10 @@ verify_builtin_comparisons_consistent(FT_HANDLE t, u_int32_t flags) {
return 0; return 0;
} }
//
// See comments in toku_db_change_descriptor to understand invariants
// in the system when this function is called
//
int int
toku_ft_change_descriptor( toku_ft_change_descriptor(
FT_HANDLE ft_h, FT_HANDLE ft_h,

6
src/ydb_db.c
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@ -466,6 +466,12 @@ int toku_db_pre_acquire_fileops_lock(DB *db, DB_TXN *txn) {
// This function is used both to set an initial descriptor of a DB and to // This function is used both to set an initial descriptor of a DB and to
// change a descriptor. (only way to set a descriptor of a DB) // change a descriptor. (only way to set a descriptor of a DB)
// //
// Requires:
// - The caller must not call put_multiple, del_multiple, or update_multiple concurrently
// - The caller must not have a hot index running concurrently on db
// - If the caller has passed DB_UPDATE_CMP_DESCRIPTOR as a flag, then he is calling this function
// ONLY immediately after creating the dictionary and before doing any actual work on the dictionary.
//
static int static int
toku_db_change_descriptor(DB *db, DB_TXN* txn, const DBT* descriptor, u_int32_t flags) { toku_db_change_descriptor(DB *db, DB_TXN* txn, const DBT* descriptor, u_int32_t flags) {
HANDLE_PANICKED_DB(db); HANDLE_PANICKED_DB(db);