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append only file fixes

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antirez 2009-11-26 19:03:32 +01:00
parent 9d65a1bbae
commit 85a831729f
1 changed files with 15 additions and 2 deletions
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17
redis.c
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@ -924,6 +924,7 @@ void backgroundRewriteDoneHandler(int statloc) {
close(server.appendfd);
server.appendfd = fd;
fsync(fd);
server.appendseldb = -1; /* Make sure it will issue SELECT */
redisLog(REDIS_NOTICE,"The new append only file was selected for future appends.");
} else {
/* If append only is disabled we just generate a dump in this
@ -5656,6 +5657,14 @@ static void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv
}
exit(1);
}
/* If a background append only file rewriting is in progress we want to
* accumulate the differences between the child DB and the current one
* in a buffer, so that when the child process will do its work we
* can append the differences to the new append only file. */
if (server.bgrewritechildpid != -1)
server.bgrewritebuf = sdscatlen(server.bgrewritebuf,buf,sdslen(buf));
sdsfree(buf);
now = time(NULL);
if (server.appendfsync == APPENDFSYNC_ALWAYS ||
(server.appendfsync == APPENDFSYNC_EVERYSEC &&
@ -5845,7 +5854,7 @@ static int rewriteAppendOnlyFile(char *filename) {
/* SELECT the new DB */
if (fwrite(selectcmd,sizeof(selectcmd)-1,1,fp) == 0) goto werr;
if (fwriteBulkLong(fp,j+1) == 0) goto werr;
if (fwriteBulkLong(fp,j) == 0) goto werr;
/* Iterate this DB writing every entry */
while((de = dictNext(di)) != NULL) {
@ -5854,7 +5863,6 @@ static int rewriteAppendOnlyFile(char *filename) {
time_t expiretime = getExpire(db,key);
/* Save the key and associated value */
if (rdbSaveStringObject(fp,key) == -1) goto werr;
if (o->type == REDIS_STRING) {
/* Emit a SET command */
char cmd[]="*3\r\n$3\r\nSET\r\n";
@ -5985,6 +5993,11 @@ static int rewriteAppendOnlyFileBackground(void) {
redisLog(REDIS_NOTICE,
"Background append only file rewriting started by pid %d",childpid);
server.bgrewritechildpid = childpid;
/* We set appendseldb to -1 in order to force the next call to the
* feedAppendOnlyFile() to issue a SELECT command, so the differences
* accumulated by the parent into server.bgrewritebuf will start
* with a SELECT statement and it will be safe to merge. */
server.appendseldb = -1;
return REDIS_OK;
}
return REDIS_OK; /* unreached */