region

Documentation

Overview

Package region contains data structures to represent HBase regions.

Index

• Constants
• Variables
• func Compare(a, b []byte) int
• func CompareGeneric(a, b interface{}) int
• func NewClient(addr string, ctype ClientType, queueSize int, flushInterval time.Duration, ...) hrpc.RegionClient
• func NewInfo(id uint64, namespace, table, name, startKey, stopKey []byte) hrpc.RegionInfo
• func ParseRegionInfo(metaRow *hrpc.Result) (hrpc.RegionInfo, string, error)
• type ClientType
• type NotServingRegionError
  • func (e NotServingRegionError) Error() string
• type OfflineRegionError
  • func (e OfflineRegionError) Error() string
• type RetryableError
  • func (e RetryableError) Error() string
• type ServerError
  • func (e ServerError) Error() string

Constants

const (
	//DefaultLookupTimeout is the default region lookup timeout
	DefaultLookupTimeout = 30 * time.Second
	//DefaultReadTimeout is the default region read timeout
	DefaultReadTimeout = 30 * time.Second
	// RegionClient is a ClientType that means this will be a normal client
	RegionClient = ClientType("ClientService")

	// MasterClient is a ClientType that means this client will talk to the
	// master server
	MasterClient = ClientType("MasterService")
)

Variables

var (
	// ErrMissingCallID is used when HBase sends us a response message for a
	// request that we didn't send
	ErrMissingCallID = ServerError{errors.New("got a response with a nonsensical call ID")}

	// ErrClientClosed is returned to rpcs when Close() is called or when client
	// died because of failed send or receive
	ErrClientClosed = ServerError{errors.New("client is closed")}
)

Functions

func Compare

func Compare(a, b []byte) int

Compare compares two region names. We can't just use bytes.Compare() because it doesn't play nicely with the way META keys are built as the first region has an empty start key. Let's assume we know about those 2 regions in our cache:

.META.,,1
tableA,,1273018455182

We're given an RPC to execute on "tableA", row "\x00" (1 byte row key containing a 0). If we use Compare() to sort the entries in the cache, when we search for the entry right before "tableA,\000,:" we'll erroneously find ".META.,,1" instead of the entry for first region of "tableA".

Since this scheme breaks natural ordering, we need this comparator to implement a special version of comparison to handle this scenario.

func CompareGeneric

func CompareGeneric(a, b interface{}) int

CompareGeneric is the same thing as Compare but for interface{}.

func NewClient

func NewClient(addr string, ctype ClientType, queueSize int, flushInterval time.Duration,
	effectiveUser string, readTimeout time.Duration, codec compression.Codec) hrpc.RegionClient

NewClient creates a new RegionClient.

func NewInfo

func NewInfo(id uint64, namespace, table, name, startKey, stopKey []byte) hrpc.RegionInfo

NewInfo creates a new region info

func ParseRegionInfo

func ParseRegionInfo(metaRow *hrpc.Result) (hrpc.RegionInfo, string, error)

ParseRegionInfo parses the contents of a row from the meta table. It's guaranteed to return a region info and a host:port OR return an error.

Types

type ClientType

type ClientType string

ClientType is a type alias to represent the type of this region client

type NotServingRegionError

type NotServingRegionError struct {
	// contains filtered or unexported fields
}

NotServingRegionError is an error that indicates the client should reestablish the region and retry the RPC potentially via a different client

func (NotServingRegionError) Error

func (e NotServingRegionError) Error() string

type OfflineRegionError

type OfflineRegionError struct {
	// contains filtered or unexported fields
}

OfflineRegionError is returned if region is offline

func (OfflineRegionError) Error

func (e OfflineRegionError) Error() string

type RetryableError

type RetryableError struct {
	// contains filtered or unexported fields
}

RetryableError is an error that indicates the RPC should be retried after backoff because the error is transient (e.g. a region being momentarily unavailable).

func (RetryableError) Error

func (e RetryableError) Error() string

type ServerError

type ServerError struct {
	// contains filtered or unexported fields
}

ServerError is an error that this region.Client can't recover from. The connection to the RegionServer has to be closed and all queued and outstanding RPCs will be failed / retried.

func (ServerError) Error

func (e ServerError) Error() string