fluencelabs/redis
1
0
Fork 0
mirror of https://github.com/fluencelabs/redis synced 2025-03-18 00:20:50 +00:00
Code Issues Projects Releases Wiki Activity

use bio.c instead of libeio for closing the AOF file in background. Some comment added and other minor changes.

Browse Source
This commit is contained in:
antirez 2011-09-13 18:27:08 +02:00
parent b454056d94
commit 986630afad
1 changed files with 20 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
src/aof.c
View File

@ -1,4 +1,5 @@
#include "redis.h"
#include "bio.h"
#include <signal.h>
#include <fcntl.h>
@ -677,8 +678,10 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) {
redisLog(REDIS_NOTICE,
"Background AOF rewrite terminated with success");
/* Flush the differences accumulated by the parent to the rewritten AOF. */
snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", (int)server.bgrewritechildpid);
/* Flush the differences accumulated by the parent to the
* rewritten AOF. */
snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof",
(int)server.bgrewritechildpid);
newfd = open(tmpfile,O_WRONLY|O_APPEND);
if (newfd == -1) {
redisLog(REDIS_WARNING,
@ -704,7 +707,10 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) {
/* The only remaining thing to do is to rename the temporary file to
* the configured file and switch the file descriptor used to do AOF
* writes. There are two possible scenarios:
* writes. We don't want close(2) or rename(2) calls to block the
* server on old file deletion.
*
* There are two possible scenarios:
*
* 1) AOF is DISABLED and this was a one time rewrite. The temporary
* file will be renamed to the configured file. When this file already
@ -719,7 +725,7 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) {
*
* To mitigate the blocking effect of the unlink operation (either
* caused by rename(2) in scenario 1, or by close(2) in scenario 2), we
* use a background thread in libeio to take care of this. First, we
* use a background thread to take care of this. First, we
* make scenario 1 identical to scenario 2 by opening the target file
* when it exists. The unlink operation after the rename(2) will then
* be executed upon calling close(2) for its descriptor. Everything to
@ -728,19 +734,14 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) {
* is, as long as the file descriptor is released again. */
if (server.appendfd == -1) {
/* AOF disabled */
struct stat st;
/* Check if the configured filename exists. If so, we need to open
* it to prevent rename(2) from unlinking it. */
if (stat(server.appendfilename, &st) == ENOENT) {
oldfd = -1;
} else {
/* Don't care if this fails: oldfd will be -1. */
oldfd = open(server.appendfilename,O_RDONLY|O_NONBLOCK);
}
/* Don't care if this fails: oldfd will be -1 and we handle that.
* One notable case of -1 return is if the old file does
* not exist. */
oldfd = open(server.appendfilename,O_RDONLY|O_NONBLOCK);
} else {
/* AOF enabled */
oldfd = -1;
oldfd = -1; /* We'll set this to the current AOF filedes later. */
}
/* Rename the temporary file. This will not unlink the target file if
@ -749,16 +750,16 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) {
redisLog(REDIS_WARNING,
"Error trying to rename the temporary AOF: %s", strerror(errno));
close(newfd);
if (oldfd != -1)
close(oldfd);
if (oldfd != -1) close(oldfd);
goto cleanup;
}
if (server.appendfd == -1) {
/* AOF disabled */
/* AOF disabled, we don't need to set the AOF file descriptor
* to this new file, so we can close it. */
close(newfd);
} else {
/* AOF enabled */
/* AOF enabled, replace the old fd with the new one. */
oldfd = server.appendfd;
server.appendfd = newfd;
if (server.appendfsync != APPENDFSYNC_NO) aof_fsync(newfd);
@ -770,7 +771,7 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) {
redisLog(REDIS_NOTICE, "Background AOF rewrite successful");
/* Asynchronously close the overwritten AOF. */
if (oldfd != -1) eio_close(oldfd, 0, NULL, 0);
if (oldfd != -1) bioCreateBackgroundJob(REDIS_BIO_CLOSE_FILE,(void*)(long)oldfd);
redisLog(REDIS_VERBOSE,
"Background AOF rewrite signal handler took %lldus", ustime()-now);