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RDB v8: new ZSET storage format with binary doubles.

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This commit is contained in:
antirez 2016-06-01 11:55:47 +02:00
parent 4aae4f7d35
commit e6554bed92
2 changed files with 27 additions and 5 deletions
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29
src/rdb.c
View File

@ -520,6 +520,22 @@ int rdbLoadDoubleValue(rio *rdb, double *val) {
}
}
/* Saves a double for RDB 8 or greater, where IE754 binary64 format is assumed.
* We just make sure the integer is always stored in little endian, otherwise
* the value is copied verbatim from memory to disk. */
int rdbSaveBinaryDoubleValue(rio *rdb, double val) {
memrev64ifbe(&val);
return rdbWriteRaw(rdb,&val,8);
}
/* Loads a double from RDB 8 or greater. See rdbSaveBinaryDoubleValue() for
* more info. */
int rdbLoadBinaryDoubleValue(rio *rdb, double *val) {
if (rioRead(rdb,val,8) == 0) return -1;
memrev64ifbe(val);
return 0;
}
/* Save the object type of object "o". */
int rdbSaveObjectType(rio *rdb, robj *o) {
switch (o->type) {
@ -541,7 +557,7 @@ int rdbSaveObjectType(rio *rdb, robj *o) {
if (o->encoding == OBJ_ENCODING_ZIPLIST)
return rdbSaveType(rdb,RDB_TYPE_ZSET_ZIPLIST);
else if (o->encoding == OBJ_ENCODING_SKIPLIST)
return rdbSaveType(rdb,RDB_TYPE_ZSET);
return rdbSaveType(rdb,RDB_TYPE_ZSET_2);
else
serverPanic("Unknown sorted set encoding");
case OBJ_HASH:
@ -644,7 +660,7 @@ ssize_t rdbSaveObject(rio *rdb, robj *o) {
if ((n = rdbSaveRawString(rdb,(unsigned char*)ele,sdslen(ele)))
== -1) return -1;
nwritten += n;
if ((n = rdbSaveDoubleValue(rdb,*score)) == -1) return -1;
if ((n = rdbSaveBinaryDoubleValue(rdb,*score)) == -1) return -1;
nwritten += n;
}
dictReleaseIterator(di);
@ -1041,7 +1057,7 @@ robj *rdbLoadObject(int rdbtype, rio *rdb) {
sdsfree(sdsele);
}
}
} else if (rdbtype == RDB_TYPE_ZSET) {
} else if (rdbtype == RDB_TYPE_ZSET_2 || rdbtype == RDB_TYPE_ZSET) {
/* Read list/set value. */
size_t zsetlen;
size_t maxelelen = 0;
@ -1059,7 +1075,12 @@ robj *rdbLoadObject(int rdbtype, rio *rdb) {
if ((sdsele = rdbGenericLoadStringObject(rdb,RDB_LOAD_SDS)) == NULL)
return NULL;
if (rdbLoadDoubleValue(rdb,&score) == -1) return NULL;
if (rdbtype == RDB_TYPE_ZSET_2) {
if (rdbLoadBinaryDoubleValue(rdb,&score) == -1) return NULL;
} else {
if (rdbLoadDoubleValue(rdb,&score) == -1) return NULL;
}
/* Don't care about integer-encoded strings. */
if (sdslen(sdsele) > maxelelen) maxelelen = sdslen(sdsele);

3
src/rdb.h
View File

@ -76,6 +76,7 @@
#define RDB_TYPE_SET 2
#define RDB_TYPE_ZSET 3
#define RDB_TYPE_HASH 4
#define RDB_TYPE_ZSET_2 5 /* ZSET version 2 with doubles stored in binary. */
/* NOTE: WHEN ADDING NEW RDB TYPE, UPDATE rdbIsObjectType() BELOW */
/* Object types for encoded objects. */
@ -88,7 +89,7 @@
/* NOTE: WHEN ADDING NEW RDB TYPE, UPDATE rdbIsObjectType() BELOW */
/* Test if a type is an object type. */
#define rdbIsObjectType(t) ((t >= 0 && t <= 4) || (t >= 9 && t <= 14))
#define rdbIsObjectType(t) ((t >= 0 && t <= 5) || (t >= 9 && t <= 14))
/* Special RDB opcodes (saved/loaded with rdbSaveType/rdbLoadType). */
#define RDB_OPCODE_AUX 250