X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/da33edbc58282eed2d48ccb62babf39d0cb748e7..4c0c1fff5a5abebfe903251ab56176b18cfc5688:/src/aof.c?ds=sidebyside diff --git a/src/aof.c b/src/aof.c index bfa8163d..441ccaf1 100644 --- a/src/aof.c +++ b/src/aof.c @@ -12,6 +12,121 @@ void aofUpdateCurrentSize(void); +/* ---------------------------------------------------------------------------- + * AOF rewrite buffer implementation. + * + * The following code implement a simple buffer used in order to accumulate + * changes while the background process is rewriting the AOF file. + * + * We only need to append, but can't just use realloc with a large block + * because 'huge' reallocs are not always handled as one could expect + * (via remapping of pages at OS level) but may involve copying data. + * + * For this reason we use a list of blocks, every block is + * AOF_RW_BUF_BLOCK_SIZE bytes. + * ------------------------------------------------------------------------- */ + +#define AOF_RW_BUF_BLOCK_SIZE (1024*1024*10) /* 10 MB per block */ + +typedef struct aofrwblock { + unsigned long used, free; + char buf[AOF_RW_BUF_BLOCK_SIZE]; +} aofrwblock; + +/* This function free the old AOF rewrite buffer if needed, and initialize + * a fresh new one. It tests for server.aof_rewrite_buf_blocks equal to NULL + * so can be used for the first initialization as well. */ +void aofRewriteBufferReset(void) { + if (server.aof_rewrite_buf_blocks) + listRelease(server.aof_rewrite_buf_blocks); + + server.aof_rewrite_buf_blocks = listCreate(); + listSetFreeMethod(server.aof_rewrite_buf_blocks,zfree); +} + +/* Return the current size of the AOF rerwite buffer. */ +unsigned long aofRewriteBufferSize(void) { + listNode *ln = listLast(server.aof_rewrite_buf_blocks); + aofrwblock *block = ln ? ln->value : NULL; + + if (block == NULL) return 0; + unsigned long size = + (listLength(server.aof_rewrite_buf_blocks)-1) * AOF_RW_BUF_BLOCK_SIZE; + size += block->used; + return size; +} + +/* Append data to the AOF rewrite buffer, allocating new blocks if needed. */ +void aofRewriteBufferAppend(unsigned char *s, unsigned long len) { + listNode *ln = listLast(server.aof_rewrite_buf_blocks); + aofrwblock *block = ln ? ln->value : NULL; + + while(len) { + /* If we already got at least an allocated block, try appending + * at least some piece into it. */ + if (block) { + unsigned long thislen = (block->free < len) ? block->free : len; + if (thislen) { /* The current block is not already full. */ + memcpy(block->buf+block->used, s, thislen); + block->used += thislen; + block->free -= thislen; + s += thislen; + len -= thislen; + } + } + + if (len) { /* First block to allocate, or need another block. */ + int numblocks; + + block = zmalloc(sizeof(*block)); + block->free = AOF_RW_BUF_BLOCK_SIZE; + block->used = 0; + listAddNodeTail(server.aof_rewrite_buf_blocks,block); + + /* Log every time we cross more 10 or 100 blocks, respectively + * as a notice or warning. */ + numblocks = listLength(server.aof_rewrite_buf_blocks); + if (((numblocks+1) % 10) == 0) { + int level = ((numblocks+1) % 100) == 0 ? REDIS_WARNING : + REDIS_NOTICE; + redisLog(level,"Background AOF buffer size: %lu MB", + aofRewriteBufferSize()/(1024*1024)); + } + } + } +} + +/* Write the buffer (possibly composed of multiple blocks) into the specified + * fd. If no short write or any other error happens -1 is returned, + * otherwise the number of bytes written is returned. */ +ssize_t aofRewriteBufferWrite(int fd) { + listNode *ln; + listIter li; + ssize_t count = 0; + + listRewind(server.aof_rewrite_buf_blocks,&li); + while((ln = listNext(&li))) { + aofrwblock *block = listNodeValue(ln); + ssize_t nwritten; + + if (block->used) { + nwritten = write(fd,block->buf,block->used); + if (nwritten != block->used) { + if (nwritten == 0) errno = EIO; + return -1; + } + count += nwritten; + } + } + return count; +} + +/* ---------------------------------------------------------------------------- + * AOF file implementation + * ------------------------------------------------------------------------- */ + +/* Starts a background task that performs fsync() against the specified + * file descriptor (the one of the AOF file) in another thread. */ void aof_background_fsync(int fd) { bioCreateBackgroundJob(REDIS_BIO_AOF_FSYNC,(void*)(long)fd,NULL,NULL); } @@ -19,42 +134,48 @@ void aof_background_fsync(int fd) { /* Called when the user switches from "appendonly yes" to "appendonly no" * at runtime using the CONFIG command. */ void stopAppendOnly(void) { + redisAssert(server.aof_state != REDIS_AOF_OFF); flushAppendOnlyFile(1); - aof_fsync(server.appendfd); - close(server.appendfd); + aof_fsync(server.aof_fd); + close(server.aof_fd); - server.appendfd = -1; - server.appendseldb = -1; - server.appendonly = 0; + server.aof_fd = -1; + server.aof_selected_db = -1; + server.aof_state = REDIS_AOF_OFF; /* rewrite operation in progress? kill it, wait child exit */ - if (server.bgrewritechildpid != -1) { + if (server.aof_child_pid != -1) { int statloc; - if (kill(server.bgrewritechildpid,SIGKILL) != -1) + redisLog(REDIS_NOTICE,"Killing running AOF rewrite child: %ld", + (long) server.aof_child_pid); + if (kill(server.aof_child_pid,SIGKILL) != -1) wait3(&statloc,0,NULL); /* reset the buffer accumulating changes while the child saves */ - sdsfree(server.bgrewritebuf); - server.bgrewritebuf = sdsempty(); - server.bgrewritechildpid = -1; + aofRewriteBufferReset(); + aofRemoveTempFile(server.aof_child_pid); + server.aof_child_pid = -1; + server.aof_rewrite_time_start = -1; } } /* Called when the user switches from "appendonly no" to "appendonly yes" * at runtime using the CONFIG command. */ int startAppendOnly(void) { - server.appendonly = 1; - server.lastfsync = time(NULL); - server.appendfd = open(server.appendfilename,O_WRONLY|O_APPEND|O_CREAT,0644); - if (server.appendfd == -1) { - redisLog(REDIS_WARNING,"Used tried to switch on AOF via CONFIG, but I can't open the AOF file: %s",strerror(errno)); + server.aof_last_fsync = server.unixtime; + server.aof_fd = open(server.aof_filename,O_WRONLY|O_APPEND|O_CREAT,0644); + redisAssert(server.aof_state == REDIS_AOF_OFF); + if (server.aof_fd == -1) { + redisLog(REDIS_WARNING,"Redis needs to enable the AOF but can't open the append only file: %s",strerror(errno)); return REDIS_ERR; } if (rewriteAppendOnlyFileBackground() == REDIS_ERR) { - server.appendonly = 0; - close(server.appendfd); - redisLog(REDIS_WARNING,"User tried turning on AOF with CONFIG SET but I can't trigger a background AOF rewrite operation. Check the above logs for more info about the error."); + close(server.aof_fd); + redisLog(REDIS_WARNING,"Redis needs to enable the AOF but can't trigger a background AOF rewrite operation. Check the above logs for more info about the error."); return REDIS_ERR; } + /* We correctly switched on AOF, now wait for the rerwite to be complete + * in order to append data on disk. */ + server.aof_state = REDIS_AOF_WAIT_REWRITE; return REDIS_OK; } @@ -80,12 +201,12 @@ void flushAppendOnlyFile(int force) { ssize_t nwritten; int sync_in_progress = 0; - if (sdslen(server.aofbuf) == 0) return; + if (sdslen(server.aof_buf) == 0) return; - if (server.appendfsync == APPENDFSYNC_EVERYSEC) + if (server.aof_fsync == AOF_FSYNC_EVERYSEC) sync_in_progress = bioPendingJobsOfType(REDIS_BIO_AOF_FSYNC) != 0; - if (server.appendfsync == APPENDFSYNC_EVERYSEC && !force) { + if (server.aof_fsync == AOF_FSYNC_EVERYSEC && !force) { /* With this append fsync policy we do background fsyncing. * If the fsync is still in progress we can try to delay * the write for a couple of seconds. */ @@ -102,6 +223,7 @@ void flushAppendOnlyFile(int force) { } /* Otherwise fall trough, and go write since we can't wait * over two seconds. */ + server.aof_delayed_fsync++; redisLog(REDIS_NOTICE,"Asynchronous AOF fsync is taking too long (disk is busy?). Writing the AOF buffer without waiting for fsync to complete, this may slow down Redis."); } } @@ -114,45 +236,57 @@ void flushAppendOnlyFile(int force) { * While this will save us against the server being killed I don't think * there is much to do about the whole server stopping for power problems * or alike */ - nwritten = write(server.appendfd,server.aofbuf,sdslen(server.aofbuf)); - if (nwritten != (signed)sdslen(server.aofbuf)) { + nwritten = write(server.aof_fd,server.aof_buf,sdslen(server.aof_buf)); + if (nwritten != (signed)sdslen(server.aof_buf)) { /* Ooops, we are in troubles. The best thing to do for now is * aborting instead of giving the illusion that everything is * working as expected. */ if (nwritten == -1) { redisLog(REDIS_WARNING,"Exiting on error writing to the append-only file: %s",strerror(errno)); } else { - redisLog(REDIS_WARNING,"Exiting on short write while writing to the append-only file: %s",strerror(errno)); + redisLog(REDIS_WARNING,"Exiting on short write while writing to " + "the append-only file: %s (nwritten=%ld, " + "expected=%ld)", + strerror(errno), + (long)nwritten, + (long)sdslen(server.aof_buf)); + + if (ftruncate(server.aof_fd, server.aof_current_size) == -1) { + redisLog(REDIS_WARNING, "Could not remove short write " + "from the append-only file. Redis may refuse " + "to load the AOF the next time it starts. " + "ftruncate: %s", strerror(errno)); + } } exit(1); } - server.appendonly_current_size += nwritten; + server.aof_current_size += nwritten; /* Re-use AOF buffer when it is small enough. The maximum comes from the * arena size of 4k minus some overhead (but is otherwise arbitrary). */ - if ((sdslen(server.aofbuf)+sdsavail(server.aofbuf)) < 4000) { - sdsclear(server.aofbuf); + if ((sdslen(server.aof_buf)+sdsavail(server.aof_buf)) < 4000) { + sdsclear(server.aof_buf); } else { - sdsfree(server.aofbuf); - server.aofbuf = sdsempty(); + sdsfree(server.aof_buf); + server.aof_buf = sdsempty(); } /* Don't fsync if no-appendfsync-on-rewrite is set to yes and there are * children doing I/O in the background. */ - if (server.no_appendfsync_on_rewrite && - (server.bgrewritechildpid != -1 || server.bgsavechildpid != -1)) + if (server.aof_no_fsync_on_rewrite && + (server.aof_child_pid != -1 || server.rdb_child_pid != -1)) return; /* Perform the fsync if needed. */ - if (server.appendfsync == APPENDFSYNC_ALWAYS) { + if (server.aof_fsync == AOF_FSYNC_ALWAYS) { /* aof_fsync is defined as fdatasync() for Linux in order to avoid * flushing metadata. */ - aof_fsync(server.appendfd); /* Let's try to get this data on the disk */ - server.lastfsync = server.unixtime; - } else if ((server.appendfsync == APPENDFSYNC_EVERYSEC && - server.unixtime > server.lastfsync)) { - if (!sync_in_progress) aof_background_fsync(server.appendfd); - server.lastfsync = server.unixtime; + aof_fsync(server.aof_fd); /* Let's try to get this data on the disk */ + server.aof_last_fsync = server.unixtime; + } else if ((server.aof_fsync == AOF_FSYNC_EVERYSEC && + server.unixtime > server.aof_last_fsync)) { + if (!sync_in_progress) aof_background_fsync(server.aof_fd); + server.aof_last_fsync = server.unixtime; } } @@ -224,13 +358,13 @@ void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int a /* The DB this command was targetting is not the same as the last command * we appendend. To issue a SELECT command is needed. */ - if (dictid != server.appendseldb) { + if (dictid != server.aof_selected_db) { char seldb[64]; snprintf(seldb,sizeof(seldb),"%d",dictid); buf = sdscatprintf(buf,"*2\r\n$6\r\nSELECT\r\n$%lu\r\n%s\r\n", (unsigned long)strlen(seldb),seldb); - server.appendseldb = dictid; + server.aof_selected_db = dictid; } if (cmd->proc == expireCommand || cmd->proc == pexpireCommand || @@ -255,18 +389,23 @@ void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int a /* Append to the AOF buffer. This will be flushed on disk just before * of re-entering the event loop, so before the client will get a * positive reply about the operation performed. */ - server.aofbuf = sdscatlen(server.aofbuf,buf,sdslen(buf)); + if (server.aof_state == REDIS_AOF_ON) + server.aof_buf = sdscatlen(server.aof_buf,buf,sdslen(buf)); /* 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)); + if (server.aof_child_pid != -1) + aofRewriteBufferAppend((unsigned char*)buf,sdslen(buf)); sdsfree(buf); } +/* ---------------------------------------------------------------------------- + * AOF loading + * ------------------------------------------------------------------------- */ + /* In Redis commands are always executed in the context of a client, so in * order to load the append only file we need to create a fake client. */ struct redisClient *createFakeClient(void) { @@ -275,6 +414,7 @@ struct redisClient *createFakeClient(void) { selectDb(c,0); c->fd = -1; c->querybuf = sdsempty(); + c->querybuf_peak = 0; c->argc = 0; c->argv = NULL; c->bufpos = 0; @@ -283,6 +423,8 @@ struct redisClient *createFakeClient(void) { * so that Redis will not try to send replies to this client. */ c->replstate = REDIS_REPL_WAIT_BGSAVE_START; c->reply = listCreate(); + c->reply_bytes = 0; + c->obuf_soft_limit_reached_time = 0; c->watched_keys = listCreate(); listSetFreeMethod(c->reply,decrRefCount); listSetDupMethod(c->reply,dupClientReplyValue); @@ -305,11 +447,11 @@ int loadAppendOnlyFile(char *filename) { struct redisClient *fakeClient; FILE *fp = fopen(filename,"r"); struct redis_stat sb; - int appendonly = server.appendonly; + int old_aof_state = server.aof_state; long loops = 0; if (fp && redis_fstat(fileno(fp),&sb) != -1 && sb.st_size == 0) { - server.appendonly_current_size = 0; + server.aof_current_size = 0; fclose(fp); return REDIS_ERR; } @@ -321,7 +463,7 @@ int loadAppendOnlyFile(char *filename) { /* Temporarily disable AOF, to prevent EXEC from feeding a MULTI * to the same file we're about to read. */ - server.appendonly = 0; + server.aof_state = REDIS_AOF_OFF; fakeClient = createFakeClient(); startLoading(fp); @@ -390,10 +532,10 @@ int loadAppendOnlyFile(char *filename) { fclose(fp); freeFakeClient(fakeClient); - server.appendonly = appendonly; + server.aof_state = old_aof_state; stopLoading(); aofUpdateCurrentSize(); - server.auto_aofrewrite_base_size = server.appendonly_current_size; + server.aof_rewrite_base_size = server.aof_current_size; return REDIS_OK; readerr: @@ -408,6 +550,10 @@ fmterr: exit(1); } +/* ---------------------------------------------------------------------------- + * AOF rewrite + * ------------------------------------------------------------------------- */ + /* Delegate writing an object to writing a bulk string or bulk long long. * This is not placed in rio.c since that adds the redis.h dependency. */ int rioWriteBulkObject(rio *r, robj *obj) { @@ -436,8 +582,8 @@ int rewriteListObject(rio *r, robj *key, robj *o) { while(ziplistGet(p,&vstr,&vlen,&vlong)) { if (count == 0) { - int cmd_items = (items > REDIS_AOFREWRITE_ITEMS_PER_CMD) ? - REDIS_AOFREWRITE_ITEMS_PER_CMD : items; + int cmd_items = (items > REDIS_AOF_REWRITE_ITEMS_PER_CMD) ? + REDIS_AOF_REWRITE_ITEMS_PER_CMD : items; if (rioWriteBulkCount(r,'*',2+cmd_items) == 0) return 0; if (rioWriteBulkString(r,"RPUSH",5) == 0) return 0; @@ -449,7 +595,7 @@ int rewriteListObject(rio *r, robj *key, robj *o) { if (rioWriteBulkLongLong(r,vlong) == 0) return 0; } p = ziplistNext(zl,p); - if (++count == REDIS_AOFREWRITE_ITEMS_PER_CMD) count = 0; + if (++count == REDIS_AOF_REWRITE_ITEMS_PER_CMD) count = 0; items--; } } else if (o->encoding == REDIS_ENCODING_LINKEDLIST) { @@ -462,15 +608,15 @@ int rewriteListObject(rio *r, robj *key, robj *o) { robj *eleobj = listNodeValue(ln); if (count == 0) { - int cmd_items = (items > REDIS_AOFREWRITE_ITEMS_PER_CMD) ? - REDIS_AOFREWRITE_ITEMS_PER_CMD : items; + int cmd_items = (items > REDIS_AOF_REWRITE_ITEMS_PER_CMD) ? + REDIS_AOF_REWRITE_ITEMS_PER_CMD : items; if (rioWriteBulkCount(r,'*',2+cmd_items) == 0) return 0; if (rioWriteBulkString(r,"RPUSH",5) == 0) return 0; if (rioWriteBulkObject(r,key) == 0) return 0; } if (rioWriteBulkObject(r,eleobj) == 0) return 0; - if (++count == REDIS_AOFREWRITE_ITEMS_PER_CMD) count = 0; + if (++count == REDIS_AOF_REWRITE_ITEMS_PER_CMD) count = 0; items--; } } else { @@ -490,15 +636,15 @@ int rewriteSetObject(rio *r, robj *key, robj *o) { while(intsetGet(o->ptr,ii++,&llval)) { if (count == 0) { - int cmd_items = (items > REDIS_AOFREWRITE_ITEMS_PER_CMD) ? - REDIS_AOFREWRITE_ITEMS_PER_CMD : items; + int cmd_items = (items > REDIS_AOF_REWRITE_ITEMS_PER_CMD) ? + REDIS_AOF_REWRITE_ITEMS_PER_CMD : items; if (rioWriteBulkCount(r,'*',2+cmd_items) == 0) return 0; if (rioWriteBulkString(r,"SADD",4) == 0) return 0; if (rioWriteBulkObject(r,key) == 0) return 0; } if (rioWriteBulkLongLong(r,llval) == 0) return 0; - if (++count == REDIS_AOFREWRITE_ITEMS_PER_CMD) count = 0; + if (++count == REDIS_AOF_REWRITE_ITEMS_PER_CMD) count = 0; items--; } } else if (o->encoding == REDIS_ENCODING_HT) { @@ -508,15 +654,15 @@ int rewriteSetObject(rio *r, robj *key, robj *o) { while((de = dictNext(di)) != NULL) { robj *eleobj = dictGetKey(de); if (count == 0) { - int cmd_items = (items > REDIS_AOFREWRITE_ITEMS_PER_CMD) ? - REDIS_AOFREWRITE_ITEMS_PER_CMD : items; + int cmd_items = (items > REDIS_AOF_REWRITE_ITEMS_PER_CMD) ? + REDIS_AOF_REWRITE_ITEMS_PER_CMD : items; if (rioWriteBulkCount(r,'*',2+cmd_items) == 0) return 0; if (rioWriteBulkString(r,"SADD",4) == 0) return 0; if (rioWriteBulkObject(r,key) == 0) return 0; } if (rioWriteBulkObject(r,eleobj) == 0) return 0; - if (++count == REDIS_AOFREWRITE_ITEMS_PER_CMD) count = 0; + if (++count == REDIS_AOF_REWRITE_ITEMS_PER_CMD) count = 0; items--; } dictReleaseIterator(di); @@ -549,8 +695,8 @@ int rewriteSortedSetObject(rio *r, robj *key, robj *o) { score = zzlGetScore(sptr); if (count == 0) { - int cmd_items = (items > REDIS_AOFREWRITE_ITEMS_PER_CMD) ? - REDIS_AOFREWRITE_ITEMS_PER_CMD : items; + int cmd_items = (items > REDIS_AOF_REWRITE_ITEMS_PER_CMD) ? + REDIS_AOF_REWRITE_ITEMS_PER_CMD : items; if (rioWriteBulkCount(r,'*',2+cmd_items*2) == 0) return 0; if (rioWriteBulkString(r,"ZADD",4) == 0) return 0; @@ -563,7 +709,7 @@ int rewriteSortedSetObject(rio *r, robj *key, robj *o) { if (rioWriteBulkLongLong(r,vll) == 0) return 0; } zzlNext(zl,&eptr,&sptr); - if (++count == REDIS_AOFREWRITE_ITEMS_PER_CMD) count = 0; + if (++count == REDIS_AOF_REWRITE_ITEMS_PER_CMD) count = 0; items--; } } else if (o->encoding == REDIS_ENCODING_SKIPLIST) { @@ -576,8 +722,8 @@ int rewriteSortedSetObject(rio *r, robj *key, robj *o) { double *score = dictGetVal(de); if (count == 0) { - int cmd_items = (items > REDIS_AOFREWRITE_ITEMS_PER_CMD) ? - REDIS_AOFREWRITE_ITEMS_PER_CMD : items; + int cmd_items = (items > REDIS_AOF_REWRITE_ITEMS_PER_CMD) ? + REDIS_AOF_REWRITE_ITEMS_PER_CMD : items; if (rioWriteBulkCount(r,'*',2+cmd_items*2) == 0) return 0; if (rioWriteBulkString(r,"ZADD",4) == 0) return 0; @@ -585,7 +731,7 @@ int rewriteSortedSetObject(rio *r, robj *key, robj *o) { } if (rioWriteBulkDouble(r,*score) == 0) return 0; if (rioWriteBulkObject(r,eleobj) == 0) return 0; - if (++count == REDIS_AOFREWRITE_ITEMS_PER_CMD) count = 0; + if (++count == REDIS_AOF_REWRITE_ITEMS_PER_CMD) count = 0; items--; } dictReleaseIterator(di); @@ -595,53 +741,61 @@ int rewriteSortedSetObject(rio *r, robj *key, robj *o) { return 1; } +/* Write either the key or the value of the currently selected item of an hash. + * The 'hi' argument passes a valid Redis hash iterator. + * The 'what' filed specifies if to write a key or a value and can be + * either REDIS_HASH_KEY or REDIS_HASH_VALUE. + * + * The function returns 0 on error, non-zero on success. */ +static int rioWriteHashIteratorCursor(rio *r, hashTypeIterator *hi, int what) { + if (hi->encoding == REDIS_ENCODING_ZIPLIST) { + unsigned char *vstr = NULL; + unsigned int vlen = UINT_MAX; + long long vll = LLONG_MAX; + + hashTypeCurrentFromZiplist(hi, what, &vstr, &vlen, &vll); + if (vstr) { + return rioWriteBulkString(r, (char*)vstr, vlen); + } else { + return rioWriteBulkLongLong(r, vll); + } + + } else if (hi->encoding == REDIS_ENCODING_HT) { + robj *value; + + hashTypeCurrentFromHashTable(hi, what, &value); + return rioWriteBulkObject(r, value); + } + + redisPanic("Unknown hash encoding"); + return 0; +} + /* Emit the commands needed to rebuild a hash object. * The function returns 0 on error, 1 on success. */ int rewriteHashObject(rio *r, robj *key, robj *o) { + hashTypeIterator *hi; long long count = 0, items = hashTypeLength(o); - if (o->encoding == REDIS_ENCODING_ZIPMAP) { - unsigned char *p = zipmapRewind(o->ptr); - unsigned char *field, *val; - unsigned int flen, vlen; + hi = hashTypeInitIterator(o); + while (hashTypeNext(hi) != REDIS_ERR) { + if (count == 0) { + int cmd_items = (items > REDIS_AOF_REWRITE_ITEMS_PER_CMD) ? + REDIS_AOF_REWRITE_ITEMS_PER_CMD : items; - while((p = zipmapNext(p,&field,&flen,&val,&vlen)) != NULL) { - if (count == 0) { - int cmd_items = (items > REDIS_AOFREWRITE_ITEMS_PER_CMD) ? - REDIS_AOFREWRITE_ITEMS_PER_CMD : items; - - if (rioWriteBulkCount(r,'*',2+cmd_items*2) == 0) return 0; - if (rioWriteBulkString(r,"HMSET",5) == 0) return 0; - if (rioWriteBulkObject(r,key) == 0) return 0; - } - if (rioWriteBulkString(r,(char*)field,flen) == 0) return 0; - if (rioWriteBulkString(r,(char*)val,vlen) == 0) return 0; - if (++count == REDIS_AOFREWRITE_ITEMS_PER_CMD) count = 0; - items--; + if (rioWriteBulkCount(r,'*',2+cmd_items*2) == 0) return 0; + if (rioWriteBulkString(r,"HMSET",5) == 0) return 0; + if (rioWriteBulkObject(r,key) == 0) return 0; } - } else { - dictIterator *di = dictGetIterator(o->ptr); - dictEntry *de; - while((de = dictNext(di)) != NULL) { - robj *field = dictGetKey(de); - robj *val = dictGetVal(de); + if (rioWriteHashIteratorCursor(r, hi, REDIS_HASH_KEY) == 0) return 0; + if (rioWriteHashIteratorCursor(r, hi, REDIS_HASH_VALUE) == 0) return 0; + if (++count == REDIS_AOF_REWRITE_ITEMS_PER_CMD) count = 0; + items--; + } - if (count == 0) { - int cmd_items = (items > REDIS_AOFREWRITE_ITEMS_PER_CMD) ? - REDIS_AOFREWRITE_ITEMS_PER_CMD : items; + hashTypeReleaseIterator(hi); - if (rioWriteBulkCount(r,'*',2+cmd_items*2) == 0) return 0; - if (rioWriteBulkString(r,"HMSET",5) == 0) return 0; - if (rioWriteBulkObject(r,key) == 0) return 0; - } - if (rioWriteBulkObject(r,field) == 0) return 0; - if (rioWriteBulkObject(r,val) == 0) return 0; - if (++count == REDIS_AOFREWRITE_ITEMS_PER_CMD) count = 0; - items--; - } - dictReleaseIterator(di); - } return 1; } @@ -650,7 +804,7 @@ int rewriteHashObject(rio *r, robj *key, robj *o) { * * In order to minimize the number of commands needed in the rewritten * log Redis uses variadic commands when possible, such as RPUSH, SADD - * and ZADD. However at max REDIS_AOFREWRITE_ITEMS_PER_CMD items per time + * and ZADD. However at max REDIS_AOF_REWRITE_ITEMS_PER_CMD items per time * are inserted using a single command. */ int rewriteAppendOnlyFile(char *filename) { dictIterator *di = NULL; @@ -666,7 +820,7 @@ int rewriteAppendOnlyFile(char *filename) { snprintf(tmpfile,256,"temp-rewriteaof-%d.aof", (int) getpid()); fp = fopen(tmpfile,"w"); if (!fp) { - redisLog(REDIS_WARNING, "Failed rewriting the append only file: %s", strerror(errno)); + redisLog(REDIS_WARNING, "Opening the temp file for AOF rewrite in rewriteAppendOnlyFile(): %s", strerror(errno)); return REDIS_ERR; } @@ -758,10 +912,10 @@ werr: * 1) The user calls BGREWRITEAOF * 2) Redis calls this function, that forks(): * 2a) the child rewrite the append only file in a temp file. - * 2b) the parent accumulates differences in server.bgrewritebuf. + * 2b) the parent accumulates differences in server.aof_rewrite_buf. * 3) When the child finished '2a' exists. * 4) The parent will trap the exit code, if it's OK, will append the - * data accumulated into server.bgrewritebuf into the temp file, and + * data accumulated into server.aof_rewrite_buf into the temp file, and * finally will rename(2) the temp file in the actual file name. * The the new file is reopened as the new append only file. Profit! */ @@ -769,7 +923,7 @@ int rewriteAppendOnlyFileBackground(void) { pid_t childpid; long long start; - if (server.bgrewritechildpid != -1) return REDIS_ERR; + if (server.aof_child_pid != -1) return REDIS_ERR; start = ustime(); if ((childpid = fork()) == 0) { char tmpfile[256]; @@ -779,9 +933,9 @@ int rewriteAppendOnlyFileBackground(void) { if (server.sofd > 0) close(server.sofd); snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", (int) getpid()); if (rewriteAppendOnlyFile(tmpfile) == REDIS_OK) { - _exit(0); + exitFromChild(0); } else { - _exit(1); + exitFromChild(1); } } else { /* Parent */ @@ -794,24 +948,25 @@ int rewriteAppendOnlyFileBackground(void) { } redisLog(REDIS_NOTICE, "Background append only file rewriting started by pid %d",childpid); - server.aofrewrite_scheduled = 0; - server.bgrewritechildpid = childpid; + server.aof_rewrite_scheduled = 0; + server.aof_rewrite_time_start = time(NULL); + server.aof_child_pid = childpid; updateDictResizePolicy(); /* 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 + * accumulated by the parent into server.aof_rewrite_buf will start * with a SELECT statement and it will be safe to merge. */ - server.appendseldb = -1; + server.aof_selected_db = -1; return REDIS_OK; } return REDIS_OK; /* unreached */ } void bgrewriteaofCommand(redisClient *c) { - if (server.bgrewritechildpid != -1) { + if (server.aof_child_pid != -1) { addReplyError(c,"Background append only file rewriting already in progress"); - } else if (server.bgsavechildpid != -1) { - server.aofrewrite_scheduled = 1; + } else if (server.rdb_child_pid != -1) { + server.aof_rewrite_scheduled = 1; addReplyStatus(c,"Background append only file rewriting scheduled"); } else if (rewriteAppendOnlyFileBackground() == REDIS_OK) { addReplyStatus(c,"Background append only file rewriting started"); @@ -827,18 +982,18 @@ void aofRemoveTempFile(pid_t childpid) { unlink(tmpfile); } -/* Update the server.appendonly_current_size filed explicitly using stat(2) +/* Update the server.aof_current_size filed explicitly using stat(2) * to check the size of the file. This is useful after a rewrite or after * a restart, normally the size is updated just adding the write length - * to the current lenght, that is much faster. */ + * to the current length, that is much faster. */ void aofUpdateCurrentSize(void) { struct redis_stat sb; - if (redis_fstat(server.appendfd,&sb) == -1) { - redisLog(REDIS_WARNING,"Unable to check the AOF length: %s", + if (redis_fstat(server.aof_fd,&sb) == -1) { + redisLog(REDIS_WARNING,"Unable to obtain the AOF file length. stat: %s", strerror(errno)); } else { - server.appendonly_current_size = sb.st_size; + server.aof_current_size = sb.st_size; } } @@ -847,7 +1002,6 @@ void aofUpdateCurrentSize(void) { void backgroundRewriteDoneHandler(int exitcode, int bysignal) { if (!bysignal && exitcode == 0) { int newfd, oldfd; - int nwritten; char tmpfile[256]; long long now = ustime(); @@ -857,7 +1011,7 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) { /* Flush the differences accumulated by the parent to the * rewritten AOF. */ snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", - (int)server.bgrewritechildpid); + (int)server.aof_child_pid); newfd = open(tmpfile,O_WRONLY|O_APPEND); if (newfd == -1) { redisLog(REDIS_WARNING, @@ -865,21 +1019,15 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) { goto cleanup; } - nwritten = write(newfd,server.bgrewritebuf,sdslen(server.bgrewritebuf)); - if (nwritten != (signed)sdslen(server.bgrewritebuf)) { - if (nwritten == -1) { - redisLog(REDIS_WARNING, - "Error trying to flush the parent diff to the rewritten AOF: %s", strerror(errno)); - } else { - redisLog(REDIS_WARNING, - "Short write trying to flush the parent diff to the rewritten AOF: %s", strerror(errno)); - } + if (aofRewriteBufferWrite(newfd) == -1) { + redisLog(REDIS_WARNING, + "Error trying to flush the parent diff to the rewritten AOF: %s", strerror(errno)); close(newfd); goto cleanup; } redisLog(REDIS_NOTICE, - "Parent diff successfully flushed to the rewritten AOF (%lu bytes)", nwritten); + "Parent diff successfully flushed to the rewritten AOF (%lu bytes)", aofRewriteBufferSize()); /* 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 @@ -908,13 +1056,13 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) { * guarantee atomicity for this switch has already happened by then, so * we don't care what the outcome or duration of that close operation * is, as long as the file descriptor is released again. */ - if (server.appendfd == -1) { + if (server.aof_fd == -1) { /* AOF disabled */ /* 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); + oldfd = open(server.aof_filename,O_RDONLY|O_NONBLOCK); } else { /* AOF enabled */ oldfd = -1; /* We'll set this to the current AOF filedes later. */ @@ -922,37 +1070,42 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) { /* Rename the temporary file. This will not unlink the target file if * it exists, because we reference it with "oldfd". */ - if (rename(tmpfile,server.appendfilename) == -1) { + if (rename(tmpfile,server.aof_filename) == -1) { redisLog(REDIS_WARNING, - "Error trying to rename the temporary AOF: %s", strerror(errno)); + "Error trying to rename the temporary AOF file: %s", strerror(errno)); close(newfd); if (oldfd != -1) close(oldfd); goto cleanup; } - if (server.appendfd == -1) { + if (server.aof_fd == -1) { /* 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, replace the old fd with the new one. */ - oldfd = server.appendfd; - server.appendfd = newfd; - if (server.appendfsync == APPENDFSYNC_ALWAYS) + oldfd = server.aof_fd; + server.aof_fd = newfd; + if (server.aof_fsync == AOF_FSYNC_ALWAYS) aof_fsync(newfd); - else if (server.appendfsync == APPENDFSYNC_EVERYSEC) + else if (server.aof_fsync == AOF_FSYNC_EVERYSEC) aof_background_fsync(newfd); - server.appendseldb = -1; /* Make sure SELECT is re-issued */ + server.aof_selected_db = -1; /* Make sure SELECT is re-issued */ aofUpdateCurrentSize(); - server.auto_aofrewrite_base_size = server.appendonly_current_size; + server.aof_rewrite_base_size = server.aof_current_size; /* Clear regular AOF buffer since its contents was just written to * the new AOF from the background rewrite buffer. */ - sdsfree(server.aofbuf); - server.aofbuf = sdsempty(); + sdsfree(server.aof_buf); + server.aof_buf = sdsempty(); } - redisLog(REDIS_NOTICE, "Background AOF rewrite successful"); + server.aof_lastbgrewrite_status = REDIS_OK; + + redisLog(REDIS_NOTICE, "Background AOF rewrite finished successfully"); + /* Change state from WAIT_REWRITE to ON if needed */ + if (server.aof_state == REDIS_AOF_WAIT_REWRITE) + server.aof_state = REDIS_AOF_ON; /* Asynchronously close the overwritten AOF. */ if (oldfd != -1) bioCreateBackgroundJob(REDIS_BIO_CLOSE_FILE,(void*)(long)oldfd,NULL,NULL); @@ -960,16 +1113,24 @@ void backgroundRewriteDoneHandler(int exitcode, int bysignal) { redisLog(REDIS_VERBOSE, "Background AOF rewrite signal handler took %lldus", ustime()-now); } else if (!bysignal && exitcode != 0) { + server.aof_lastbgrewrite_status = REDIS_ERR; + redisLog(REDIS_WARNING, "Background AOF rewrite terminated with error"); } else { + server.aof_lastbgrewrite_status = REDIS_ERR; + redisLog(REDIS_WARNING, "Background AOF rewrite terminated by signal %d", bysignal); } cleanup: - sdsfree(server.bgrewritebuf); - server.bgrewritebuf = sdsempty(); - aofRemoveTempFile(server.bgrewritechildpid); - server.bgrewritechildpid = -1; + aofRewriteBufferReset(); + aofRemoveTempFile(server.aof_child_pid); + server.aof_child_pid = -1; + server.aof_rewrite_time_last = time(NULL)-server.aof_rewrite_time_start; + server.aof_rewrite_time_start = -1; + /* Schedule a new rewrite if we are waiting for it to switch the AOF ON. */ + if (server.aof_state == REDIS_AOF_WAIT_REWRITE) + server.aof_rewrite_scheduled = 1; }