testcluster

Documentation

Index

• Variables
• type ReplicationTarget
• type TestCluster
  • func StartTestCluster(t testing.TB, nodes int, args base.TestClusterArgs) *TestCluster
  • func (tc *TestCluster) AddReplicas(startKey roachpb.Key, targets ...ReplicationTarget) (*roachpb.RangeDescriptor, error)
  • func (tc *TestCluster) FindRangeLeaseHolder(rangeDesc *roachpb.RangeDescriptor, hint *ReplicationTarget) (ReplicationTarget, error)
  • func (tc *TestCluster) LookupRange(key roachpb.Key) (roachpb.RangeDescriptor, error)
  • func (tc *TestCluster) NumServers() int
  • func (tc *TestCluster) RemoveReplicas(startKey roachpb.Key, targets ...ReplicationTarget) (*roachpb.RangeDescriptor, error)
  • func (tc *TestCluster) Server(idx int) serverutils.TestServerInterface
  • func (tc *TestCluster) ServerConn(idx int) *gosql.DB
  • func (tc *TestCluster) SplitRange(splitKey roachpb.Key) (*roachpb.RangeDescriptor, *roachpb.RangeDescriptor, error)
  • func (tc *TestCluster) StopServer(idx int)
  • func (tc *TestCluster) Stopper() *stop.Stopper
  • func (tc *TestCluster) Target(serverIdx int) ReplicationTarget
  • func (tc *TestCluster) TransferRangeLease(rangeDesc *roachpb.RangeDescriptor, dest ReplicationTarget) error
  • func (tc *TestCluster) WaitForFullReplication() error

Variables

var TestClusterFactory serverutils.TestClusterFactory = testClusterFactoryImpl{}

TestClusterFactory can be passed to serverutils.InitTestClusterFactory

Types

type ReplicationTarget

type ReplicationTarget struct {
	NodeID  roachpb.NodeID
	StoreID roachpb.StoreID
}

ReplicationTarget identifies a node/store pair.

type TestCluster

type TestCluster struct {
	Servers []*server.TestServer
	Conns   []*gosql.DB
	// contains filtered or unexported fields
}

TestCluster represents a set of TestServers. The hope is that it can be used analoguous to TestServer, but with control over range replication.

func StartTestCluster

func StartTestCluster(t testing.TB, nodes int, args base.TestClusterArgs) *TestCluster

StartTestCluster starts up a TestCluster made up of `nodes` in-memory testing servers. The cluster should be stopped using cluster.Stop().

func (*TestCluster) AddReplicas

func (tc *TestCluster) AddReplicas(
	startKey roachpb.Key, targets ...ReplicationTarget,
) (*roachpb.RangeDescriptor, error)

AddReplicas adds replicas for a range on a set of stores. It's illegal to have multiple replicas of the same range on stores of a single node. The method blocks until a snapshot of the range has been copied to all the new replicas and the new replicas become part of the Raft group.

func (*TestCluster) FindRangeLeaseHolder

func (tc *TestCluster) FindRangeLeaseHolder(
	rangeDesc *roachpb.RangeDescriptor,
	hint *ReplicationTarget,
) (ReplicationTarget, error)

FindRangeLeaseHolder returns the current lease holder for the given range. In particular, it returns one particular node's (the hint, if specified) view of the current lease. An error is returned if there's no active lease.

Note that not all nodes have necessarily applied the latest lease, particularly immediately after a TransferRangeLease() call. So specifying different hints can yield different results. The one server that's guaranteed to have applied the transfer is the previous lease holder.

func (*TestCluster) LookupRange

func (tc *TestCluster) LookupRange(key roachpb.Key) (roachpb.RangeDescriptor, error)

LookupRange returns the descriptor of the range containing key.

func (*TestCluster) NumServers

func (tc *TestCluster) NumServers() int

NumServers is part of TestClusterInterface.

func (*TestCluster) RemoveReplicas

func (tc *TestCluster) RemoveReplicas(
	startKey roachpb.Key, targets ...ReplicationTarget,
) (*roachpb.RangeDescriptor, error)

RemoveReplicas removes one or more replicas from a range.

func (*TestCluster) Server

func (tc *TestCluster) Server(idx int) serverutils.TestServerInterface

Server is part of TestClusterInterface.

func (*TestCluster) ServerConn

func (tc *TestCluster) ServerConn(idx int) *gosql.DB

ServerConn is part of TestClusterInterface.

func (*TestCluster) SplitRange

func (tc *TestCluster) SplitRange(
	splitKey roachpb.Key,
) (*roachpb.RangeDescriptor, *roachpb.RangeDescriptor, error)

SplitRange splits the range containing splitKey. The right range created by the split starts at the split key and extends to the original range's end key. Returns the new descriptors of the left and right ranges.

splitKey must correspond to a SQL table key (it must end with a family ID / col ID).

func (*TestCluster) StopServer

func (tc *TestCluster) StopServer(idx int)

StopServer stops an individual server in the cluster.

func (*TestCluster) Stopper

func (tc *TestCluster) Stopper() *stop.Stopper

Stopper returns the stopper for this testcluster.

func (*TestCluster) Target

func (tc *TestCluster) Target(serverIdx int) ReplicationTarget

Target returns a ReplicationTarget for the specified server.

func (*TestCluster) TransferRangeLease

func (tc *TestCluster) TransferRangeLease(
	rangeDesc *roachpb.RangeDescriptor, dest ReplicationTarget,
) error

TransferRangeLease transfers the lease for a range from whoever has it to a particular store. That store must already have a replica of the range. If that replica already has the (active) lease, this method is a no-op.

When this method returns, it's guaranteed that the old lease holder has applied the new lease, but that's about it. It's not guaranteed that the new lease holder has applied it (so it might not know immediately that it is the new lease holder).

func (*TestCluster) WaitForFullReplication

func (tc *TestCluster) WaitForFullReplication() error

WaitForFullReplication waits until all stores in the cluster have no ranges with replication pending.