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

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antirez 2011-09-13 18:27:08 +02:00
parent b454056d94
commit 986630afad
1 changed files with 20 additions and 19 deletions
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39
src/aof.c
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@ -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);