Fix for ZUNIONSTORE bug when there is an empty set among input sets. Regression test...

[redis.git] / src / rdb.c

diff --git a/src/rdb.c b/src/rdb.c
index a401a5b9dd2d5e59c525796c3be63fe22aeeb950..eeafc053d30fbbcf4471ee935f3b562cfb6a28b6 100644 (file)
--- a/src/rdb.c
+++ b/src/rdb.c
@@ -7,39 +7,51 @@
 #include <sys/resource.h>
 #include <sys/wait.h>
 #include <arpa/inet.h>
 #include <sys/resource.h>
 #include <sys/wait.h>
 #include <arpa/inet.h>

+#include <sys/stat.h>
+
+/* Convenience wrapper around fwrite, that returns the number of bytes written
+ * to the file instead of the number of objects (see fwrite(3)) and -1 in the
+ * case of an error. It also supports a NULL *fp to skip writing altogether
+ * instead of writing to /dev/null. */
+static int rdbWriteRaw(FILE *fp, void *p, size_t len) {
+    if (fp != NULL && fwrite(p,len,1,fp) == 0) return -1;
+    return len;
+}

 
 int rdbSaveType(FILE *fp, unsigned char type) {
 
 int rdbSaveType(FILE *fp, unsigned char type) {

-    if (fwrite(&type,1,1,fp) == 0) return -1;
-    return 0;
+    return rdbWriteRaw(fp,&type,1);

 }
 
 int rdbSaveTime(FILE *fp, time_t t) {
     int32_t t32 = (int32_t) t;
 }
 
 int rdbSaveTime(FILE *fp, time_t t) {
     int32_t t32 = (int32_t) t;

-    if (fwrite(&t32,4,1,fp) == 0) return -1;
-    return 0;
+    return rdbWriteRaw(fp,&t32,4);

 }
 
 /* check rdbLoadLen() comments for more info */
 int rdbSaveLen(FILE *fp, uint32_t len) {
     unsigned char buf[2];
 }
 
 /* check rdbLoadLen() comments for more info */
 int rdbSaveLen(FILE *fp, uint32_t len) {
     unsigned char buf[2];

+    int nwritten;

 
     if (len < (1<<6)) {
         /* Save a 6 bit len */
         buf[0] = (len&0xFF)|(REDIS_RDB_6BITLEN<<6);
 
     if (len < (1<<6)) {
         /* Save a 6 bit len */
         buf[0] = (len&0xFF)|(REDIS_RDB_6BITLEN<<6);

-        if (fwrite(buf,1,1,fp) == 0) return -1;
+        if (rdbWriteRaw(fp,buf,1) == -1) return -1;
+        nwritten = 1;

     } else if (len < (1<<14)) {
         /* Save a 14 bit len */
         buf[0] = ((len>>8)&0xFF)|(REDIS_RDB_14BITLEN<<6);
         buf[1] = len&0xFF;
     } else if (len < (1<<14)) {
         /* Save a 14 bit len */
         buf[0] = ((len>>8)&0xFF)|(REDIS_RDB_14BITLEN<<6);
         buf[1] = len&0xFF;

-        if (fwrite(buf,2,1,fp) == 0) return -1;
+        if (rdbWriteRaw(fp,buf,2) == -1) return -1;
+        nwritten = 2;

     } else {
         /* Save a 32 bit len */
         buf[0] = (REDIS_RDB_32BITLEN<<6);
     } else {
         /* Save a 32 bit len */
         buf[0] = (REDIS_RDB_32BITLEN<<6);

-        if (fwrite(buf,1,1,fp) == 0) return -1;
+        if (rdbWriteRaw(fp,buf,1) == -1) return -1;

         len = htonl(len);
         len = htonl(len);

-        if (fwrite(&len,4,1,fp) == 0) return -1;
+        if (rdbWriteRaw(fp,&len,4) == -1) return -1;
+        nwritten = 1+4;

     }
     }

-    return 0;
+    return nwritten;

 }
 
 /* Encode 'value' as an integer if possible (if integer will fit the
 }
 
 /* Encode 'value' as an integer if possible (if integer will fit the


@@ -92,6 +104,7 @@ int rdbTryIntegerEncoding(char *s, size_t len, unsigned char *enc) {
 int rdbSaveLzfStringObject(FILE *fp, unsigned char *s, size_t len) {
     size_t comprlen, outlen;
     unsigned char byte;
 int rdbSaveLzfStringObject(FILE *fp, unsigned char *s, size_t len) {
     size_t comprlen, outlen;
     unsigned char byte;

+    int n, nwritten = 0;

     void *out;
 
     /* We require at least four bytes compression for this to be worth it */
     void *out;
 
     /* We require at least four bytes compression for this to be worth it */


@@ -105,12 +118,20 @@ int rdbSaveLzfStringObject(FILE *fp, unsigned char *s, size_t len) {
     }
     /* Data compressed! Let's save it on disk */
     byte = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_LZF;
     }
     /* Data compressed! Let's save it on disk */
     byte = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_LZF;

-    if (fwrite(&byte,1,1,fp) == 0) goto writeerr;
-    if (rdbSaveLen(fp,comprlen) == -1) goto writeerr;
-    if (rdbSaveLen(fp,len) == -1) goto writeerr;
-    if (fwrite(out,comprlen,1,fp) == 0) goto writeerr;
+    if ((n = rdbWriteRaw(fp,&byte,1)) == -1) goto writeerr;
+    nwritten += n;
+
+    if ((n = rdbSaveLen(fp,comprlen)) == -1) goto writeerr;
+    nwritten += n;
+
+    if ((n = rdbSaveLen(fp,len)) == -1) goto writeerr;
+    nwritten += n;
+
+    if ((n = rdbWriteRaw(fp,out,comprlen)) == -1) goto writeerr;
+    nwritten += n;
+

     zfree(out);
     zfree(out);

-    return comprlen;
+    return nwritten;

 
 writeerr:
     zfree(out);
 
 writeerr:
     zfree(out);


@@ -118,50 +139,56 @@ writeerr:
 }
 
 /* Save a string objet as [len][data] on disk. If the object is a string
 }
 
 /* Save a string objet as [len][data] on disk. If the object is a string

- * representation of an integer value we try to safe it in a special form */
+ * representation of an integer value we try to save it in a special form */

 int rdbSaveRawString(FILE *fp, unsigned char *s, size_t len) {
     int enclen;
 int rdbSaveRawString(FILE *fp, unsigned char *s, size_t len) {
     int enclen;

+    int n, nwritten = 0;

 
     /* Try integer encoding */
     if (len <= 11) {
         unsigned char buf[5];
         if ((enclen = rdbTryIntegerEncoding((char*)s,len,buf)) > 0) {
 
     /* Try integer encoding */
     if (len <= 11) {
         unsigned char buf[5];
         if ((enclen = rdbTryIntegerEncoding((char*)s,len,buf)) > 0) {

-            if (fwrite(buf,enclen,1,fp) == 0) return -1;
-            return 0;
+            if (rdbWriteRaw(fp,buf,enclen) == -1) return -1;
+            return enclen;

         }
     }
 
     /* Try LZF compression - under 20 bytes it's unable to compress even
      * aaaaaaaaaaaaaaaaaa so skip it */
     if (server.rdbcompression && len > 20) {
         }
     }
 
     /* Try LZF compression - under 20 bytes it's unable to compress even
      * aaaaaaaaaaaaaaaaaa so skip it */
     if (server.rdbcompression && len > 20) {

-        int retval;
-
-        retval = rdbSaveLzfStringObject(fp,s,len);
-        if (retval == -1) return -1;
-        if (retval > 0) return 0;
-        /* retval == 0 means data can't be compressed, save the old way */
+        n = rdbSaveLzfStringObject(fp,s,len);
+        if (n == -1) return -1;
+        if (n > 0) return n;
+        /* Return value of 0 means data can't be compressed, save the old way */

     }
 
     /* Store verbatim */
     }
 
     /* Store verbatim */

-    if (rdbSaveLen(fp,len) == -1) return -1;
-    if (len && fwrite(s,len,1,fp) == 0) return -1;
-    return 0;
+    if ((n = rdbSaveLen(fp,len)) == -1) return -1;
+    nwritten += n;
+    if (len > 0) {
+        if (rdbWriteRaw(fp,s,len) == -1) return -1;
+        nwritten += len;
+    }
+    return nwritten;

 }
 
 /* Save a long long value as either an encoded string or a string. */
 int rdbSaveLongLongAsStringObject(FILE *fp, long long value) {
     unsigned char buf[32];
 }
 
 /* Save a long long value as either an encoded string or a string. */
 int rdbSaveLongLongAsStringObject(FILE *fp, long long value) {
     unsigned char buf[32];

+    int n, nwritten = 0;

     int enclen = rdbEncodeInteger(value,buf);
     if (enclen > 0) {
     int enclen = rdbEncodeInteger(value,buf);
     if (enclen > 0) {

-        if (fwrite(buf,enclen,1,fp) == 0) return -1;
+        return rdbWriteRaw(fp,buf,enclen);

     } else {
         /* Encode as string */
         enclen = ll2string((char*)buf,32,value);
         redisAssert(enclen < 32);
     } else {
         /* Encode as string */
         enclen = ll2string((char*)buf,32,value);
         redisAssert(enclen < 32);

-        if (rdbSaveLen(fp,enclen) == -1) return -1;
-        if (fwrite(buf,enclen,1,fp) == 0) return -1;
+        if ((n = rdbSaveLen(fp,enclen)) == -1) return -1;
+        nwritten += n;
+        if ((n = rdbWriteRaw(fp,buf,enclen)) == -1) return -1;
+        nwritten += n;

     }
     }

-    return 0;
+    return nwritten;

 }
 
 /* Like rdbSaveStringObjectRaw() but handle encoded objects */
 }
 
 /* Like rdbSaveStringObjectRaw() but handle encoded objects */


@@ -215,45 +242,37 @@ int rdbSaveDoubleValue(FILE *fp, double val) {
         buf[0] = strlen((char*)buf+1);
         len = buf[0]+1;
     }
         buf[0] = strlen((char*)buf+1);
         len = buf[0]+1;
     }

-    if (fwrite(buf,len,1,fp) == 0) return -1;
-    return 0;
+    return rdbWriteRaw(fp,buf,len);

 }
 
 }
 

-/* Save a Redis object. */
+/* Save a Redis object. Returns -1 on error, 0 on success. */

 int rdbSaveObject(FILE *fp, robj *o) {
 int rdbSaveObject(FILE *fp, robj *o) {

+    int n, nwritten = 0;
+

     if (o->type == REDIS_STRING) {
         /* Save a string value */
     if (o->type == REDIS_STRING) {
         /* Save a string value */

-        if (rdbSaveStringObject(fp,o) == -1) return -1;
+        if ((n = rdbSaveStringObject(fp,o)) == -1) return -1;
+        nwritten += n;

     } else if (o->type == REDIS_LIST) {
         /* Save a list value */
         if (o->encoding == REDIS_ENCODING_ZIPLIST) {
     } else if (o->type == REDIS_LIST) {
         /* Save a list value */
         if (o->encoding == REDIS_ENCODING_ZIPLIST) {

-            unsigned char *p;
-            unsigned char *vstr;
-            unsigned int vlen;
-            long long vlong;
-
-            if (rdbSaveLen(fp,ziplistLen(o->ptr)) == -1) return -1;
-            p = ziplistIndex(o->ptr,0);
-            while(ziplistGet(p,&vstr,&vlen,&vlong)) {
-                if (vstr) {
-                    if (rdbSaveRawString(fp,vstr,vlen) == -1)
-                        return -1;
-                } else {
-                    if (rdbSaveLongLongAsStringObject(fp,vlong) == -1)
-                        return -1;
-                }
-                p = ziplistNext(o->ptr,p);
-            }
+            size_t l = ziplistBlobLen((unsigned char*)o->ptr);
+
+            if ((n = rdbSaveRawString(fp,o->ptr,l)) == -1) return -1;
+            nwritten += n;

         } else if (o->encoding == REDIS_ENCODING_LINKEDLIST) {
             list *list = o->ptr;
             listIter li;
             listNode *ln;
 
         } else if (o->encoding == REDIS_ENCODING_LINKEDLIST) {
             list *list = o->ptr;
             listIter li;
             listNode *ln;
 

-            if (rdbSaveLen(fp,listLength(list)) == -1) return -1;
+            if ((n = rdbSaveLen(fp,listLength(list))) == -1) return -1;
+            nwritten += n;
+

             listRewind(list,&li);
             while((ln = listNext(&li))) {
                 robj *eleobj = listNodeValue(ln);
             listRewind(list,&li);
             while((ln = listNext(&li))) {
                 robj *eleobj = listNodeValue(ln);

-                if (rdbSaveStringObject(fp,eleobj) == -1) return -1;
+                if ((n = rdbSaveStringObject(fp,eleobj)) == -1) return -1;
+                nwritten += n;

             }
         } else {
             redisPanic("Unknown list encoding");
             }
         } else {
             redisPanic("Unknown list encoding");


@@ -265,88 +284,124 @@ int rdbSaveObject(FILE *fp, robj *o) {
             dictIterator *di = dictGetIterator(set);
             dictEntry *de;
 
             dictIterator *di = dictGetIterator(set);
             dictEntry *de;
 

-            if (rdbSaveLen(fp,dictSize(set)) == -1) return -1;
+            if ((n = rdbSaveLen(fp,dictSize(set))) == -1) return -1;
+            nwritten += n;
+

             while((de = dictNext(di)) != NULL) {
                 robj *eleobj = dictGetEntryKey(de);
             while((de = dictNext(di)) != NULL) {
                 robj *eleobj = dictGetEntryKey(de);

-                if (rdbSaveStringObject(fp,eleobj) == -1) return -1;
+                if ((n = rdbSaveStringObject(fp,eleobj)) == -1) return -1;
+                nwritten += n;

             }
             dictReleaseIterator(di);
         } else if (o->encoding == REDIS_ENCODING_INTSET) {
             }
             dictReleaseIterator(di);
         } else if (o->encoding == REDIS_ENCODING_INTSET) {

-            intset *is = o->ptr;
-            int64_t llval;
-            int i = 0;
+            size_t l = intsetBlobLen((intset*)o->ptr);

 
 

-            if (rdbSaveLen(fp,intsetLen(is)) == -1) return -1;
-            while(intsetGet(is,i++,&llval)) {
-                if (rdbSaveLongLongAsStringObject(fp,llval) == -1) return -1;
-            }
+            if ((n = rdbSaveRawString(fp,o->ptr,l)) == -1) return -1;
+            nwritten += n;

         } else {
             redisPanic("Unknown set encoding");
         }
     } else if (o->type == REDIS_ZSET) {
         } else {
             redisPanic("Unknown set encoding");
         }
     } else if (o->type == REDIS_ZSET) {

-        /* Save a set value */
-        zset *zs = o->ptr;
-        dictIterator *di = dictGetIterator(zs->dict);
-        dictEntry *de;
+        /* Save a sorted set value */
+        if (o->encoding == REDIS_ENCODING_ZIPLIST) {
+            size_t l = ziplistBlobLen((unsigned char*)o->ptr);

 
 

-        if (rdbSaveLen(fp,dictSize(zs->dict)) == -1) return -1;
-        while((de = dictNext(di)) != NULL) {
-            robj *eleobj = dictGetEntryKey(de);
-            double *score = dictGetEntryVal(de);
+            if ((n = rdbSaveRawString(fp,o->ptr,l)) == -1) return -1;
+            nwritten += n;
+        } else if (o->encoding == REDIS_ENCODING_SKIPLIST) {
+            zset *zs = o->ptr;
+            dictIterator *di = dictGetIterator(zs->dict);
+            dictEntry *de;
+
+            if ((n = rdbSaveLen(fp,dictSize(zs->dict))) == -1) return -1;
+            nwritten += n;

 
 

-            if (rdbSaveStringObject(fp,eleobj) == -1) return -1;
-            if (rdbSaveDoubleValue(fp,*score) == -1) return -1;
+            while((de = dictNext(di)) != NULL) {
+                robj *eleobj = dictGetEntryKey(de);
+                double *score = dictGetEntryVal(de);
+
+                if ((n = rdbSaveStringObject(fp,eleobj)) == -1) return -1;
+                nwritten += n;
+                if ((n = rdbSaveDoubleValue(fp,*score)) == -1) return -1;
+                nwritten += n;
+            }
+            dictReleaseIterator(di);
+        } else {
+            redisPanic("Unknown sorted set encoding");

         }
         }

-        dictReleaseIterator(di);

     } else if (o->type == REDIS_HASH) {
         /* Save a hash value */
         if (o->encoding == REDIS_ENCODING_ZIPMAP) {
     } else if (o->type == REDIS_HASH) {
         /* Save a hash value */
         if (o->encoding == REDIS_ENCODING_ZIPMAP) {

-            unsigned char *p = zipmapRewind(o->ptr);
-            unsigned int count = zipmapLen(o->ptr);
-            unsigned char *key, *val;
-            unsigned int klen, vlen;
-
-            if (rdbSaveLen(fp,count) == -1) return -1;
-            while((p = zipmapNext(p,&key,&klen,&val,&vlen)) != NULL) {
-                if (rdbSaveRawString(fp,key,klen) == -1) return -1;
-                if (rdbSaveRawString(fp,val,vlen) == -1) return -1;
-            }
+            size_t l = zipmapBlobLen((unsigned char*)o->ptr);
+
+            if ((n = rdbSaveRawString(fp,o->ptr,l)) == -1) return -1;
+            nwritten += n;

         } else {
             dictIterator *di = dictGetIterator(o->ptr);
             dictEntry *de;
 
         } else {
             dictIterator *di = dictGetIterator(o->ptr);
             dictEntry *de;
 

-            if (rdbSaveLen(fp,dictSize((dict*)o->ptr)) == -1) return -1;
+            if ((n = rdbSaveLen(fp,dictSize((dict*)o->ptr))) == -1) return -1;
+            nwritten += n;
+

             while((de = dictNext(di)) != NULL) {
                 robj *key = dictGetEntryKey(de);
                 robj *val = dictGetEntryVal(de);
 
             while((de = dictNext(di)) != NULL) {
                 robj *key = dictGetEntryKey(de);
                 robj *val = dictGetEntryVal(de);
 

-                if (rdbSaveStringObject(fp,key) == -1) return -1;
-                if (rdbSaveStringObject(fp,val) == -1) return -1;
+                if ((n = rdbSaveStringObject(fp,key)) == -1) return -1;
+                nwritten += n;
+                if ((n = rdbSaveStringObject(fp,val)) == -1) return -1;
+                nwritten += n;

             }
             dictReleaseIterator(di);
         }
     } else {
         redisPanic("Unknown object type");
     }
             }
             dictReleaseIterator(di);
         }
     } else {
         redisPanic("Unknown object type");
     }

-    return 0;
+    return nwritten;

 }
 
 /* Return the length the object will have on disk if saved with
  * the rdbSaveObject() function. Currently we use a trick to get
  * this length with very little changes to the code. In the future
  * we could switch to a faster solution. */
 }
 
 /* Return the length the object will have on disk if saved with
  * the rdbSaveObject() function. Currently we use a trick to get
  * this length with very little changes to the code. In the future
  * we could switch to a faster solution. */

-off_t rdbSavedObjectLen(robj *o, FILE *fp) {
-    if (fp == NULL) fp = server.devnull;
-    rewind(fp);
-    redisAssert(rdbSaveObject(fp,o) != 1);
-    return ftello(fp);
+off_t rdbSavedObjectLen(robj *o) {
+    int len = rdbSaveObject(NULL,o);
+    redisAssert(len != -1);
+    return len;

 }
 
 }
 

-/* Return the number of pages required to save this object in the swap file */
-off_t rdbSavedObjectPages(robj *o, FILE *fp) {
-    off_t bytes = rdbSavedObjectLen(o,fp);
-
-    return (bytes+(server.vm_page_size-1))/server.vm_page_size;
+/* Save a key-value pair, with expire time, type, key, value.
+ * On error -1 is returned.
+ * On success if the key was actaully saved 1 is returned, otherwise 0
+ * is returned (the key was already expired). */
+int rdbSaveKeyValuePair(FILE *fp, robj *key, robj *val,
+                        time_t expiretime, time_t now)
+{
+    int vtype;
+
+    /* Save the expire time */
+    if (expiretime != -1) {
+        /* If this key is already expired skip it */
+        if (expiretime < now) return 0;
+        if (rdbSaveType(fp,REDIS_EXPIRETIME) == -1) return -1;
+        if (rdbSaveTime(fp,expiretime) == -1) return -1;
+    }
+    /* Fix the object type if needed, to support saving zipmaps, ziplists,
+     * and intsets, directly as blobs of bytes: they are already serialized. */
+    vtype = val->type;
+    if (vtype == REDIS_HASH && val->encoding == REDIS_ENCODING_ZIPMAP)
+        vtype = REDIS_HASH_ZIPMAP;
+    else if (vtype == REDIS_LIST && val->encoding == REDIS_ENCODING_ZIPLIST)
+        vtype = REDIS_LIST_ZIPLIST;
+    else if (vtype == REDIS_SET && val->encoding == REDIS_ENCODING_INTSET)
+        vtype = REDIS_SET_INTSET;
+    else if (vtype == REDIS_ZSET && val->encoding == REDIS_ENCODING_ZIPLIST)
+        vtype = REDIS_ZSET_ZIPLIST;
+    /* Save type, key, value */
+    if (rdbSaveType(fp,vtype) == -1) return -1;
+    if (rdbSaveStringObject(fp,key) == -1) return -1;
+    if (rdbSaveObject(fp,val) == -1) return -1;
+    return 1;

 }
 
 /* Save the DB on disk. Return REDIS_ERR on error, REDIS_OK on success */
 }
 
 /* Save the DB on disk. Return REDIS_ERR on error, REDIS_OK on success */


@@ -358,19 +413,19 @@ int rdbSave(char *filename) {
     int j;
     time_t now = time(NULL);
 
     int j;
     time_t now = time(NULL);
 

-    /* Wait for I/O therads to terminate, just in case this is a
-     * foreground-saving, to avoid seeking the swap file descriptor at the
-     * same time. */
-    if (server.vm_enabled)
-        waitEmptyIOJobsQueue();
+    if (server.ds_enabled) {
+        cacheForcePointInTime();
+        return dsRdbSave(filename);
+    }

 
     snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
     fp = fopen(tmpfile,"w");
     if (!fp) {
 
     snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
     fp = fopen(tmpfile,"w");
     if (!fp) {

-        redisLog(REDIS_WARNING, "Failed saving the DB: %s", strerror(errno));
+        redisLog(REDIS_WARNING, "Failed opening .rdb for saving: %s",
+            strerror(errno));

         return REDIS_ERR;
     }
         return REDIS_ERR;
     }

-    if (fwrite("REDIS0001",9,1,fp) == 0) goto werr;
+    if (fwrite("REDIS0002",9,1,fp) == 0) goto werr;

     for (j = 0; j < server.dbnum; j++) {
         redisDb *db = server.db+j;
         dict *d = db->dict;
     for (j = 0; j < server.dbnum; j++) {
         redisDb *db = server.db+j;
         dict *d = db->dict;


@@ -389,38 +444,11 @@ int rdbSave(char *filename) {
         while((de = dictNext(di)) != NULL) {
             sds keystr = dictGetEntryKey(de);
             robj key, *o = dictGetEntryVal(de);
         while((de = dictNext(di)) != NULL) {
             sds keystr = dictGetEntryKey(de);
             robj key, *o = dictGetEntryVal(de);

-            time_t expiretime;
+            time_t expire;

             
             initStaticStringObject(key,keystr);
             
             initStaticStringObject(key,keystr);

-            expiretime = getExpire(db,&key);
-
-            /* Save the expire time */
-            if (expiretime != -1) {
-                /* If this key is already expired skip it */
-                if (expiretime < now) continue;
-                if (rdbSaveType(fp,REDIS_EXPIRETIME) == -1) goto werr;
-                if (rdbSaveTime(fp,expiretime) == -1) goto werr;
-            }
-            /* Save the key and associated value. This requires special
-             * handling if the value is swapped out. */
-            if (!server.vm_enabled || o->storage == REDIS_VM_MEMORY ||
-                                      o->storage == REDIS_VM_SWAPPING) {
-                /* Save type, key, value */
-                if (rdbSaveType(fp,o->type) == -1) goto werr;
-                if (rdbSaveStringObject(fp,&key) == -1) goto werr;
-                if (rdbSaveObject(fp,o) == -1) goto werr;
-            } else {
-                /* REDIS_VM_SWAPPED or REDIS_VM_LOADING */
-                robj *po;
-                /* Get a preview of the object in memory */
-                po = vmPreviewObject(o);
-                /* Save type, key, value */
-                if (rdbSaveType(fp,po->type) == -1) goto werr;
-                if (rdbSaveStringObject(fp,&key) == -1) goto werr;
-                if (rdbSaveObject(fp,po) == -1) goto werr;
-                /* Remove the loaded object from memory */
-                decrRefCount(po);
-            }
+            expire = getExpire(db,&key);
+            if (rdbSaveKeyValuePair(fp,&key,o,expire,now) == -1) goto werr;

         }
         dictReleaseIterator(di);
     }
         }
         dictReleaseIterator(di);
     }


@@ -455,18 +483,24 @@ werr:
 int rdbSaveBackground(char *filename) {
     pid_t childpid;
 
 int rdbSaveBackground(char *filename) {
     pid_t childpid;
 

-    if (server.bgsavechildpid != -1) return REDIS_ERR;
-    if (server.vm_enabled) waitEmptyIOJobsQueue();
+    if (server.bgsavechildpid != -1 ||
+        server.bgsavethread != (pthread_t) -1) return REDIS_ERR;
+

     server.dirty_before_bgsave = server.dirty;
     server.dirty_before_bgsave = server.dirty;

+
+    if (server.ds_enabled) {
+        cacheForcePointInTime();
+        return dsRdbSaveBackground(filename);
+    }
+

     if ((childpid = fork()) == 0) {
     if ((childpid = fork()) == 0) {

+        int retval;
+

         /* Child */
         /* Child */

-        if (server.vm_enabled) vmReopenSwapFile();
-        close(server.fd);
-        if (rdbSave(filename) == REDIS_OK) {
-            _exit(0);
-        } else {
-            _exit(1);
-        }
+        if (server.ipfd > 0) close(server.ipfd);
+        if (server.sofd > 0) close(server.sofd);
+        retval = rdbSave(filename);
+        _exit((retval == REDIS_OK) ? 0 : 1);

     } else {
         /* Parent */
         if (childpid == -1) {
     } else {
         /* Parent */
         if (childpid == -1) {


@@ -722,11 +756,13 @@ robj *rdbLoadObject(int type, FILE *fp) {
     } else if (type == REDIS_ZSET) {
         /* Read list/set value */
         size_t zsetlen;
     } else if (type == REDIS_ZSET) {
         /* Read list/set value */
         size_t zsetlen;

+        size_t maxelelen = 0;

         zset *zs;
 
         if ((zsetlen = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL;
         o = createZsetObject();
         zs = o->ptr;
         zset *zs;
 
         if ((zsetlen = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL;
         o = createZsetObject();
         zs = o->ptr;

+

         /* Load every single element of the list/set */
         while(zsetlen--) {
             robj *ele;
         /* Load every single element of the list/set */
         while(zsetlen--) {
             robj *ele;


@@ -736,10 +772,21 @@ robj *rdbLoadObject(int type, FILE *fp) {
             if ((ele = rdbLoadEncodedStringObject(fp)) == NULL) return NULL;
             ele = tryObjectEncoding(ele);
             if (rdbLoadDoubleValue(fp,&score) == -1) return NULL;
             if ((ele = rdbLoadEncodedStringObject(fp)) == NULL) return NULL;
             ele = tryObjectEncoding(ele);
             if (rdbLoadDoubleValue(fp,&score) == -1) return NULL;

+
+            /* Don't care about integer-encoded strings. */
+            if (ele->encoding == REDIS_ENCODING_RAW &&
+                sdslen(ele->ptr) > maxelelen)
+                    maxelelen = sdslen(ele->ptr);
+

             znode = zslInsert(zs->zsl,score,ele);
             dictAdd(zs->dict,ele,&znode->score);
             incrRefCount(ele); /* added to skiplist */
         }
             znode = zslInsert(zs->zsl,score,ele);
             dictAdd(zs->dict,ele,&znode->score);
             incrRefCount(ele); /* added to skiplist */
         }

+
+        /* Convert *after* loading, since sorted sets are not stored ordered. */
+        if (zsetLength(o) <= server.zset_max_ziplist_entries &&
+            maxelelen <= server.zset_max_ziplist_value)
+                zsetConvert(o,REDIS_ENCODING_ZIPLIST);

     } else if (type == REDIS_HASH) {
         size_t hashlen;
 
     } else if (type == REDIS_HASH) {
         size_t hashlen;
 


@@ -786,20 +833,93 @@ robj *rdbLoadObject(int type, FILE *fp) {
                 dictAdd((dict*)o->ptr,key,val);
             }
         }
                 dictAdd((dict*)o->ptr,key,val);
             }
         }

+    } else if (type == REDIS_HASH_ZIPMAP ||
+               type == REDIS_LIST_ZIPLIST ||
+               type == REDIS_SET_INTSET ||
+               type == REDIS_ZSET_ZIPLIST)
+    {
+        robj *aux = rdbLoadStringObject(fp);
+
+        if (aux == NULL) return NULL;
+        o = createObject(REDIS_STRING,NULL); /* string is just placeholder */
+        o->ptr = zmalloc(sdslen(aux->ptr));
+        memcpy(o->ptr,aux->ptr,sdslen(aux->ptr));
+        decrRefCount(aux);
+
+        /* Fix the object encoding, and make sure to convert the encoded
+         * data type into the base type if accordingly to the current
+         * configuration there are too many elements in the encoded data
+         * type. Note that we only check the length and not max element
+         * size as this is an O(N) scan. Eventually everything will get
+         * converted. */
+        switch(type) {
+            case REDIS_HASH_ZIPMAP:
+                o->type = REDIS_HASH;
+                o->encoding = REDIS_ENCODING_ZIPMAP;
+                if (zipmapLen(o->ptr) > server.hash_max_zipmap_entries)
+                    convertToRealHash(o);
+                break;
+            case REDIS_LIST_ZIPLIST:
+                o->type = REDIS_LIST;
+                o->encoding = REDIS_ENCODING_ZIPLIST;
+                if (ziplistLen(o->ptr) > server.list_max_ziplist_entries)
+                    listTypeConvert(o,REDIS_ENCODING_LINKEDLIST);
+                break;
+            case REDIS_SET_INTSET:
+                o->type = REDIS_SET;
+                o->encoding = REDIS_ENCODING_INTSET;
+                if (intsetLen(o->ptr) > server.set_max_intset_entries)
+                    setTypeConvert(o,REDIS_ENCODING_HT);
+                break;
+            case REDIS_ZSET_ZIPLIST:
+                o->type = REDIS_ZSET;
+                o->encoding = REDIS_ENCODING_ZIPLIST;
+                if (zsetLength(o) > server.zset_max_ziplist_entries)
+                    zsetConvert(o,REDIS_ENCODING_SKIPLIST);
+                break;
+            default:
+                redisPanic("Unknown encoding");
+                break;
+        }

     } else {
         redisPanic("Unknown object type");
     }
     return o;
 }
 
     } else {
         redisPanic("Unknown object type");
     }
     return o;
 }
 

+/* Mark that we are loading in the global state and setup the fields
+ * needed to provide loading stats. */
+void startLoading(FILE *fp) {
+    struct stat sb;
+
+    /* Load the DB */
+    server.loading = 1;
+    server.loading_start_time = time(NULL);
+    if (fstat(fileno(fp), &sb) == -1) {
+        server.loading_total_bytes = 1; /* just to avoid division by zero */
+    } else {
+        server.loading_total_bytes = sb.st_size;
+    }
+}
+
+/* Refresh the loading progress info */
+void loadingProgress(off_t pos) {
+    server.loading_loaded_bytes = pos;
+}
+
+/* Loading finished */
+void stopLoading(void) {
+    server.loading = 0;
+}
+

 int rdbLoad(char *filename) {
     FILE *fp;
     uint32_t dbid;
     int type, retval, rdbver;
 int rdbLoad(char *filename) {
     FILE *fp;
     uint32_t dbid;
     int type, retval, rdbver;

-    int swap_all_values = 0;

     redisDb *db = server.db+0;
     char buf[1024];
     time_t expiretime, now = time(NULL);
     redisDb *db = server.db+0;
     char buf[1024];
     time_t expiretime, now = time(NULL);

+    long loops = 0;

 
     fp = fopen(filename,"r");
     if (!fp) return REDIS_ERR;
 
     fp = fopen(filename,"r");
     if (!fp) return REDIS_ERR;


@@ -811,16 +931,23 @@ int rdbLoad(char *filename) {
         return REDIS_ERR;
     }
     rdbver = atoi(buf+5);
         return REDIS_ERR;
     }
     rdbver = atoi(buf+5);

-    if (rdbver != 1) {
+    if (rdbver < 1 || rdbver > 2) {

         fclose(fp);
         redisLog(REDIS_WARNING,"Can't handle RDB format version %d",rdbver);
         return REDIS_ERR;
     }
         fclose(fp);
         redisLog(REDIS_WARNING,"Can't handle RDB format version %d",rdbver);
         return REDIS_ERR;
     }

+
+    startLoading(fp);

     while(1) {
         robj *key, *val;
     while(1) {
         robj *key, *val;

-        int force_swapout;
-

         expiretime = -1;
         expiretime = -1;

+
+        /* Serve the clients from time to time */
+        if (!(loops++ % 1000)) {
+            loadingProgress(ftello(fp));
+            aeProcessEvents(server.el, AE_FILE_EVENTS|AE_DONT_WAIT);
+        }
+

         /* Read type. */
         if ((type = rdbLoadType(fp)) == -1) goto eoferr;
         if (type == REDIS_EXPIRETIME) {
         /* Read type. */
         if ((type = rdbLoadType(fp)) == -1) goto eoferr;
         if (type == REDIS_EXPIRETIME) {


@@ -859,46 +986,10 @@ int rdbLoad(char *filename) {
         /* Set the expire time if needed */
         if (expiretime != -1) setExpire(db,key,expiretime);
 
         /* Set the expire time if needed */
         if (expiretime != -1) setExpire(db,key,expiretime);
 

-        /* Handle swapping while loading big datasets when VM is on */
-
-        /* If we detecter we are hopeless about fitting something in memory
-         * we just swap every new key on disk. Directly...
-         * Note that's important to check for this condition before resorting
-         * to random sampling, otherwise we may try to swap already
-         * swapped keys. */
-        if (swap_all_values) {
-            dictEntry *de = dictFind(db->dict,key->ptr);
-
-            /* de may be NULL since the key already expired */
-            if (de) {
-                vmpointer *vp;
-                val = dictGetEntryVal(de);
-
-                if (val->refcount == 1 &&
-                    (vp = vmSwapObjectBlocking(val)) != NULL)
-                    dictGetEntryVal(de) = vp;
-            }
-            decrRefCount(key);
-            continue;
-        }

         decrRefCount(key);
         decrRefCount(key);

-
-        /* Flush data on disk once 32 MB of additional RAM are used... */
-        force_swapout = 0;
-        if ((zmalloc_used_memory() - server.vm_max_memory) > 1024*1024*32)
-            force_swapout = 1;
-
-        /* If we have still some hope of having some value fitting memory
-         * then we try random sampling. */
-        if (!swap_all_values && server.vm_enabled && force_swapout) {
-            while (zmalloc_used_memory() > server.vm_max_memory) {
-                if (vmSwapOneObjectBlocking() == REDIS_ERR) break;
-            }
-            if (zmalloc_used_memory() > server.vm_max_memory)
-                swap_all_values = 1; /* We are already using too much mem */
-        }

     }
     fclose(fp);
     }
     fclose(fp);

+    stopLoading();

     return REDIS_OK;
 
 eoferr: /* unexpected end of file is handled here with a fatal exit */
     return REDIS_OK;
 
 eoferr: /* unexpected end of file is handled here with a fatal exit */


@@ -908,10 +999,7 @@ eoferr: /* unexpected end of file is handled here with a fatal exit */
 }
 
 /* A background saving child (BGSAVE) terminated its work. Handle this. */
 }
 
 /* A background saving child (BGSAVE) terminated its work. Handle this. */

-void backgroundSaveDoneHandler(int statloc) {
-    int exitcode = WEXITSTATUS(statloc);
-    int bysignal = WIFSIGNALED(statloc);
-
+void backgroundSaveDoneHandler(int exitcode, int bysignal) {

     if (!bysignal && exitcode == 0) {
         redisLog(REDIS_NOTICE,
             "Background saving terminated with success");
     if (!bysignal && exitcode == 0) {
         redisLog(REDIS_NOTICE,
             "Background saving terminated with success");


@@ -921,11 +1009,37 @@ void backgroundSaveDoneHandler(int statloc) {
         redisLog(REDIS_WARNING, "Background saving error");
     } else {
         redisLog(REDIS_WARNING,
         redisLog(REDIS_WARNING, "Background saving error");
     } else {
         redisLog(REDIS_WARNING,

-            "Background saving terminated by signal %d", WTERMSIG(statloc));
+            "Background saving terminated by signal %d", bysignal);

         rdbRemoveTempFile(server.bgsavechildpid);
     }
     server.bgsavechildpid = -1;
         rdbRemoveTempFile(server.bgsavechildpid);
     }
     server.bgsavechildpid = -1;

+    server.bgsavethread = (pthread_t) -1;
+    server.bgsavethread_state = REDIS_BGSAVE_THREAD_UNACTIVE;

     /* Possibly there are slaves waiting for a BGSAVE in order to be served
      * (the first stage of SYNC is a bulk transfer of dump.rdb) */
     updateSlavesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR);
 }
     /* Possibly there are slaves waiting for a BGSAVE in order to be served
      * (the first stage of SYNC is a bulk transfer of dump.rdb) */
     updateSlavesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR);
 }

+
+void saveCommand(redisClient *c) {
+    if (server.bgsavechildpid != -1 || server.bgsavethread != (pthread_t)-1) {
+        addReplyError(c,"Background save already in progress");
+        return;
+    }
+    if (rdbSave(server.dbfilename) == REDIS_OK) {
+        addReply(c,shared.ok);
+    } else {
+        addReply(c,shared.err);
+    }
+}
+
+void bgsaveCommand(redisClient *c) {
+    if (server.bgsavechildpid != -1 || server.bgsavethread != (pthread_t)-1) {
+        addReplyError(c,"Background save already in progress");
+        return;
+    }
+    if (rdbSaveBackground(server.dbfilename) == REDIS_OK) {
+        addReplyStatus(c,"Background saving started");
+    } else {
+        addReply(c,shared.err);
+    }
+}