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Published: May 22, 2017 License: BSD-3-Clause Imports: 17 Imported by: 0




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var ErrConnPoolClosed = vterrors.New(vtrpcpb.Code_INTERNAL, "internal error: unexpected: conn pool is closed")

ErrConnPoolClosed is returned when the connection pool is closed.


This section is empty.


type DBConn

type DBConn struct {
	// contains filtered or unexported fields

DBConn is a db connection for tabletserver. It performs automatic reconnects as needed. Its Execute function has a timeout that can kill its own queries and the underlying connection. It will also trigger a CheckMySQL whenever applicable.

func NewDBConn

func NewDBConn(
	cp *Pool,
	dbaParams *sqldb.ConnParams) (*DBConn, error)

NewDBConn creates a new DBConn. It triggers a CheckMySQL if creation fails.

func (*DBConn) Close

func (dbc *DBConn) Close()

Close closes the DBConn.

func (*DBConn) Current

func (dbc *DBConn) Current() string

Current returns the currently executing query.

func (*DBConn) Exec

func (dbc *DBConn) Exec(ctx context.Context, query string, maxrows int, wantfields bool) (*sqltypes.Result, error)

Exec executes the specified query. If there is a connection error, it will reconnect and retry. A failed reconnect will trigger a CheckMySQL.

func (*DBConn) ExecOnce

func (dbc *DBConn) ExecOnce(ctx context.Context, query string, maxrows int, wantfields bool) (*sqltypes.Result, error)

ExecOnce executes the specified query, but does not retry on connection errors.

func (*DBConn) ID

func (dbc *DBConn) ID() int64

ID returns the connection id.

func (*DBConn) IsClosed

func (dbc *DBConn) IsClosed() bool

IsClosed returns true if DBConn is closed.

func (*DBConn) Kill

func (dbc *DBConn) Kill(reason string) error

Kill kills the currently executing query both on MySQL side and on the connection side. If no query is executing, it's a no-op. Kill will also not kill a query more than once.

func (*DBConn) Recycle

func (dbc *DBConn) Recycle()

Recycle returns the DBConn to the pool.

func (*DBConn) Stream

func (dbc *DBConn) Stream(ctx context.Context, query string, callback func(*sqltypes.Result) error, streamBufferSize int, includedFields querypb.ExecuteOptions_IncludedFields) error

Stream executes the query and streams the results.

func (*DBConn) VerifyMode

func (dbc *DBConn) VerifyMode() error

VerifyMode returns an error if the connection mode is incorrect.

type Pool

type Pool struct {
	// contains filtered or unexported fields

Pool implements a custom connection pool for tabletserver. It's similar to dbconnpool.ConnPool, but the connections it creates come with built-in ability to kill in-flight queries. These connections also trigger a CheckMySQL call if we fail to connect to MySQL. Other than the connection type, ConnPool maintains an additional pool of dba connections that are used to kill connections.

func New

func New(
	name string,
	capacity int,
	idleTimeout time.Duration,
	checker mysqlChecker) *Pool

New creates a new Pool. The name is used to publish stats only.

func (*Pool) Available

func (cp *Pool) Available() int64

Available returns the number of available connections in the pool

func (*Pool) Capacity

func (cp *Pool) Capacity() int64

Capacity returns the pool capacity.

func (*Pool) Close

func (cp *Pool) Close()

Close will close the pool and wait for connections to be returned before exiting.

func (*Pool) Get

func (cp *Pool) Get(ctx context.Context) (*DBConn, error)

Get returns a connection. You must call Recycle on DBConn once done.

func (*Pool) IdleTimeout

func (cp *Pool) IdleTimeout() time.Duration

IdleTimeout returns the idle timeout for the pool.

func (*Pool) MaxCap

func (cp *Pool) MaxCap() int64

MaxCap returns the maximum size of the pool

func (*Pool) Open

func (cp *Pool) Open(appParams, dbaParams *sqldb.ConnParams)

Open must be called before starting to use the pool.

func (*Pool) Put

func (cp *Pool) Put(conn *DBConn)

Put puts a connection into the pool.

func (*Pool) SetCapacity

func (cp *Pool) SetCapacity(capacity int) (err error)

SetCapacity alters the size of the pool at runtime.

func (*Pool) SetIdleTimeout

func (cp *Pool) SetIdleTimeout(idleTimeout time.Duration)

SetIdleTimeout sets the idleTimeout on the pool.

func (*Pool) StatsJSON

func (cp *Pool) StatsJSON() string

StatsJSON returns the pool stats as a JSON object.

func (*Pool) WaitCount

func (cp *Pool) WaitCount() int64

WaitCount returns how many clients are waiting for a connection

func (*Pool) WaitTime

func (cp *Pool) WaitTime() time.Duration

WaitTime return the pool WaitTime.

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