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mdbx: rollback to not-a-weak instead to steady.

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This commit is contained in:
Leo Yuriev 2017-10-10 18:14:07 +03:00
parent b7121d7711
commit 4f1c846437
1 changed files with 5 additions and 4 deletions
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9
src/mdbx.c
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@ -1446,8 +1446,6 @@ static __inline bool mdbx_meta_ot(const enum meta_choise_mode mode,
mdbx_jitter4testing(true);
txnid_t txnid_a = mdbx_meta_txnid_fluid(env, a);
txnid_t txnid_b = mdbx_meta_txnid_fluid(env, b);
if (txnid_a == txnid_b)
return META_IS_STEADY(b) || (META_IS_WEAK(a) && !META_IS_WEAK(a));
mdbx_jitter4testing(true);
switch (mode) {
@ -1464,6 +1462,8 @@ static __inline bool mdbx_meta_ot(const enum meta_choise_mode mode,
/* fall through */
case prefer_last:
mdbx_jitter4testing(true);
if (txnid_a == txnid_b)
return META_IS_STEADY(b) || (META_IS_WEAK(a) && !META_IS_WEAK(b));
return txnid_a < txnid_b;
}
}
@ -3810,7 +3810,8 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
}
if (page.mp_meta.mm_magic_and_version != MDBX_DATA_MAGIC) {
mdbx_error("meta[%u] has invalid magic/version", meta_number);
mdbx_error("meta[%u] has invalid magic/version MDBX_DEVEL=%d",
meta_number, MDBX_DEVEL);
return ((page.mp_meta.mm_magic_and_version >> 8) != MDBX_MAGIC)
? MDBX_INVALID
: MDBX_VERSION_MISMATCH;
@ -3964,7 +3965,7 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
continue;
}
if (mdbx_meta_ot(prefer_steady, env, meta, &page.mp_meta)) {
if (mdbx_meta_ot(prefer_noweak, env, meta, &page.mp_meta)) {
*meta = page.mp_meta;
if (META_IS_WEAK(meta))
loop_limit += 1; /* LY: should re-read to hush race with update */