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mdbx: allow mixind with/without MDBX_WRITEMAP for the same database.

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Change-Id: I916bb9e9b44a58cf78786e76a8c42d62e0bfc579
This commit is contained in:
Leonid Yuriev 2020-06-20 23:55:15 +03:00
parent 171a254425
commit 0fc2d39cce
2 changed files with 6 additions and 11 deletions
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14
mdbx.h
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@ -999,9 +999,6 @@ LIBMDBX_API const char *mdbx_dump_val(const MDBX_val *key, char *const buf,
* database pages and more work for tracking ones, which neuters a
* performance boost caused by the MDBX_WRITEMAP mode.
*
* NOTE: MDBX don't allow to mix processes with and without MDBX_WRITEMAP on
* the same environment. In such case MDBX_INCOMPATIBLE will be generated.
*
* - with MDBX_WRITEMAP = all data will be mapped into memory in the read-write
* mode. This offers a significant performance benefit, since the data will
* be modified directly in mapped memory and then flushed to disk by
@ -1611,9 +1608,9 @@ LIBMDBX_API int mdbx_env_create(MDBX_env **penv);
* NOTE: MDB_NOLOCK flag don't supported by MDBX,
* try use MDBX_EXCLUSIVE as a replacement.
*
* NOTE: MDBX don't allow to mix processes with different MDBX_WRITEMAP,
* MDBX_SAFE_NOSYNC, MDBX_NOMETASYNC, MDBX_MAPASYNC flags on the same
* environment. In such case MDBX_INCOMPATIBLE will be returned.
* NOTE: MDBX don't allow to mix processes with different MDBX_SAFE_NOSYNC,
* MDBX_NOMETASYNC, MDBX_MAPASYNC flags on the same environment.
* In such case MDBX_INCOMPATIBLE will be returned.
*
* If the database is already exist and parameters specified early by
* mdbx_env_set_geometry() are incompatible (i.e. for instance, different page
@ -1637,9 +1634,8 @@ LIBMDBX_API int mdbx_env_create(MDBX_env **penv);
* or the current process tries to open environment
* more than once.
* - MDBX_INCOMPATIBLE = Environment is already opened by another process,
* but with different set of MDBX_WRITEMAP,
* MDBX_SAFE_NOSYNC, MDBX_NOMETASYNC, MDBX_MAPASYNC
* flags.
* but with different set of MDBX_SAFE_NOSYNC,
* MDBX_NOMETASYNC, MDBX_MAPASYNC flags.
* Or if the database is already exist and
* parameters specified early by
* mdbx_env_set_geometry() are incompatible (i.e.

3
src/core.c
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@ -10189,8 +10189,7 @@ int __cold mdbx_env_open(MDBX_env *env, const char *pathname, unsigned flags,
goto bailout;
}
const unsigned rigorous_flags =
MDBX_WRITEMAP | MDBX_SAFE_NOSYNC | MDBX_MAPASYNC;
const unsigned rigorous_flags = MDBX_SAFE_NOSYNC | MDBX_MAPASYNC;
const unsigned mode_flags = rigorous_flags | MDBX_NOMETASYNC |
MDBX_LIFORECLAIM | MDBX_COALESCE | MDBX_NORDAHEAD;