#include <math.h>
/* Protoypes (static) */
-static memcached_return server_add(memcached_st *ptr, char *hostname,
- unsigned int port,
- memcached_connection type);
-memcached_return update_continuum(memcached_st *ptr);
+static memcached_return_t server_add(memcached_st *ptr, const char *hostname,
+ in_port_t port,
+ uint32_t weight,
+ memcached_connection_t type);
+memcached_return_t update_continuum(memcached_st *ptr);
static int compare_servers(const void *p1, const void *p2)
{
return return_value;
}
-void sort_hosts(memcached_st *ptr)
+static void sort_hosts(memcached_st *ptr)
{
if (ptr->number_of_hosts)
{
qsort(ptr->hosts, ptr->number_of_hosts, sizeof(memcached_server_st), compare_servers);
- ptr->hosts[0].count= ptr->number_of_hosts;
+ ptr->hosts[0].count= (uint16_t) ptr->number_of_hosts;
}
}
-memcached_return run_distribution(memcached_st *ptr)
+memcached_return_t run_distribution(memcached_st *ptr)
{
- switch (ptr->distribution)
+ switch (ptr->distribution)
{
case MEMCACHED_DISTRIBUTION_CONSISTENT:
case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA:
+ case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY:
return update_continuum(ptr);
case MEMCACHED_DISTRIBUTION_MODULA:
- if (ptr->flags & MEM_USE_SORT_HOSTS)
+ if (ptr->flags.use_sort_hosts)
sort_hosts(ptr);
break;
+ case MEMCACHED_DISTRIBUTION_RANDOM:
+ break;
default:
WATCHPOINT_ASSERT(0); /* We have added a distribution without extending the logic */
}
- return MEMCACHED_SUCCESS;
-}
+ ptr->last_disconnected_server = NULL;
-static void host_reset(memcached_st *ptr, memcached_server_st *host,
- char *hostname, unsigned int port,
- memcached_connection type)
-{
- memset(host, 0, sizeof(memcached_server_st));
- strncpy(host->hostname, hostname, MEMCACHED_MAX_HOST_LENGTH - 1);
- host->root= ptr ? ptr : NULL;
- host->port= port;
- host->fd= -1;
- host->type= type;
- host->read_ptr= host->read_buffer;
- if (ptr)
- host->next_retry= ptr->retry_timeout;
- host->sockaddr_inited= MEMCACHED_NOT_ALLOCATED;
+ return MEMCACHED_SUCCESS;
}
void server_list_free(memcached_st *ptr, memcached_server_st *servers)
servers[x].address_info= NULL;
}
- if (ptr && ptr->call_free)
+ if (ptr)
ptr->call_free(ptr, servers);
else
free(servers);
}
+static uint32_t ketama_server_hash(const char *key, unsigned int key_length, int alignment)
+{
+ unsigned char results[16];
+
+ md5_signature((unsigned char*)key, key_length, results);
+ return ((uint32_t) (results[3 + alignment * 4] & 0xFF) << 24)
+ | ((uint32_t) (results[2 + alignment * 4] & 0xFF) << 16)
+ | ((uint32_t) (results[1 + alignment * 4] & 0xFF) << 8)
+ | (results[0 + alignment * 4] & 0xFF);
+}
+
static int continuum_item_cmp(const void *t1, const void *t2)
{
- memcached_continuum_item_st *ct1 = (memcached_continuum_item_st *)t1;
- memcached_continuum_item_st *ct2 = (memcached_continuum_item_st *)t2;
+ memcached_continuum_item_st *ct1= (memcached_continuum_item_st *)t1;
+ memcached_continuum_item_st *ct2= (memcached_continuum_item_st *)t2;
+ /* Why 153? Hmmm... */
WATCHPOINT_ASSERT(ct1->value != 153);
if (ct1->value == ct2->value)
return 0;
return -1;
}
-memcached_return update_continuum(memcached_st *ptr)
+memcached_return_t update_continuum(memcached_st *ptr)
{
- uint32_t index;
uint32_t host_index;
uint32_t continuum_index= 0;
uint32_t value;
memcached_server_st *list;
+ uint32_t pointer_index;
uint32_t pointer_counter= 0;
uint32_t pointer_per_server= MEMCACHED_POINTS_PER_SERVER;
- memcached_return rc;
- uint64_t total_mem_bytes= 0;
- memcached_stat_st *stat_p= NULL;
- uint32_t is_ketama_weighted= 0;
+ uint32_t pointer_per_hash= 1;
+ uint64_t total_weight= 0;
+ uint64_t is_ketama_weighted= 0;
+ uint64_t is_auto_ejecting= 0;
+ uint32_t points_per_server= 0;
+ uint32_t live_servers= 0;
+ struct timeval now;
+
+ if (gettimeofday(&now, NULL) != 0)
+ {
+ ptr->cached_errno = errno;
+ return MEMCACHED_ERRNO;
+ }
+
+ list = ptr->hosts;
+
+ /* count live servers (those without a retry delay set) */
+ is_auto_ejecting= memcached_behavior_get(ptr, MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS);
+ if (is_auto_ejecting)
+ {
+ live_servers= 0;
+ ptr->next_distribution_rebuild= 0;
+ for (host_index= 0; host_index < ptr->number_of_hosts; ++host_index)
+ {
+ if (list[host_index].next_retry <= now.tv_sec)
+ live_servers++;
+ else
+ {
+ if (ptr->next_distribution_rebuild == 0 || list[host_index].next_retry < ptr->next_distribution_rebuild)
+ ptr->next_distribution_rebuild= list[host_index].next_retry;
+ }
+ }
+ }
+ else
+ live_servers= ptr->number_of_hosts;
+
+ is_ketama_weighted= memcached_behavior_get(ptr, MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED);
+ points_per_server= (uint32_t) (is_ketama_weighted ? MEMCACHED_POINTS_PER_SERVER_KETAMA : MEMCACHED_POINTS_PER_SERVER);
+
+ if (live_servers == 0)
+ return MEMCACHED_SUCCESS;
- if (ptr->number_of_hosts > ptr->continuum_count)
+ if (live_servers > ptr->continuum_count)
{
memcached_continuum_item_st *new_ptr;
- if (ptr->call_realloc)
- new_ptr= (memcached_continuum_item_st *)ptr->call_realloc(ptr, ptr->continuum, sizeof(memcached_continuum_item_st) * (ptr->number_of_hosts + MEMCACHED_CONTINUUM_ADDITION) * MEMCACHED_POINTS_PER_SERVER);
- else
- new_ptr= (memcached_continuum_item_st *)realloc(ptr->continuum, sizeof(memcached_continuum_item_st) * (ptr->number_of_hosts + MEMCACHED_CONTINUUM_ADDITION) * MEMCACHED_POINTS_PER_SERVER);
+ new_ptr= ptr->call_realloc(ptr, ptr->continuum,
+ sizeof(memcached_continuum_item_st) * (live_servers + MEMCACHED_CONTINUUM_ADDITION) * points_per_server);
if (new_ptr == 0)
return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
ptr->continuum= new_ptr;
- ptr->continuum_count= ptr->number_of_hosts + MEMCACHED_CONTINUUM_ADDITION;
+ ptr->continuum_count= live_servers + MEMCACHED_CONTINUUM_ADDITION;
}
- list = ptr->hosts;
-
- is_ketama_weighted= memcached_behavior_get(ptr, MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED);
- if(is_ketama_weighted)
+ if (is_ketama_weighted)
{
- stat_p = memcached_stat(ptr, NULL, &rc);
- for (host_index = 0; host_index < ptr->number_of_hosts; ++host_index)
+ for (host_index = 0; host_index < ptr->number_of_hosts; ++host_index)
{
- list[host_index].limit_maxbytes= (stat_p + host_index)->limit_maxbytes;
- total_mem_bytes += (stat_p + host_index)->limit_maxbytes;
+ if (list[host_index].weight == 0)
+ {
+ list[host_index].weight = 1;
+ }
+ if (!is_auto_ejecting || list[host_index].next_retry <= now.tv_sec)
+ total_weight += list[host_index].weight;
}
}
- for (host_index = 0; host_index < ptr->number_of_hosts; ++host_index)
+ for (host_index = 0; host_index < ptr->number_of_hosts; ++host_index)
{
- if(is_ketama_weighted)
+ if (is_auto_ejecting && list[host_index].next_retry > now.tv_sec)
+ continue;
+
+ if (is_ketama_weighted)
{
- float pct = (float)list[host_index].limit_maxbytes/ (float)total_mem_bytes;
- pointer_per_server= floorf( pct * MEMCACHED_POINTS_PER_SERVER * (float)(ptr->number_of_hosts));
-#ifdef HAVE_DEBUG
- printf("ketama_weighted:%s|%d|%llu|%u\n", list[host_index].hostname, list[host_index].port, list[host_index].limit_maxbytes, pointer_per_server);
+ float pct = (float)list[host_index].weight / (float)total_weight;
+ pointer_per_server= (uint32_t) ((floorf((float) (pct * MEMCACHED_POINTS_PER_SERVER_KETAMA / 4 * (float)live_servers + 0.0000000001))) * 4);
+ pointer_per_hash= 4;
+#ifdef DEBUG
+ printf("ketama_weighted:%s|%d|%llu|%u\n",
+ list[host_index].hostname,
+ list[host_index].port,
+ (unsigned long long)list[host_index].weight,
+ pointer_per_server);
#endif
}
- for(index= 1; index <= pointer_per_server; ++index)
+
+
+ if (ptr->distribution == MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY)
{
- char sort_host[MEMCACHED_MAX_HOST_SORT_LENGTH]= "";
- size_t sort_host_length;
-
- sort_host_length= snprintf(sort_host, MEMCACHED_MAX_HOST_SORT_LENGTH, "%s:%d-%d",
- list[host_index].hostname, list[host_index].port, index);
- WATCHPOINT_ASSERT(sort_host_length);
- value= generate_hash_value(sort_host, sort_host_length, ptr->hash_continuum);
- ptr->continuum[continuum_index].index= host_index;
- ptr->continuum[continuum_index++].value= value;
+ for (pointer_index= 0;
+ pointer_index < pointer_per_server / pointer_per_hash;
+ pointer_index++)
+ {
+ char sort_host[MEMCACHED_MAX_HOST_SORT_LENGTH]= "";
+ size_t sort_host_length;
+
+ // Spymemcached ketema key format is: hostname/ip:port-index
+ // If hostname is not available then: /ip:port-index
+ sort_host_length= (size_t) snprintf(sort_host, MEMCACHED_MAX_HOST_SORT_LENGTH,
+ "/%s:%d-%d",
+ list[host_index].hostname,
+ list[host_index].port,
+ pointer_index);
+#ifdef DEBUG
+ printf("update_continuum: key is %s\n", sort_host);
+#endif
+
+ WATCHPOINT_ASSERT(sort_host_length);
+
+ if (is_ketama_weighted)
+ {
+ unsigned int i;
+ for (i = 0; i < pointer_per_hash; i++)
+ {
+ value= ketama_server_hash(sort_host, (uint32_t) sort_host_length, (int) i);
+ ptr->continuum[continuum_index].index= host_index;
+ ptr->continuum[continuum_index++].value= value;
+ }
+ }
+ else
+ {
+ value= memcached_generate_hash_value(sort_host, sort_host_length, ptr->hash_continuum);
+ ptr->continuum[continuum_index].index= host_index;
+ ptr->continuum[continuum_index++].value= value;
+ }
+ }
+ }
+ else
+ {
+ for (pointer_index= 1;
+ pointer_index <= pointer_per_server / pointer_per_hash;
+ pointer_index++)
+ {
+ char sort_host[MEMCACHED_MAX_HOST_SORT_LENGTH]= "";
+ size_t sort_host_length;
+
+ if (list[host_index].port == MEMCACHED_DEFAULT_PORT)
+ {
+ sort_host_length= (size_t) snprintf(sort_host, MEMCACHED_MAX_HOST_SORT_LENGTH,
+ "%s-%d",
+ list[host_index].hostname,
+ pointer_index - 1);
+ }
+ else
+ {
+ sort_host_length= (size_t) snprintf(sort_host, MEMCACHED_MAX_HOST_SORT_LENGTH,
+ "%s:%d-%d",
+ list[host_index].hostname,
+ list[host_index].port, pointer_index - 1);
+ }
+
+ WATCHPOINT_ASSERT(sort_host_length);
+
+ if (is_ketama_weighted)
+ {
+ unsigned int i;
+ for (i = 0; i < pointer_per_hash; i++)
+ {
+ value= ketama_server_hash(sort_host, (uint32_t) sort_host_length, (int) i);
+ ptr->continuum[continuum_index].index= host_index;
+ ptr->continuum[continuum_index++].value= value;
+ }
+ }
+ else
+ {
+ value= memcached_generate_hash_value(sort_host, sort_host_length, ptr->hash_continuum);
+ ptr->continuum[continuum_index].index= host_index;
+ ptr->continuum[continuum_index++].value= value;
+ }
+ }
}
+
pointer_counter+= pointer_per_server;
}
+ WATCHPOINT_ASSERT(ptr);
+ WATCHPOINT_ASSERT(ptr->continuum);
WATCHPOINT_ASSERT(ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER <= MEMCACHED_CONTINUUM_SIZE);
- qsort(ptr->continuum, ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER, sizeof(memcached_continuum_item_st), continuum_item_cmp);
-
ptr->continuum_points_counter= pointer_counter;
- if (stat_p)
- memcached_stat_free(NULL, stat_p);
+ qsort(ptr->continuum, ptr->continuum_points_counter, sizeof(memcached_continuum_item_st), continuum_item_cmp);
-#ifdef HAVE_DEBUG
- for (index= 0; index < ((ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER) - 1); index++)
+#ifdef DEBUG
+ for (pointer_index= 0; ptr->number_of_hosts && pointer_index < ((live_servers * MEMCACHED_POINTS_PER_SERVER) - 1); pointer_index++)
{
- WATCHPOINT_ASSERT(ptr->continuum[index].value <= ptr->continuum[index + 1].value);
+ WATCHPOINT_ASSERT(ptr->continuum[pointer_index].value <= ptr->continuum[pointer_index + 1].value);
}
#endif
}
-memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list)
+memcached_return_t memcached_server_push(memcached_st *ptr, memcached_server_st *list)
{
unsigned int x;
uint16_t count;
return MEMCACHED_SUCCESS;
count= list[0].count;
-
- if (ptr->call_realloc)
- new_host_list=
- (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
- sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
- else
- new_host_list=
- (memcached_server_st *)realloc(ptr->hosts,
- sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
+ new_host_list= ptr->call_realloc(ptr, ptr->hosts,
+ sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
if (!new_host_list)
return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
ptr->hosts= new_host_list;
-
+
for (x= 0; x < count; x++)
{
+ if ((ptr->flags.use_udp && list[x].type != MEMCACHED_CONNECTION_UDP)
+ || ((list[x].type == MEMCACHED_CONNECTION_UDP)
+ && ! (ptr->flags.use_udp)) )
+ return MEMCACHED_INVALID_HOST_PROTOCOL;
+
WATCHPOINT_ASSERT(list[x].hostname[0] != 0);
- host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], list[x].hostname,
- list[x].port, list[x].type);
+ memcached_server_create(ptr, &ptr->hosts[ptr->number_of_hosts]);
+ /* TODO check return type */
+ (void)memcached_server_create_with(ptr, &ptr->hosts[ptr->number_of_hosts], list[x].hostname,
+ list[x].port, list[x].weight, list[x].type);
ptr->number_of_hosts++;
}
- ptr->hosts[0].count= ptr->number_of_hosts;
+ ptr->hosts[0].count= (uint16_t) ptr->number_of_hosts;
return run_distribution(ptr);
}
-memcached_return memcached_server_add_unix_socket(memcached_st *ptr, char *filename)
+memcached_return_t memcached_server_add_unix_socket(memcached_st *ptr,
+ const char *filename)
+{
+ return memcached_server_add_unix_socket_with_weight(ptr, filename, 0);
+}
+
+memcached_return_t memcached_server_add_unix_socket_with_weight(memcached_st *ptr,
+ const char *filename,
+ uint32_t weight)
{
if (!filename)
return MEMCACHED_FAILURE;
- return server_add(ptr, filename, 0, MEMCACHED_CONNECTION_UNIX_SOCKET);
+ return server_add(ptr, filename, 0, weight, MEMCACHED_CONNECTION_UNIX_SOCKET);
}
-memcached_return memcached_server_add_udp(memcached_st *ptr,
- char *hostname,
- unsigned int port)
+memcached_return_t memcached_server_add_udp(memcached_st *ptr,
+ const char *hostname,
+ in_port_t port)
+{
+ return memcached_server_add_udp_with_weight(ptr, hostname, port, 0);
+}
+
+memcached_return_t memcached_server_add_udp_with_weight(memcached_st *ptr,
+ const char *hostname,
+ in_port_t port,
+ uint32_t weight)
{
if (!port)
- port= MEMCACHED_DEFAULT_PORT;
+ port= MEMCACHED_DEFAULT_PORT;
if (!hostname)
- hostname= "localhost";
+ hostname= "localhost";
+
+ return server_add(ptr, hostname, port, weight, MEMCACHED_CONNECTION_UDP);
+}
- return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_UDP);
+memcached_return_t memcached_server_add(memcached_st *ptr,
+ const char *hostname,
+ in_port_t port)
+{
+ return memcached_server_add_with_weight(ptr, hostname, port, 0);
}
-memcached_return memcached_server_add(memcached_st *ptr,
- char *hostname,
- unsigned int port)
+memcached_return_t memcached_server_add_with_weight(memcached_st *ptr,
+ const char *hostname,
+ in_port_t port,
+ uint32_t weight)
{
if (!port)
- port= MEMCACHED_DEFAULT_PORT;
+ port= MEMCACHED_DEFAULT_PORT;
if (!hostname)
- hostname= "localhost";
+ hostname= "localhost";
- return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_TCP);
+ return server_add(ptr, hostname, port, weight, MEMCACHED_CONNECTION_TCP);
}
-static memcached_return server_add(memcached_st *ptr, char *hostname,
- unsigned int port,
- memcached_connection type)
+static memcached_return_t server_add(memcached_st *ptr, const char *hostname,
+ in_port_t port,
+ uint32_t weight,
+ memcached_connection_t type)
{
memcached_server_st *new_host_list;
- if (ptr->call_realloc)
- new_host_list= (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
- sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
- else
- new_host_list= (memcached_server_st *)realloc(ptr->hosts,
- sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
+ if ( (ptr->flags.use_udp && type != MEMCACHED_CONNECTION_UDP)
+ || ( (type == MEMCACHED_CONNECTION_UDP) && (! ptr->flags.use_udp) ) )
+ return MEMCACHED_INVALID_HOST_PROTOCOL;
+
+ new_host_list= ptr->call_realloc(ptr, ptr->hosts,
+ sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
+
if (new_host_list == NULL)
return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
ptr->hosts= new_host_list;
- host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], hostname, port, type);
+ /* TODO: Check return type */
+ (void)memcached_server_create_with(ptr, &ptr->hosts[ptr->number_of_hosts], hostname, port, weight, type);
ptr->number_of_hosts++;
- ptr->hosts[0].count= ptr->number_of_hosts;
+ ptr->hosts[0].count= (uint16_t) ptr->number_of_hosts;
return run_distribution(ptr);
}
-memcached_return memcached_server_remove(memcached_server_st *st_ptr)
+memcached_return_t memcached_server_remove(memcached_server_st *st_ptr)
{
- uint32_t x, index;
+ uint32_t x, host_index;
memcached_st *ptr= st_ptr->root;
memcached_server_st *list= ptr->hosts;
- for (x= 0, index= 0; x < ptr->number_of_hosts; x++)
+ for (x= 0, host_index= 0; x < ptr->number_of_hosts; x++)
{
- if (strncmp(list[x].hostname, st_ptr->hostname, MEMCACHED_MAX_HOST_LENGTH)!=0 || list[x].port != st_ptr->port)
- {
- memcpy(list+index, list+x, sizeof(memcached_server_st));
- index++;
- }
- else
+ if (strncmp(list[x].hostname, st_ptr->hostname, MEMCACHED_MAX_HOST_LENGTH) != 0 || list[x].port != st_ptr->port)
{
- ptr->number_of_hosts--;
+ if (host_index != x)
+ memcpy(list+host_index, list+x, sizeof(memcached_server_st));
+ host_index++;
}
}
+ ptr->number_of_hosts= host_index;
-
- if (st_ptr->address_info)
+ if (st_ptr->address_info)
+ {
freeaddrinfo(st_ptr->address_info);
+ st_ptr->address_info= NULL;
+ }
run_distribution(ptr);
return MEMCACHED_SUCCESS;
}
-memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
- char *hostname, unsigned int port,
- memcached_return *error)
+memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
+ const char *hostname, in_port_t port,
+ memcached_return_t *error)
+{
+ return memcached_server_list_append_with_weight(ptr, hostname, port, 0, error);
+}
+
+memcached_server_st *memcached_server_list_append_with_weight(memcached_server_st *ptr,
+ const char *hostname, in_port_t port,
+ uint32_t weight,
+ memcached_return_t *error)
{
unsigned int count;
memcached_server_st *new_host_list;
return NULL;
if (!port)
- port= MEMCACHED_DEFAULT_PORT;
+ port= MEMCACHED_DEFAULT_PORT;
/* Increment count for hosts */
count= 1;
if (ptr != NULL)
{
count+= ptr[0].count;
- }
+ }
new_host_list= (memcached_server_st *)realloc(ptr, sizeof(memcached_server_st) * count);
if (!new_host_list)
return NULL;
}
- host_reset(NULL, &new_host_list[count-1], hostname, port, MEMCACHED_CONNECTION_TCP);
+ /* TODO: Check return type */
+ memcached_server_create_with(NULL, &new_host_list[count-1], hostname, port, weight, MEMCACHED_CONNECTION_TCP);
/* Backwards compatibility hack */
- new_host_list[0].count= count;
+ new_host_list[0].count= (uint16_t) count;
*error= MEMCACHED_SUCCESS;
return new_host_list;
projects / m6w6 / libmemcached / blobdiff