2 * Copyright (C) 2006-2009 Brian Aker
5 * Use and distribution licensed under the BSD license. See
6 * the COPYING file in the parent directory for full text.
8 * Summary: Change the behavior of the memcached connection.
12 #include <libmemcached/common.h>
13 #include <libmemcached/virtual_bucket.h>
16 #include <sys/types.h>
18 static bool set_flag(uint64_t data
)
21 return data
? true : false;
25 This function is used to modify the behavior of running client.
27 We quit all connections so we can reset the sockets.
30 memcached_return_t
memcached_behavior_set(memcached_st
*ptr
,
31 const memcached_behavior_t flag
,
36 case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS
:
37 ptr
->number_of_replicas
= (uint32_t)data
;
39 case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK
:
40 ptr
->io_msg_watermark
= (uint32_t) data
;
42 case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK
:
43 ptr
->io_bytes_watermark
= (uint32_t)data
;
45 case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH
:
46 ptr
->io_key_prefetch
= (uint32_t)data
;
48 case MEMCACHED_BEHAVIOR_SND_TIMEOUT
:
49 ptr
->snd_timeout
= (int32_t)data
;
51 case MEMCACHED_BEHAVIOR_RCV_TIMEOUT
:
52 ptr
->rcv_timeout
= (int32_t)data
;
54 case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT
:
55 ptr
->server_failure_limit
= (uint32_t)data
;
57 case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL
:
58 memcached_quit(ptr
); // We need t shutdown all of the connections to make sure we do the correct protocol
61 ptr
->flags
.verify_key
= false;
63 ptr
->flags
.binary_protocol
= set_flag(data
);
65 case MEMCACHED_BEHAVIOR_SUPPORT_CAS
:
66 ptr
->flags
.support_cas
= set_flag(data
);
68 case MEMCACHED_BEHAVIOR_NO_BLOCK
:
69 ptr
->flags
.no_block
= set_flag(data
);
72 case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS
:
73 ptr
->flags
.buffer_requests
= set_flag(data
);
76 case MEMCACHED_BEHAVIOR_USE_UDP
:
77 if (memcached_server_count(ptr
))
79 return MEMCACHED_FAILURE
;
81 ptr
->flags
.use_udp
= set_flag(data
);
84 ptr
->flags
.no_reply
= set_flag(data
);
87 case MEMCACHED_BEHAVIOR_TCP_NODELAY
:
88 ptr
->flags
.tcp_nodelay
= set_flag(data
);
91 case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE
:
92 ptr
->flags
.tcp_keepalive
= set_flag(data
);
95 case MEMCACHED_BEHAVIOR_DISTRIBUTION
:
96 return memcached_behavior_set_distribution(ptr
, (memcached_server_distribution_t
)data
);
97 case MEMCACHED_BEHAVIOR_KETAMA
:
100 return memcached_behavior_set_distribution(ptr
, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA
);
102 return memcached_behavior_set_distribution(ptr
, MEMCACHED_DISTRIBUTION_MODULA
);
104 case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED
:
106 (void)memcached_behavior_set_key_hash(ptr
, MEMCACHED_HASH_MD5
);
107 (void)memcached_behavior_set_distribution_hash(ptr
, MEMCACHED_HASH_MD5
);
108 ptr
->ketama
.weighted
= set_flag(data
);
110 @note We try to keep the same distribution going. This should be deprecated and rewritten.
112 return memcached_behavior_set_distribution(ptr
, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA
);
114 case MEMCACHED_BEHAVIOR_HASH
:
115 return memcached_behavior_set_key_hash(ptr
, (memcached_hash_t
)(data
));
116 case MEMCACHED_BEHAVIOR_KETAMA_HASH
:
117 return memcached_behavior_set_distribution_hash(ptr
, (memcached_hash_t
)(data
));
118 case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS
:
119 ptr
->flags
.use_cache_lookups
= set_flag(data
);
122 case MEMCACHED_BEHAVIOR_VERIFY_KEY
:
123 if (ptr
->flags
.binary_protocol
)
124 return memcached_set_error_string(ptr
, MEMCACHED_FAILURE
,
125 memcached_string_with_size("MEMCACHED_BEHAVIOR_VERIFY_KEY if the binary protocol has been enabled."));
126 ptr
->flags
.verify_key
= set_flag(data
);
128 case MEMCACHED_BEHAVIOR_SORT_HOSTS
:
130 ptr
->flags
.use_sort_hosts
= set_flag(data
);
131 run_distribution(ptr
);
135 case MEMCACHED_BEHAVIOR_POLL_TIMEOUT
:
136 ptr
->poll_timeout
= (int32_t)data
;
138 case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT
:
139 ptr
->connect_timeout
= (int32_t)data
;
141 case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT
:
142 ptr
->retry_timeout
= (int32_t)data
;
144 case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE
:
145 ptr
->send_size
= (int32_t)data
;
148 case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE
:
149 ptr
->recv_size
= (int32_t)data
;
152 case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE
:
153 ptr
->tcp_keepidle
= (uint32_t)data
;
156 case MEMCACHED_BEHAVIOR_USER_DATA
:
157 return memcached_set_error_string(ptr
, MEMCACHED_FAILURE
,
158 memcached_string_with_size("MEMCACHED_BEHAVIOR_USER_DATA deprecated."));
159 case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY
:
160 ptr
->flags
.hash_with_prefix_key
= set_flag(data
);
162 case MEMCACHED_BEHAVIOR_NOREPLY
:
163 ptr
->flags
.no_reply
= set_flag(data
);
165 case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS
:
166 ptr
->flags
.auto_eject_hosts
= set_flag(data
);
168 case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ
:
169 srandom((uint32_t) time(NULL
));
170 ptr
->flags
.randomize_replica_read
= set_flag(data
);
172 case MEMCACHED_BEHAVIOR_CORK
:
177 return memcached_set_error_string(ptr
, MEMCACHED_NOT_SUPPORTED
,
178 memcached_string_with_size("MEMCACHED_BEHAVIOR_CORK is not supported on this platform."));
182 case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE
:
183 return memcached_set_error_string(ptr
, MEMCACHED_INVALID_ARGUMENTS
,
184 memcached_string_with_size("MEMCACHED_BEHAVIOR_LOAD_FROM_FILE can not be set with memcached_behavior_set()"));
185 case MEMCACHED_BEHAVIOR_MAX
:
187 /* Shouldn't get here */
188 WATCHPOINT_ASSERT(0);
189 return memcached_set_error_string(ptr
, MEMCACHED_INVALID_ARGUMENTS
,
190 memcached_string_with_size("Invalid behavior passed to memcached_behavior_set()"));
193 return MEMCACHED_SUCCESS
;
196 bool _is_auto_eject_host(const memcached_st
*ptr
)
198 return ptr
->flags
.auto_eject_hosts
;
201 uint64_t memcached_behavior_get(memcached_st
*ptr
,
202 const memcached_behavior_t flag
)
206 case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS
:
207 return ptr
->number_of_replicas
;
208 case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK
:
209 return ptr
->io_msg_watermark
;
210 case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK
:
211 return ptr
->io_bytes_watermark
;
212 case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH
:
213 return ptr
->io_key_prefetch
;
214 case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL
:
215 return ptr
->flags
.binary_protocol
;
216 case MEMCACHED_BEHAVIOR_SUPPORT_CAS
:
217 return ptr
->flags
.support_cas
;
218 case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS
:
219 return ptr
->flags
.use_cache_lookups
;
220 case MEMCACHED_BEHAVIOR_NO_BLOCK
:
221 return ptr
->flags
.no_block
;
222 case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS
:
223 return ptr
->flags
.buffer_requests
;
224 case MEMCACHED_BEHAVIOR_USE_UDP
:
225 return ptr
->flags
.use_udp
;
226 case MEMCACHED_BEHAVIOR_TCP_NODELAY
:
227 return ptr
->flags
.tcp_nodelay
;
228 case MEMCACHED_BEHAVIOR_VERIFY_KEY
:
229 return ptr
->flags
.verify_key
;
230 case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED
:
231 return ptr
->ketama
.weighted
;
232 case MEMCACHED_BEHAVIOR_DISTRIBUTION
:
233 return ptr
->distribution
;
234 case MEMCACHED_BEHAVIOR_KETAMA
:
235 return (ptr
->distribution
== MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA
) ? (uint64_t) 1 : 0;
236 case MEMCACHED_BEHAVIOR_HASH
:
237 return hashkit_get_function(&ptr
->hashkit
);
238 case MEMCACHED_BEHAVIOR_KETAMA_HASH
:
239 return hashkit_get_function(&ptr
->distribution_hashkit
);
240 case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT
:
241 return ptr
->server_failure_limit
;
242 case MEMCACHED_BEHAVIOR_SORT_HOSTS
:
243 return ptr
->flags
.use_sort_hosts
;
244 case MEMCACHED_BEHAVIOR_POLL_TIMEOUT
:
245 return (uint64_t)ptr
->poll_timeout
;
246 case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT
:
247 return (uint64_t)ptr
->connect_timeout
;
248 case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT
:
249 return (uint64_t)ptr
->retry_timeout
;
250 case MEMCACHED_BEHAVIOR_SND_TIMEOUT
:
251 return (uint64_t)ptr
->snd_timeout
;
252 case MEMCACHED_BEHAVIOR_RCV_TIMEOUT
:
253 return (uint64_t)ptr
->rcv_timeout
;
254 case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE
:
255 return (uint64_t)ptr
->tcp_keepidle
;
256 case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE
:
259 socklen_t sock_length
= sizeof(int);
260 memcached_server_write_instance_st instance
;
262 if (ptr
->send_size
!= -1) // If value is -1 then we are using the default
263 return (uint64_t) ptr
->send_size
;
265 instance
= memcached_server_instance_fetch(ptr
, 0);
267 if (instance
) // If we have an instance we test, otherwise we just set and pray
270 /* We just try the first host, and if it is down we return zero */
271 if ((memcached_connect(instance
)) != MEMCACHED_SUCCESS
)
276 if (memcached_io_wait_for_write(instance
) != MEMCACHED_SUCCESS
)
281 if (getsockopt(instance
->fd
, SOL_SOCKET
, SO_SNDBUF
, &sock_size
, &sock_length
) < 0)
283 memcached_set_errno(ptr
, errno
, NULL
);
284 return 0; /* Zero means error */
288 return (uint64_t) sock_size
;
290 case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE
:
293 socklen_t sock_length
= sizeof(int);
294 memcached_server_write_instance_st instance
;
296 if (ptr
->recv_size
!= -1) // If value is -1 then we are using the default
297 return (uint64_t) ptr
->recv_size
;
299 instance
= memcached_server_instance_fetch(ptr
, 0);
306 /* We just try the first host, and if it is down we return zero */
307 if ((memcached_connect(instance
)) != MEMCACHED_SUCCESS
)
312 if (memcached_io_wait_for_write(instance
) != MEMCACHED_SUCCESS
)
317 if (getsockopt(instance
->fd
, SOL_SOCKET
, SO_RCVBUF
, &sock_size
, &sock_length
) < 0)
319 memcached_set_errno(ptr
, errno
, NULL
);
320 return 0; /* Zero means error */
325 return (uint64_t) sock_size
;
327 case MEMCACHED_BEHAVIOR_USER_DATA
:
328 return memcached_set_error_string(ptr
, MEMCACHED_FAILURE
,
329 memcached_string_with_size("MEMCACHED_BEHAVIOR_USER_DATA deprecated."));
330 case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY
:
331 return ptr
->flags
.hash_with_prefix_key
;
332 case MEMCACHED_BEHAVIOR_NOREPLY
:
333 return ptr
->flags
.no_reply
;
334 case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS
:
335 return ptr
->flags
.auto_eject_hosts
;
336 case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ
:
337 return ptr
->flags
.randomize_replica_read
;
338 case MEMCACHED_BEHAVIOR_CORK
:
344 case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE
:
345 return ptr
->flags
.tcp_keepalive
;
346 case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE
:
347 return ptr
->configure
.filename
? true : false;
348 case MEMCACHED_BEHAVIOR_MAX
:
350 WATCHPOINT_ASSERT(0); /* Programming mistake if it gets this far */
358 memcached_return_t
memcached_behavior_set_distribution(memcached_st
*ptr
, memcached_server_distribution_t type
)
360 if (type
< MEMCACHED_DISTRIBUTION_CONSISTENT_MAX
)
362 if (MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED
)
364 ptr
->ketama
.weighted
= true;
368 ptr
->ketama
.weighted
= false;
370 ptr
->distribution
= type
;
371 run_distribution(ptr
);
372 return MEMCACHED_SUCCESS
;
375 return memcached_set_error_string(ptr
, MEMCACHED_INVALID_ARGUMENTS
,
376 memcached_string_with_size("Invalid memcached_server_distribution_t"));
380 memcached_server_distribution_t
memcached_behavior_get_distribution(memcached_st
*ptr
)
382 return ptr
->distribution
;
385 memcached_return_t
memcached_behavior_set_key_hash(memcached_st
*ptr
, memcached_hash_t type
)
387 if (hashkit_set_function(&ptr
->hashkit
, (hashkit_hash_algorithm_t
)type
) == HASHKIT_SUCCESS
)
388 return MEMCACHED_SUCCESS
;
390 return memcached_set_error_string(ptr
, MEMCACHED_INVALID_ARGUMENTS
,
391 memcached_string_with_size("Invalid memcached_hash_t()"));
394 memcached_hash_t
memcached_behavior_get_key_hash(memcached_st
*ptr
)
396 return (memcached_hash_t
)hashkit_get_function(&ptr
->hashkit
);
399 memcached_return_t
memcached_behavior_set_distribution_hash(memcached_st
*ptr
, memcached_hash_t type
)
401 if (hashkit_set_function(&ptr
->distribution_hashkit
, (hashkit_hash_algorithm_t
)type
) == HASHKIT_SUCCESS
)
402 return MEMCACHED_SUCCESS
;
404 return memcached_set_error_string(ptr
, MEMCACHED_INVALID_ARGUMENTS
,
405 memcached_string_with_size("Invalid memcached_hash_t()"));
408 memcached_hash_t
memcached_behavior_get_distribution_hash(memcached_st
*ptr
)
410 return (memcached_hash_t
)hashkit_get_function(&ptr
->distribution_hashkit
);
413 const char *libmemcached_string_behavior(const memcached_behavior_t flag
)
417 case MEMCACHED_BEHAVIOR_NO_BLOCK
: return "MEMCACHED_BEHAVIOR_NO_BLOCK";
418 case MEMCACHED_BEHAVIOR_TCP_NODELAY
: return "MEMCACHED_BEHAVIOR_TCP_NODELAY";
419 case MEMCACHED_BEHAVIOR_HASH
: return "MEMCACHED_BEHAVIOR_HASH";
420 case MEMCACHED_BEHAVIOR_KETAMA
: return "MEMCACHED_BEHAVIOR_KETAMA";
421 case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE
: return "MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE";
422 case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE
: return "MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE";
423 case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS
: return "MEMCACHED_BEHAVIOR_CACHE_LOOKUPS";
424 case MEMCACHED_BEHAVIOR_SUPPORT_CAS
: return "MEMCACHED_BEHAVIOR_SUPPORT_CAS";
425 case MEMCACHED_BEHAVIOR_POLL_TIMEOUT
: return "MEMCACHED_BEHAVIOR_POLL_TIMEOUT";
426 case MEMCACHED_BEHAVIOR_DISTRIBUTION
: return "MEMCACHED_BEHAVIOR_DISTRIBUTION";
427 case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS
: return "MEMCACHED_BEHAVIOR_BUFFER_REQUESTS";
428 case MEMCACHED_BEHAVIOR_USER_DATA
: return "MEMCACHED_BEHAVIOR_USER_DATA";
429 case MEMCACHED_BEHAVIOR_SORT_HOSTS
: return "MEMCACHED_BEHAVIOR_SORT_HOSTS";
430 case MEMCACHED_BEHAVIOR_VERIFY_KEY
: return "MEMCACHED_BEHAVIOR_VERIFY_KEY";
431 case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT
: return "MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT";
432 case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT
: return "MEMCACHED_BEHAVIOR_RETRY_TIMEOUT";
433 case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED
: return "MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED";
434 case MEMCACHED_BEHAVIOR_KETAMA_HASH
: return "MEMCACHED_BEHAVIOR_KETAMA_HASH";
435 case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL
: return "MEMCACHED_BEHAVIOR_BINARY_PROTOCOL";
436 case MEMCACHED_BEHAVIOR_SND_TIMEOUT
: return "MEMCACHED_BEHAVIOR_SND_TIMEOUT";
437 case MEMCACHED_BEHAVIOR_RCV_TIMEOUT
: return "MEMCACHED_BEHAVIOR_RCV_TIMEOUT";
438 case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT
: return "MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT";
439 case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK
: return "MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK";
440 case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK
: return "MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK";
441 case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH
: return "MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH";
442 case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY
: return "MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY";
443 case MEMCACHED_BEHAVIOR_NOREPLY
: return "MEMCACHED_BEHAVIOR_NOREPLY";
444 case MEMCACHED_BEHAVIOR_USE_UDP
: return "MEMCACHED_BEHAVIOR_USE_UDP";
445 case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS
: return "MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS";
446 case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS
: return "MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS";
447 case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ
: return "MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ";
448 case MEMCACHED_BEHAVIOR_CORK
: return "MEMCACHED_BEHAVIOR_CORK";
449 case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE
: return "MEMCACHED_BEHAVIOR_TCP_KEEPALIVE";
450 case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE
: return "MEMCACHED_BEHAVIOR_TCP_KEEPIDLE";
451 case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE
: return "MEMCACHED_BEHAVIOR_LOAD_FROM_FILE";
453 case MEMCACHED_BEHAVIOR_MAX
: return "INVALID memcached_behavior_t";
457 const char *libmemcached_string_distribution(const memcached_server_distribution_t flag
)
461 case MEMCACHED_DISTRIBUTION_MODULA
: return "MEMCACHED_DISTRIBUTION_MODULA";
462 case MEMCACHED_DISTRIBUTION_CONSISTENT
: return "MEMCACHED_DISTRIBUTION_CONSISTENT";
463 case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA
: return "MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA";
464 case MEMCACHED_DISTRIBUTION_RANDOM
: return "MEMCACHED_DISTRIBUTION_RANDOM";
465 case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY
: return "MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY";
466 case MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED
: return "MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED";
467 case MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET
: return "MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET";
469 case MEMCACHED_DISTRIBUTION_CONSISTENT_MAX
: return "INVALID memcached_server_distribution_t";
473 memcached_return_t
memcached_bucket_set(memcached_st
*self
,
474 const uint32_t *host_map
,
475 const uint32_t *forward_map
,
476 const uint32_t buckets
,
477 const uint32_t replicas
)
479 memcached_return_t rc
;
482 return MEMCACHED_INVALID_ARGUMENTS
;
485 return MEMCACHED_INVALID_ARGUMENTS
;
487 memcached_server_distribution_t old
;
488 old
= memcached_behavior_get_distribution(self
);
490 rc
=memcached_behavior_set_distribution(self
, MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET
);
491 if (rc
!= MEMCACHED_SUCCESS
)
496 rc
= memcached_virtual_bucket_create(self
, host_map
, forward_map
, buckets
, replicas
);
497 if (rc
!= MEMCACHED_SUCCESS
)
499 memcached_behavior_set_distribution(self
, old
);