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New RDB v7 opcode: RESIZEDB.

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The new opcode is an hint about the size of the dataset (keys and number
of expires) we are going to load for a given Redis database inside the
RDB file. Since hash tables are resized accordingly ASAP, useless
rehashing is avoided, speeding up load times significantly, in the order
of ~ 20% or more for larger data sets.

Related issue: #1719
This commit is contained in:
antirez
2015-01-07 11:08:41 +01:00
parent 32b10004e2
commit e8614a1a77
2 changed files with 26 additions and 1 deletions
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src/rdb.h
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@ -89,6 +89,7 @@
#define rdbIsObjectType(t) ((t >= 0 && t <= 4) || (t >= 9 && t <= 14))
/* Special RDB opcodes (saved/loaded with rdbSaveType/rdbLoadType). */
#define REDIS_RDB_OPCODE_RESIZEDB 251
#define REDIS_RDB_OPCODE_EXPIRETIME_MS 252
#define REDIS_RDB_OPCODE_EXPIRETIME 253
#define REDIS_RDB_OPCODE_SELECTDB 254