Added libmemcachedutil containing utility functions

[m6w6/libmemcached] / docs / memcached_behavior.pod

diff --git a/docs/memcached_behavior.pod b/docs/memcached_behavior.pod
index 51e09e71436236ddede4ece9abc6b09b02cdd0d4..f37f8a0cce7ee817d095ffd25100dfc68f0426e1 100755 (executable)
--- a/docs/memcached_behavior.pod
+++ b/docs/memcached_behavior.pod
@@ -37,12 +37,30 @@ memcached_behavior_set() will flush and reset all connections.
 
 =over 4
 
 
 =over 4
 

+=item MEMCACHED_BEHAVIOR_USE_UDP
+
+Causes libmemcached(3) to use the UDP transport when communicating
+with a memcached server. Not all I/O operations are supported 
+when this behavior is enababled. The following operations will return
+C<MEMCACHED_NOT_SUPPORTED> when executed with the MEMCACHED_BEHAVIOR_USE_UDP
+enabled: memcached_version(), memcached_stat(), memcached_get(),
+memcached_get_by_key(), memcached_mget(), memcached_mget_by_key(),
+memcached_fetch(), memcached_fetch_result(), memcached_value_fetch().
+
+All other operations are supported but are executed in a 'fire-and-forget'
+mode, in which once the client has executed the operation, no attempt
+will be made to ensure the operation has been received and acted on by the
+server. 
+
+libmemcached(3) does not allow TCP and UDP servers to be shared within
+the same libmemached(3) client 'instance'. An attempt to add a TCP server
+when this behavior is enabled will result in a C<MEMCACHED_INVALID_HOST_PROTOCOL>,
+as will attempting to add a UDP server when this behavior has not been enabled.
+

 =item MEMCACHED_BEHAVIOR_NO_BLOCK
 
 Causes libmemcached(3) to use asychronous IO. This is the fastest transport
 =item MEMCACHED_BEHAVIOR_NO_BLOCK
 
 Causes libmemcached(3) to use asychronous IO. This is the fastest transport

-available for storage functions. For read operations it is currently 
-similar in performance to the non-blocking method (this is being
-looked into).
+available for storage functions.

 
 =item MEMCACHED_BEHAVIOR_SND_TIMEOUT
 
 
 =item MEMCACHED_BEHAVIOR_SND_TIMEOUT
 


@@ -66,6 +84,7 @@ environments).
 Makes the default hashing algorithm for keys use MD5. The value can be set
 to either MEMCACHED_HASH_DEFAULT, MEMCACHED_HASH_MD5, MEMCACHED_HASH_CRC, MEMCACHED_HASH_FNV1_64, MEMCACHED_HASH_FNV1A_64, MEMCACHED_HASH_FNV1_32, MEMCACHED_HASH_FNV1A_32, MEMCACHED_HASH_JENKINS, MEMCACHED_HASH_HSIEH, and MEMCACHED_HASH_MURMUR. 
 Each hash has it's advantages and it's weaknesses. If you dont know or dont care, just go with the default.
 Makes the default hashing algorithm for keys use MD5. The value can be set
 to either MEMCACHED_HASH_DEFAULT, MEMCACHED_HASH_MD5, MEMCACHED_HASH_CRC, MEMCACHED_HASH_FNV1_64, MEMCACHED_HASH_FNV1A_64, MEMCACHED_HASH_FNV1_32, MEMCACHED_HASH_FNV1A_32, MEMCACHED_HASH_JENKINS, MEMCACHED_HASH_HSIEH, and MEMCACHED_HASH_MURMUR. 
 Each hash has it's advantages and it's weaknesses. If you dont know or dont care, just go with the default.

+Support for MEMCACHED_HASH_HSIEH is a compile time option that is disabled by default. To enable support for this hashing algorithm, configure and build libmemcached with the --enable-hash_hsieh. 

 
 =item MEMCACHED_BEHAVIOR_DISTRIBUTION
 
 
 =item MEMCACHED_BEHAVIOR_DISTRIBUTION
 


@@ -144,6 +163,37 @@ this flag on an open connection.
 Set this value to enable the server be removed after continuous MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT
 times connection failure.
 
 Set this value to enable the server be removed after continuous MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT
 times connection failure.
 

+=item MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK
+
+Set this value to tune the number of messages that may be sent before 
+libmemcached should start to automatically drain the input queue. Setting
+this value to high, may cause libmemcached to deadlock (trying to send data,
+but the send will block because the input buffer in the kernel is full).
+
+=item MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK
+
+Set this value to tune the number of bytes that may be sent before
+libmemcached should start to automatically drain the input queue (need
+at least 10 IO requests sent without reading the input buffer). Setting
+this value to high, may cause libmemcached to deadlock (trying to send 
+data, but the send will block because the input buffer in the kernel is full).
+
+=item MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH
+
+The binary protocol works a bit different than the textual protocol in
+that a multiget is implemented as a pipe of single get-operations which
+are sent to the server in a chunk. If you are using large multigets from
+your application, you may improve the latency of the gets by setting
+this value so you send out the first chunk of requests when you hit the
+specified limit.  It allows the servers to start processing the requests
+to send the data back while the rest of the requests are created and
+sent to the server.
+
+=item MEMCACHED_BEHAVIOR_NOREPLY
+
+Set this value to specify that you really don't care about the result
+from your storage commands (set, add, replace, append, prepend). 
+

 =back
 
 =head1 RETURN
 =back
 
 =head1 RETURN