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Commit 65e96e52 authored by jon@gigan's avatar jon@gigan
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Documentation edits/fixes/cleanup for Alcatel docs.

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ndb/include/mgmapi/mgmapi.h
View file @ 65e96e52
......@@ -18,44 +18,44 @@
#define MGMAPI_H
/**
* @mainpage NDB Cluster Management API
* @mainpage MySQL Cluster Management API
*
* The NDB Cluster Management API (MGM API) is a C API
* that is used to:
* - Start and stop database nodes (ndbd processes)
* - Start and stop NDB Cluster backups
* - Control the NDB Cluster log
* - Perform other administrative tasks
* The MySQL Cluster Management API (MGM API) is a C language API
* that is used for:
* - Starting and stopping database nodes (ndbd processes)
* - Starting and stopping Cluster backups
* - Controlling the NDB Cluster log
* - Performing other administrative tasks
*
* @section General Concepts
*
* Each MGM API function needs a management server handle
* of type @ref NdbMgmHandle.
* This handle is initally created by calling the
* This handle is created by calling the function
* function ndb_mgm_create_handle() and freed by calling
* ndb_mgm_destroy_handle().
*
* A function can return:
* -# An integer value.
* A value of <b>-1</b> indicates an error.
* -# A non-const pointer value. A <var>NULL</var> value indicates an error;
* A function can return any of the following:
* -# An integer value, with
* a value of <b>-1</b> indicating an error.
* -# A non-constant pointer value. A <var>NULL</var> value indicates an error;
* otherwise, the return value must be freed
* by the user of the MGM API
* -# A const pointer value. A <var>NULL</var> value indicates an error.
* Returned value should not be freed.
* by the programmer
* -# A constant pointer value, with a <var>NULL</var> value indicating an error.
* The returned value should <em>not</em> be freed.
*
* Error conditions can be identified by using the appropriate
* error-reporting functions ndb_mgm_get_latest_error() and
* @ref ndb_mgm_error.
*
* Below is an example of usage (without error handling for brevity).
* Here is an example using the MGM API (without error handling for brevity's sake).
* @code
* NdbMgmHandle handle= ndb_mgm_create_handle();
* ndb_mgm_connect(handle,0,0,0);
* struct ndb_mgm_cluster_state *state= ndb_mgm_get_status(handle);
* for(int i=0; i < state->no_of_nodes; i++)
* {
* printf("node with id=%d ", state->node_states[i].node_id);
* printf("node with ID=%d ", state->node_states[i].node_id);
* if(state->node_states[i].version != 0)
* printf("connected\n");
* else
......@@ -234,10 +234,10 @@ extern "C" {
* returned by ndb_mgm_get_status()
*
* @note @ref node_status, @ref start_phase, @ref dynamic_id
* and @ref node_group are only relevant for database nodes
* and @ref node_group are relevant only for database nodes
*/
struct ndb_mgm_node_state {
/** NDB Cluster node id*/
/** NDB Cluster node ID*/
int node_id;
/** Type of NDB Cluster node*/
enum ndb_mgm_node_type node_type;
......@@ -245,12 +245,12 @@ extern "C" {
enum ndb_mgm_node_status node_status;
/** Start phase.
*
* @note Start phase is only valid if node_type is
* NDB_MGM_NODE_TYPE_NDB and node_status is
* @note Start phase is only valid if the <var>node_type</var> is
* NDB_MGM_NODE_TYPE_NDB and the <var>node_status</var> is
* NDB_MGM_NODE_STATUS_STARTING
*/
int start_phase;
/** Id for heartbeats and master take-over (only valid for DB nodes)
/** ID for heartbeats and master take-over (only valid for DB nodes)
*/
int dynamic_id;
/** Node group of node (only valid for DB nodes)*/
......@@ -261,9 +261,9 @@ extern "C" {
* management server
*/
int connect_count;
/** Ip adress of node when it connected to the management server.
* @note it will be empty if the management server has restarted
* after the node connected.
/** IP address of node when it connected to the management server.
* @note This value will be empty if the management server has restarted
* since the node last connected.
*/
char connect_address[
#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
......@@ -273,11 +273,11 @@ extern "C" {
};
/**
* State of all nodes in the cluster returned from
* State of all nodes in the cluster; returned from
* ndb_mgm_get_status()
*/
struct ndb_mgm_cluster_state {
/** No of entries in the node_states array */
/** Number of entries in the node_states array */
int no_of_nodes;
/** An array with node_states*/
struct ndb_mgm_node_state node_states[
......@@ -288,7 +288,7 @@ extern "C" {
};
/**
* Default reply from the server (for future use, not used today)
* Default reply from the server (reserved for future use)
*/
struct ndb_mgm_reply {
/** 0 if successful, otherwise error code. */
......@@ -325,21 +325,21 @@ extern "C" {
#endif
/**
* Log severities (used to filter the cluster log)
* Log severity of errors. (Used to filter the cluster log.)
*/
enum ndb_mgm_clusterlog_level {
NDB_MGM_ILLEGAL_CLUSTERLOG_LEVEL = -1,
/* must range from 0 and up, indexes into an array */
/* Must be a nonnegative integer (used for array indexing) */
/** Cluster log on*/
NDB_MGM_CLUSTERLOG_ON = 0,
/** Used in NDB Cluster developement */
NDB_MGM_CLUSTERLOG_DEBUG = 1,
/** Informational messages*/
NDB_MGM_CLUSTERLOG_INFO = 2,
/** Conditions that are not error condition, but might require handling
/** Conditions that are not error condition, but might require special handling.
*/
NDB_MGM_CLUSTERLOG_WARNING = 3,
/** Conditions that should be corrected */
/** Conditions that, while not fatal, should be corrected. */
NDB_MGM_CLUSTERLOG_ERROR = 4,
/** Critical conditions, like device errors or out of resources */
NDB_MGM_CLUSTERLOG_CRITICAL = 5,
......@@ -353,7 +353,7 @@ extern "C" {
};
/**
* Log categories, used to set filter on the clusterlog using
* Log categories, used in setting filters on the clusterlog using
* ndb_mgm_set_loglevel_clusterlog()
*/
enum ndb_mgm_event_category {
......@@ -362,11 +362,11 @@ extern "C" {
*/
NDB_MGM_ILLEGAL_EVENT_CATEGORY = -1,
/**
* Events during all kinds of startups
* Startup events
*/
NDB_MGM_EVENT_CATEGORY_STARTUP = CFG_LOGLEVEL_STARTUP,
/**
* Events during shutdown
* Shutdown events
*/
NDB_MGM_EVENT_CATEGORY_SHUTDOWN = CFG_LOGLEVEL_SHUTDOWN,
/**
......@@ -374,15 +374,15 @@ extern "C" {
*/
NDB_MGM_EVENT_CATEGORY_STATISTIC = CFG_LOGLEVEL_STATISTICS,
/**
* Events regarding checkpoints
* Checkpoint events
*/
NDB_MGM_EVENT_CATEGORY_CHECKPOINT = CFG_LOGLEVEL_CHECKPOINT,
/**
* Events during node restart
* Node restart events
*/
NDB_MGM_EVENT_CATEGORY_NODE_RESTART = CFG_LOGLEVEL_NODERESTART,
/**
* Events on connection between cluster nodes
* Cluster node connection events
*/
NDB_MGM_EVENT_CATEGORY_CONNECTION = CFG_LOGLEVEL_CONNECTION,
/**
......@@ -424,7 +424,8 @@ extern "C" {
*/
/**
* Get latest error associated with a management server handle
* Get the most recent error associated with the management server whose handle
* is used as the value of <var>handle</var>.
*
* @param handle Management handle
* @return Latest error code
......@@ -432,7 +433,7 @@ extern "C" {
int ndb_mgm_get_latest_error(const NdbMgmHandle handle);
/**
* Get latest main error message associated with a handle
* Get the most recent general error message associated with a handle
*
* @param handle Management handle.
* @return Latest error message
......@@ -440,9 +441,9 @@ extern "C" {
const char * ndb_mgm_get_latest_error_msg(const NdbMgmHandle handle);
/**
* Get latest error description associated with a handle
* Get the most recent error description associated with a handle
*
* The error description gives some additional information to
* The error description gives some additional information regarding
* the error message.
*
* @param handle Management handle.
......@@ -452,7 +453,7 @@ extern "C" {
#ifndef DOXYGEN_SHOULD_SKIP_DEPRECATED
/**
* Get latest internal source code error line associated with a handle
* Get the most recent internal source code error line associated with a handle
*
* @param handle Management handle.
* @return Latest internal source code line of latest error
......@@ -468,15 +469,15 @@ extern "C" {
*/
/**
* Create a handle to a management server
* Create a handle to a management server.
*
* @return A management handle<br>
* or NULL if no management handle could be created.
* or <var>NULL</var> if no management handle could be created.
*/
NdbMgmHandle ndb_mgm_create_handle();
/**
* Destroy a management server handle
* Destroy a management server handle.
*
* @param handle Management handle
*/
......@@ -489,7 +490,7 @@ extern "C" {
*/
/**
* Set connect string to management server
* Sets the connectstring for a management server
*
* @param handle Management handle
* @param connect_string Connect string to the management server,
......@@ -500,19 +501,19 @@ extern "C" {
* <connectstring> := [<nodeid-specification>,]<host-specification>[,<host-specification>]
* <nodeid-specification> := nodeid=<id>
* <host-specification> := <host>[:<port>]
* <id> is an integer larger than 1 identifying a node in config.ini
* <id> is an integer greater than 1 identifying a node in config.ini
* <port> is an integer referring to a regular unix port
* <host> is a string which is a valid Internet host address
* <host> is a string containing a valid network host address
* @endcode
*/
int ndb_mgm_set_connectstring(NdbMgmHandle handle,
const char *connect_string);
/**
* Get connectstring used for connection
* Gets the connectstring used for a connection
*
* @note returns what the connectstring defaults to if the
* ndb_mgm_set_connectstring() call has not been performed
* @note This function returns the default connectstring if no call to
* ndb_mgm_set_connectstring() has been performed
*
* @param handle Management handle
*
......@@ -521,7 +522,7 @@ extern "C" {
const char *ndb_mgm_get_connectstring(NdbMgmHandle handle, char *buf, int buf_sz);
/**
* Connect to a management server. Coonect string is set by
* Connects to a management server. Connectstring is set by
* ndb_mgm_set_connectstring().
*
* @param handle Management handle.
......@@ -531,7 +532,7 @@ extern "C" {
int retry_delay_in_seconds, int verbose);
/**
* Disconnect from a management server
* Disconnects from a management server
*
* @param handle Management handle.
* @return -1 on error.
......@@ -539,17 +540,17 @@ extern "C" {
int ndb_mgm_disconnect(NdbMgmHandle handle);
/**
* Get nodeid used in the connection
* Gets connection node ID
*
* @param handle Management handle
*
* @return node id, 0 indicated that no nodeid has been
* @return Node ID; 0 indicates that no node ID has been
* specified
*/
int ndb_mgm_get_configuration_nodeid(NdbMgmHandle handle);
/**
* Get port used in the connection
* Gets connection port
*
* @param handle Management handle
*
......@@ -558,7 +559,7 @@ extern "C" {
int ndb_mgm_get_connected_port(NdbMgmHandle handle);
/**
* Get host used in the connection
* Gets connection host
*
* @param handle Management handle
*
......@@ -569,12 +570,12 @@ extern "C" {
#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
/** @} *********************************************************************/
/**
* @name Functions: Convert between different data formats
* @name Functions: Used to convert between different data formats
* @{
*/
/**
* Convert a string to a ndb_mgm_node_type
* Converts a string to an <var>ndb_mgm_node_type</var> value
*
* @param type Node type as string.
* @return NDB_MGM_NODE_TYPE_UNKNOWN if invalid string.
......@@ -582,24 +583,24 @@ extern "C" {
enum ndb_mgm_node_type ndb_mgm_match_node_type(const char * type);
/**
* Convert an ndb_mgm_node_type to a string
* Converts an ndb_mgm_node_type to a string
*
* @param type Node type.
* @return NULL if invalid id.
* @return <var>NULL</var> if invalid ID.
*/
const char * ndb_mgm_get_node_type_string(enum ndb_mgm_node_type type);
/**
* Convert an ndb_mgm_node_type to a alias string
* Converts an ndb_mgm_node_type to a alias string
*
* @param type Node type.
* @return NULL if invalid id.
* @return <var>NULL</var> if the ID is invalid.
*/
const char * ndb_mgm_get_node_type_alias_string(enum ndb_mgm_node_type type,
const char **str);
/**
* Convert a string to a ndb_mgm_node_status
* Converts a string to a <var>ndb_mgm_node_status</var> value
*
* @param status NDB node status string.
* @return NDB_MGM_NODE_STATUS_UNKNOWN if invalid string.
......@@ -607,10 +608,10 @@ extern "C" {
enum ndb_mgm_node_status ndb_mgm_match_node_status(const char * status);
/**
* Convert an id to a string
* Converts an ID to a string
*
* @param status NDB node status.
* @return NULL if invalid id.
* @return <var>NULL</var> if invalid ID.
*/
const char * ndb_mgm_get_node_status_string(enum ndb_mgm_node_status status);
......@@ -621,18 +622,18 @@ extern "C" {
/** @} *********************************************************************/
/**
* @name Functions: State of cluster
* @name Functions: Cluster status
* @{
*/
/**
* Get status of the nodes in an NDB Cluster
* Gets status of the nodes in an NDB Cluster
*
* Note the caller must free the pointer returned.
* @note The caller must free the pointer returned by this function.
*
* @param handle Management handle.
*
* @return Cluster state (or NULL on error).
* @return Cluster state (or <var>NULL</var> on error).
*/
struct ndb_mgm_cluster_state * ndb_mgm_get_status(NdbMgmHandle handle);
......@@ -643,36 +644,36 @@ extern "C" {
*/
/**
* Stop database nodes
* Stops database nodes
*
* @param handle Management handle.
* @param no_of_nodes no of database nodes<br>
* 0 - means all database nodes in cluster<br>
* n - Means stop n node(s) specified in the
* @param no_of_nodes Number of database nodes to be stopped<br>
* 0: All database nodes in cluster<br>
* n: Stop the <var>n</var> node(s) specified in the
* array node_list
* @param node_list List of node ids of database nodes to be stopped
* @param node_list List of node IDs for database nodes to be stopped
*
* @return No of nodes stopped (or -1 on error)
* @return Number of nodes stopped (-1 on error)
*
* @note The function is equivalent
* to ndb_mgm_stop2(handle, no_of_nodes, node_list, 0)
* @note This function is equivalent
* to calling ndb_mgm_stop2(handle, no_of_nodes, node_list, 0)
*/
int ndb_mgm_stop(NdbMgmHandle handle, int no_of_nodes,
const int * node_list);
/**
* Stop database nodes
* Stops database nodes
*
* @param handle Management handle.
* @param no_of_nodes No of database nodes<br>
* 0 - means all database nodes in cluster<br>
* n - Means stop n node(s) specified in
* @param no_of_nodes Number of database nodes to stop<br>
* 0: All database nodes in cluster<br>
* n: Stop the <var>n</var> node(s) specified in
* the array node_list
* @param node_list List of node ids of database nodes to be stopped
* @param abort Don't perform gracefull stop,
* but rather stop immediatly
* @param node_list List of node IDs of database nodes to be stopped
* @param abort Don't perform graceful stop,
* but rather stop immediately
*
* @return No of nodes stopped (or -1 on error).
* @return Number of nodes stopped (-1 on error).
*/
int ndb_mgm_stop2(NdbMgmHandle handle, int no_of_nodes,
const int * node_list, int abort);
......@@ -681,15 +682,15 @@ extern "C" {
* Restart database nodes
*
* @param handle Management handle.
* @param no_of_nodes No of database nodes<br>
* 0 - means all database nodes in cluster<br>
* n - Means stop n node(s) specified in the
* @param no_of_nodes Number of database nodes to restart<br>
* 0: All database nodes in cluster<br>
* n: Restart the <var>n</var> node(s) specified in the
* array node_list
* @param node_list List of node ids of database nodes to be stopped
* @param node_list List of node IDs of database nodes to be restarted
*
* @return No of nodes stopped (or -1 on error).
* @return Number of nodes restarted (-1 on error).
*
* @note The function is equivalent to
* @note This function is equivalent to calling
* ndb_mgm_restart2(handle, no_of_nodes, node_list, 0, 0, 0);
*/
int ndb_mgm_restart(NdbMgmHandle handle, int no_of_nodes,
......@@ -699,18 +700,18 @@ extern "C" {
* Restart database nodes
*
* @param handle Management handle.
* @param no_of_nodes No of database nodes<br>
* 0 - means all database nodes in cluster<br>
* n - Means stop n node(s) specified in the
* @param no_of_nodes Number of database nodes to be restarted:<br>
* 0: Restart all database nodes in the cluster<br>
* n: Restart the <var>n</var> node(s) specified in the
* array node_list
* @param node_list List of node ids of database nodes to be stopped
* @param initial Remove filesystem from node(s) restarting
* @param node_list List of node IDs of database nodes to be restarted
* @param initial Remove filesystem from restarting node(s)
* @param nostart Don't actually start node(s) but leave them
* waiting for start command
* @param abort Don't perform gracefull restart,
* but rather restart immediatly
* @param abort Don't perform graceful restart,
* but rather restart immediately
*
* @return No of nodes stopped (or -1 on error).
* @return Number of nodes stopped (-1 on error).
*/
int ndb_mgm_restart2(NdbMgmHandle handle, int no_of_nodes,
const int * node_list, int initial,
......@@ -720,19 +721,19 @@ extern "C" {
* Start database nodes
*
* @param handle Management handle.
* @param no_of_nodes No of database nodes<br>
* 0 - means all database nodes in cluster<br>
* n - Means start n node(s) specified in
* @param no_of_nodes Number of database nodes to be started<br>
* 0: Start all database nodes in the cluster<br>
* n: Start the <var>n</var> node(s) specified in
* the array node_list
* @param node_list List of node ids of database nodes to be started
* @param node_list List of node IDs of database nodes to be started
*
* @return No of nodes started (or -1 on error).
* @return Number of nodes actually started (-1 on error).
*
* @note The nodes to start must have been started with nostart(-n)
* @note The nodes to be started must have been started with nostart(-n)
* argument.
* This means that the database node binary is started and
* waiting for a START management command which will
* actually start the database node functionality
* actually enable the database node
*/
int ndb_mgm_start(NdbMgmHandle handle,
int no_of_nodes,
......@@ -749,7 +750,7 @@ extern "C" {
*
* @param handle NDB management handle.
* @param level A cluster log level to filter.
* @param enable set 1=enable 0=disable
* @param enable Set 1=enable or 0=disable
* @param reply Reply message.
*
* @return -1 on error.
......@@ -766,13 +767,13 @@ extern "C" {
*
* @return A vector of seven elements,
* where each element contains
* 1 if a severity is enabled and 0 if not.
* A severity is stored at position
* ndb_mgm_clusterlog_level,
* 1 if a severity indicator is enabled and 0 if not.
* A severity level is stored at position
* ndb_mgm_clusterlog_level;
* for example the "error" level is stored in position
* [NDB_MGM_CLUSTERLOG_ERROR-1].
* The first element in the vector signals
* whether the clusterlog
* whether the cluster log
* is disabled or enabled.
*/
unsigned int *ndb_mgm_get_logfilter(NdbMgmHandle handle);
......@@ -781,7 +782,7 @@ extern "C" {
* Set log category and levels for the cluster log
*
* @param handle NDB management handle.
* @param nodeId Node id.
* @param nodeId Node ID.
* @param category Event category.
* @param level Log level (0-15).
* @param reply Reply message.
......@@ -796,10 +797,10 @@ extern "C" {
/**
* Listen to log events
*
* @param filter pairs of { level, ndb_mgm_event_category } that will be
* pushed to fd, level=0 ends lists
* @param filter pairs of { level, ndb_mgm_event_category } that will be
* pushed to fd, level=0 ends lists
*
* @return fd which events will be pushed to
* @return fd which events will be pushed to the log
*/
int ndb_mgm_listen_event(NdbMgmHandle handle, int filter[]);
......@@ -808,7 +809,7 @@ extern "C" {
* Set log category and levels for the Node
*
* @param handle NDB management handle.
* @param nodeId Node id.
* @param nodeId Node ID.
* @param category Event category.
* @param level Log level (0-15).
* @param reply Reply message.
......@@ -840,13 +841,13 @@ extern "C" {
/**
* Start backup
*
* @param handle NDB management handle.
* @param wait_completed 0=don't wait for confirmation,
* 1=wait for backup started,
* 2=wait for backup completed
* @param backup_id Backup id is returned from function.
* @param reply Reply message.
* @return -1 on error.
* @param handle NDB management handle.
* @param wait_completed 0: Don't wait for confirmation<br>
* 1: Wait for backup to be started<br>
* 2: Wait for backup to be completed
* @param backup_id Backup ID is returned from function.
* @param reply Reply message.
* @return -1 on error.
*/
int ndb_mgm_start_backup(NdbMgmHandle handle, int wait_completed,
unsigned int* backup_id,
......@@ -856,7 +857,7 @@ extern "C" {
* Abort backup
*
* @param handle NDB management handle.
* @param backup_id Backup Id.
* @param backup_id Backup ID.
* @param reply Reply message.
* @return -1 on error.
*/
......@@ -874,7 +875,7 @@ extern "C" {
* Enter Single user mode
*
* @param handle NDB management handle.
* @param nodeId Node Id of the single user node
* @param nodeId Node ID of the single user node
* @param reply Reply message.
* @return -1 on error.
*/
......@@ -885,7 +886,7 @@ extern "C" {
* Exit Single user mode
*
* @param handle NDB management handle.
* @param nodeId Node Id of the single user node
* @param nodeId Node ID of the single user node
* @param reply Reply message.
*
* @return -1 on error.
......@@ -904,11 +905,11 @@ extern "C" {
* Get configuration
* @param handle NDB management handle.
* @param version Version of configuration, 0 means latest
* (which is the only supported input at this point)
* (Currently this is the only supported value for this parameter)
*
* @return configuration
*
* @note the caller must call ndb_mgm_destroy_configuration()
* @note The caller is responsible for calling ndb_mgm_destroy_configuration()
*/
struct ndb_mgm_configuration * ndb_mgm_get_configuration(NdbMgmHandle handle,
unsigned version);
......
ndb/include/ndbapi/Ndb.hpp
View file @ 65e96e52
......@@ -51,20 +51,20 @@
The procedure for using transactions is as follows:
-# Start transaction (instantiate an NdbTransaction object)
-# Add and define operations associated with the transaction using the
NdbOperation, NdbScanOperation, NdbIndexOperation, and NdbIndexScanOperation classes.
-# Execute transaction
-# Add and define operations associated with the transaction using instances of one or more of the
NdbOperation, NdbScanOperation, NdbIndexOperation, and NdbIndexScanOperation classes
-# Execute transaction (call NdbTransaction::execute())
The execution can be of two different types,
The operation can be of two different types,
<var>Commit</var> or <var>NoCommit</var>.
If the execution is of type <var>NoCommit</var>,
then the application program executes part of a transaction,
If the operation is of type <var>NoCommit</var>,
then the application program executes the operation part of a transaction,
but without actually committing the transaction.
After executing a <var>NoCommit</var> transaction, the program can continue
After executing a <var>NoCommit</var> operation, the program can continue
to add and define more operations to the transaction
for later execution.
If the execute is of type <var>Commit</var>, then the transaction is
If the operation is of type <var>Commit</var>, then the transaction is
immediately committed. The transaction <em>must</em> be closed after it has been
commited (event if commit fails), and no further addition or definition of
operations for this transaction is allowed.
......@@ -78,15 +78,16 @@
(typically created using Ndb::startTransaction()).
At this point, the transaction is only being defined,
and is not yet sent to the NDB kernel.
-# Define operations and add them to the transaction, using
NdbTransaction::getNdbOperation(),
NdbTransaction::getNdbScanOperation(),
NdbTransaction::getNdbIndexOperation(), or
NdbTransaction::getNdbIndexScanOperation(),
and methods of the respective NdbOperation class.
-# Define operations and add them to the transaction, using one or more of
- NdbTransaction::getNdbOperation()
- NdbTransaction::getNdbScanOperation()
- NdbTransaction::getNdbIndexOperation()
- NdbTransaction::getNdbIndexScanOperation()
along with the appropriate methods of the respective NdbOperation class
(or one possiblt one or more of its subclasses).
Note that the transaction has still not yet been sent to the NDB kernel.
-# Execute the transaction, using the NdbTransaction::execute() method.
-# Close the transaction (using Ndb::closeTransaction()).
-# Close the transaction (call Ndb::closeTransaction()).
For an example of this process, see the program listing in
@ref ndbapi_simple.cpp.
......
ndb/include/ndbapi/ndb_cluster_connection.hpp
View file @ 65e96e52
......@@ -20,14 +20,14 @@
/**
* @class Ndb_cluster_connection
* @brief Represents a connection to a cluster of storage nodes
* @brief Represents a connection to a cluster of storage nodes.
*
* Always start your application program by creating a
* Ndb_cluster_connection object. Your application should contain
* only one Ndb_cluster_connection. Your application connects to
* a cluster management server when method connect() is called.
* With the method wait_until_ready() it is possible to wait
* for the connection to one or several storage nodes.
* Any NDB application program should begin with the creation of a
* single Ndb_cluster_connection object, and should make use of one
* and only one Ndb_cluster_connection. The application connects to
* a cluster management server when this object's connect() method is called.
* By using the wait_until_ready() method it is possible to wait
* for the connection to reach one or more storage nodes.
*/
class Ndb_cluster_connection {
public:
......@@ -43,16 +43,19 @@ public:
/**
* Connect to a cluster management server
*
* @param no_retries specifies the number of retries to perform
* if the connect fails, negative number results in infinite
* number of retries
* @param no_retries specifies the number of retries to attempt
* in the event of connection failure; a negative value
* will result in the attempt to connect being repeated
* indefinitely
*
* @param retry_delay_in_seconds specifies how often retries should
* be performed
* @param verbose specifies if the method should print progess
*
* @return 0 if success,
* 1 if retriable error,
* -1 if non-retriable error
* @param verbose specifies if the method should print a report of its progess
*
* @return 0 = success,
* 1 = recoverable error,
* -1 = non-recoverable error
*/
int connect(int no_retries=0, int retry_delay_in_seconds=1, int verbose=0);
......@@ -61,15 +64,15 @@ public:
#endif
/**
* Wait until one or several storage nodes are connected
* Wait until the requested connection with one or more storage nodes is successful
*
* @param time_out_for_first_alive number of seconds to wait until
* first alive node is detected
* first live node is detected
* @param timeout_after_first_alive number of seconds to wait after
* first alive node is detected
* first live node is detected
*
* @return 0 all nodes alive,
* > 0 at least one node alive,
* @return = 0 all nodes live,
* > 0 at least one node live,
* < 0 error
*/
int wait_until_ready(int timeout_for_first_alive,
......
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