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mdbx: rework nodes/keys limitations.

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Change-Id: Id0515346d762d4554102775f26a0fc33f3c0f29e
This commit is contained in:
Leonid Yuriev
2021-03-07 16:27:12 +03:00
parent b164baa1f5
commit 7dfd3f18f8
2 changed files with 136 additions and 153 deletions
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34
src/internals.h
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@@ -211,19 +211,6 @@ typedef union {
#endif
} MDBX_atomic_uint64_t;
/* The minimum number of keys required in a database page.
* Setting this to a larger value will place a smaller bound on the
* maximum size of a data item. Data items larger than this size will
* be pushed into overflow pages instead of being stored directly in
* the B-tree node. This value used to default to 4. With a page size
* of 4096 bytes that meant that any item larger than 1024 bytes would
* go into an overflow page. That also meant that on average 2-3KB of
* each overflow page was wasted space. The value cannot be lower than
* 2 because then there would no longer be a tree structure. With this
* value, items larger than 2KB will go into overflow pages, and on
* average only 1KB will be wasted. */
#define MDBX_MINKEYS 2
/* A stamp that identifies a file as an MDBX file.
* There's nothing special about this value other than that it is easily
* recognizable, and it will reflect any byte order mismatches. */
@@ -939,8 +926,9 @@ struct MDBX_env {
#define me_lfd me_lck_mmap.fd
#define me_lck me_lck_mmap.lck
unsigned me_psize; /* DB page size, initialized from me_os_psize */
uint8_t me_psize2log; /* log2 of DB page size */
unsigned me_psize; /* DB page size, initialized from me_os_psize */
unsigned me_leaf_nodemax; /* max size of a leaf-node */
uint8_t me_psize2log; /* log2 of DB page size */
int8_t me_stuck_meta; /* recovery-only: target meta page or less that zero */
unsigned me_os_psize; /* OS page size, from mdbx_syspagesize() */
unsigned me_maxreaders; /* size of the reader table */
@@ -975,9 +963,8 @@ struct MDBX_env {
MDBX_PNL me_retired_pages;
/* Number of freelist items that can fit in a single overflow page */
unsigned me_maxgc_ov1page;
unsigned me_branch_nodemax; /* max size of a branch-node */
uint32_t me_live_reader; /* have liveness lock in reader table */
void *me_userctx; /* User-settable context */
uint32_t me_live_reader; /* have liveness lock in reader table */
void *me_userctx; /* User-settable context */
MDBX_atomic_uint64_t *me_sync_timestamp;
MDBX_atomic_uint64_t *me_autosync_period;
atomic_pgno_t *me_unsynced_pages;
@@ -1240,14 +1227,13 @@ static __maybe_unused __inline void mdbx_jitter4testing(bool tiny) {
#define DDBI(mc) \
(((mc)->mc_flags & C_SUB) ? -(int)(mc)->mc_dbi : (int)(mc)->mc_dbi)
/* Key size which fits in a DKBUF. */
#define DKBUF_MAXKEYSIZE 511 /* FIXME */
/* Key size which fits in a DKBUF (debug key buffer). */
#define DKBUF_MAX 511
#if MDBX_DEBUG
#define DKBUF char _kbuf[DKBUF_MAXKEYSIZE * 4 + 2]
#define DKEY(x) mdbx_dump_val(x, _kbuf, DKBUF_MAXKEYSIZE * 2 + 1)
#define DVAL(x) \
mdbx_dump_val(x, _kbuf + DKBUF_MAXKEYSIZE * 2 + 1, DKBUF_MAXKEYSIZE * 2 + 1)
#define DKBUF char _kbuf[DKBUF_MAX * 4 + 2]
#define DKEY(x) mdbx_dump_val(x, _kbuf, DKBUF_MAX * 2 + 1)
#define DVAL(x) mdbx_dump_val(x, _kbuf + DKBUF_MAX * 2 + 1, DKBUF_MAX * 2 + 1)
#else
#define DKBUF ((void)(0))
#define DKEY(x) ("-")