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AOF: sync data on disk every 32MB when rewriting.

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This prevents the kernel from putting too much stuff in the output
buffers, doing too heavy I/O all at once. So the goal of this commit is
to split the disk pressure due to the AOF rewrite process into smaller
spikes.

Please see issue #1019 for more information.
This commit is contained in:
antirez 2013-04-03 18:55:38 +02:00
parent 91f4213ddf
commit 336d722fba
2 changed files with 2 additions and 0 deletions
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1
src/aof.c
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@ -855,6 +855,7 @@ int rewriteAppendOnlyFile(char *filename) {
} }
rioInitWithFile(&aof,fp); rioInitWithFile(&aof,fp);
rioSetAutoSync(&aof,REDIS_AOF_AUTOSYNC_BYTES);
for (j = 0; j < server.dbnum; j++) { for (j = 0; j < server.dbnum; j++) {
char selectcmd[] = "*2\r\n$6\r\nSELECT\r\n"; char selectcmd[] = "*2\r\n$6\r\nSELECT\r\n";
redisDb *db = server.db+j; redisDb *db = server.db+j;

1
src/redis.h
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@ -106,6 +106,7 @@
#define REDIS_INLINE_MAX_SIZE (1024*64) /* Max size of inline reads */ #define REDIS_INLINE_MAX_SIZE (1024*64) /* Max size of inline reads */
#define REDIS_MBULK_BIG_ARG (1024*32) #define REDIS_MBULK_BIG_ARG (1024*32)
#define REDIS_LONGSTR_SIZE 21 /* Bytes needed for long -> str */ #define REDIS_LONGSTR_SIZE 21 /* Bytes needed for long -> str */
#define REDIS_AOF_AUTOSYNC_BYTES (1024*1024*32) /* fdatasync every 32MB */
/* Hash table parameters */ /* Hash table parameters */
#define REDIS_HT_MINFILL 10 /* Minimal hash table fill 10% */ #define REDIS_HT_MINFILL 10 /* Minimal hash table fill 10% */