org.apache.cassandra.locator

Class TokenMetadata

java.lang.Object

org.apache.cassandra.locator.TokenMetadata

public class TokenMetadata
extends java.lang.Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TokenMetadata.Topology Tracks the assignment of racks and endpoints in each datacenter for all the "normal" endpoints in this TokenMetadata.

Field Summary

Fields

Modifier and Type	Field and Description
IPartitioner	partitioner

Constructor Summary

Constructors

Constructor and Description
TokenMetadata()

Method Summary

Modifier and Type	Method and Description
void	addBootstrapToken(Token token, java.net.InetAddress endpoint) Deprecated.
void	addBootstrapTokens(java.util.Collection<Token> tokens, java.net.InetAddress endpoint)
void	addLeavingEndpoint(java.net.InetAddress endpoint)
void	addMovingEndpoint(Token token, java.net.InetAddress endpoint) Add a new moving endpoint
void	addReplaceTokens(java.util.Collection<Token> replacingTokens, java.net.InetAddress newNode, java.net.InetAddress oldNode)
TokenMetadata	cachedOnlyTokenMap() Return a cached TokenMetadata with only tokenToEndpointMap, i.e., the same as cloneOnlyTokenMap but uses a cached copy that is invalided when the ring changes, so in the common case no extra locking is required.
void	calculatePendingRanges(AbstractReplicationStrategy strategy, java.lang.String keyspaceName) Calculate pending ranges according to bootsrapping and leaving nodes.
void	clearUnsafe() used by tests
TokenMetadata	cloneAfterAllLeft() Create a copy of TokenMetadata with tokenToEndpointMap reflecting situation after all current leave operations have finished.
TokenMetadata	cloneAfterAllSettled() Create a copy of TokenMetadata with tokenToEndpointMap reflecting situation after all current leave, and move operations have finished.
TokenMetadata	cloneOnlyTokenMap() Create a copy of TokenMetadata with only tokenToEndpointMap.
TokenMetadata	cloneWithNewPartitioner(IPartitioner newPartitioner) To be used by tests only (via StorageService.setPartitionerUnsafe(org.apache.cassandra.dht.IPartitioner)).
DecoratedKey	decorateKey(java.nio.ByteBuffer key)
static Token	firstToken(java.util.ArrayList<Token> ring, Token start)
static int	firstTokenIndex(java.util.ArrayList<Token> ring, Token start, boolean insertMin)
java.util.Set<java.net.InetAddress>	getAllEndpoints()
BiMultiValMap<Token,java.net.InetAddress>	getBootstrapTokens()
java.net.InetAddress	getEndpoint(Token token)
java.net.InetAddress	getEndpointForHostId(java.util.UUID hostId) Return the end-point for a unique host ID
java.util.Map<java.net.InetAddress,java.util.UUID>	getEndpointToHostIdMapForReading()
com.google.common.collect.Multimap<java.net.InetAddress,Token>	getEndpointToTokenMapForReading()
java.util.UUID	getHostId(java.net.InetAddress endpoint) Return the unique host ID for an end-point.
java.util.Set<java.net.InetAddress>	getLeavingEndpoints() caller should not modify leavingEndpoints
java.util.Set<Pair<Token,java.net.InetAddress>>	getMovingEndpoints() Endpoints which are migrating to the new tokens
java.util.Map<Token,java.net.InetAddress>	getNormalAndBootstrappingTokenToEndpointMap()
PendingRangeMaps	getPendingRanges(java.lang.String keyspaceName) a mutable map may be returned but caller should not modify it
java.util.List<Range<Token>>	getPendingRanges(java.lang.String keyspaceName, java.net.InetAddress endpoint)
com.google.common.collect.Multimap<Range<Token>,java.net.InetAddress>	getPendingRangesMM(java.lang.String keyspaceName)
Token	getPredecessor(Token token)
Range<Token>	getPrimaryRangeFor(Token right) Deprecated.
java.util.Collection<Range<Token>>	getPrimaryRangesFor(java.util.Collection<Token> tokens)
java.util.Optional<java.net.InetAddress>	getReplacementNode(java.net.InetAddress endpoint)
java.util.Optional<java.net.InetAddress>	getReplacingNode(java.net.InetAddress endpoint)
long	getRingVersion()
Token	getSuccessor(Token token)
Token	getToken(java.net.InetAddress endpoint) Deprecated.
java.util.Collection<Token>	getTokens(java.net.InetAddress endpoint)
TokenMetadata.Topology	getTopology()
java.util.Collection<java.net.InetAddress>	getWriteEndpoints(Token token, java.lang.String keyspaceName, java.util.Collection<java.net.InetAddress> naturalEndpoints) Deprecated. retained for benefit of old tests
void	invalidateCachedRings()
boolean	isLeaving(java.net.InetAddress endpoint)
boolean	isMember(java.net.InetAddress endpoint)
boolean	isMoving(java.net.InetAddress endpoint)
java.util.Collection<java.net.InetAddress>	pendingEndpointsFor(Token token, java.lang.String keyspaceName)
int	pendingRangeChanges(java.net.InetAddress source)
void	removeBootstrapTokens(java.util.Collection<Token> tokens)
void	removeEndpoint(java.net.InetAddress endpoint)
void	removeFromMoving(java.net.InetAddress endpoint) Remove pair of token/address from moving endpoints
static java.util.Iterator<Token>	ringIterator(java.util.ArrayList<Token> ring, Token start, boolean includeMin) iterator over the Tokens in the given ring, starting with the token for the node owning start (which does not have to be a Token in the ring)
java.util.ArrayList<Token>	sortedTokens()
java.lang.String	toString()
void	updateHostId(java.util.UUID hostId, java.net.InetAddress endpoint) Store an end-point to host ID mapping.
void	updateNormalToken(Token token, java.net.InetAddress endpoint) Update token map with a single token/endpoint pair in normal state.
void	updateNormalTokens(java.util.Collection<Token> tokens, java.net.InetAddress endpoint)
void	updateNormalTokens(com.google.common.collect.Multimap<java.net.InetAddress,Token> endpointTokens) Update token map with a set of token/endpoint pairs in normal state.
TokenMetadata.Topology	updateTopology() This is called when the snitch properties for many endpoints are updated, it will update the topology mappings of any endpoints whose snitch has changed, see CASSANDRA-10238.
TokenMetadata.Topology	updateTopology(java.net.InetAddress endpoint) This is called when the snitch properties for this endpoint are updated, see CASSANDRA-10238.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

partitioner

public final IPartitioner partitioner

Constructor Detail

TokenMetadata

public TokenMetadata()

Method Detail

cloneWithNewPartitioner

public TokenMetadata cloneWithNewPartitioner(IPartitioner newPartitioner)

To be used by tests only (via StorageService.setPartitionerUnsafe(org.apache.cassandra.dht.IPartitioner)).

pendingRangeChanges

public int pendingRangeChanges(java.net.InetAddress source)

Returns:

the number of nodes bootstrapping into source's primary range

updateNormalToken

public void updateNormalToken(Token token,
                              java.net.InetAddress endpoint)

Update token map with a single token/endpoint pair in normal state.

updateNormalTokens

public void updateNormalTokens(java.util.Collection<Token> tokens,
                               java.net.InetAddress endpoint)

updateNormalTokens

public void updateNormalTokens(com.google.common.collect.Multimap<java.net.InetAddress,Token> endpointTokens)

Update token map with a set of token/endpoint pairs in normal state. Prefer this whenever there are multiple pairs to update, as each update (whether a single or multiple) is expensive (CASSANDRA-3831).

updateHostId

public void updateHostId(java.util.UUID hostId,
                         java.net.InetAddress endpoint)

Store an end-point to host ID mapping. Each ID must be unique, and cannot be changed after the fact.

getHostId

public java.util.UUID getHostId(java.net.InetAddress endpoint)

Return the unique host ID for an end-point.

getEndpointForHostId

public java.net.InetAddress getEndpointForHostId(java.util.UUID hostId)

Return the end-point for a unique host ID

getEndpointToHostIdMapForReading

public java.util.Map<java.net.InetAddress,java.util.UUID> getEndpointToHostIdMapForReading()

Returns:

a copy of the endpoint-to-id map for read-only operations

addBootstrapToken

@Deprecated
public void addBootstrapToken(Token token,
                                          java.net.InetAddress endpoint)

Deprecated.

addBootstrapTokens

public void addBootstrapTokens(java.util.Collection<Token> tokens,
                               java.net.InetAddress endpoint)

addReplaceTokens

public void addReplaceTokens(java.util.Collection<Token> replacingTokens,
                             java.net.InetAddress newNode,
                             java.net.InetAddress oldNode)

getReplacementNode

public java.util.Optional<java.net.InetAddress> getReplacementNode(java.net.InetAddress endpoint)

getReplacingNode

public java.util.Optional<java.net.InetAddress> getReplacingNode(java.net.InetAddress endpoint)

removeBootstrapTokens

public void removeBootstrapTokens(java.util.Collection<Token> tokens)

addLeavingEndpoint

public void addLeavingEndpoint(java.net.InetAddress endpoint)

addMovingEndpoint

public void addMovingEndpoint(Token token,
                              java.net.InetAddress endpoint)

Add a new moving endpoint

Parameters:

token - token which is node moving to

endpoint - address of the moving node

removeEndpoint

public void removeEndpoint(java.net.InetAddress endpoint)

updateTopology

public TokenMetadata.Topology updateTopology(java.net.InetAddress endpoint)

This is called when the snitch properties for this endpoint are updated, see CASSANDRA-10238.

updateTopology

public TokenMetadata.Topology updateTopology()

This is called when the snitch properties for many endpoints are updated, it will update the topology mappings of any endpoints whose snitch has changed, see CASSANDRA-10238.

removeFromMoving

public void removeFromMoving(java.net.InetAddress endpoint)

Remove pair of token/address from moving endpoints

Parameters:

endpoint - address of the moving node

getTokens

public java.util.Collection<Token> getTokens(java.net.InetAddress endpoint)

getToken

@Deprecated
public Token getToken(java.net.InetAddress endpoint)

Deprecated.

isMember

public boolean isMember(java.net.InetAddress endpoint)

isLeaving

public boolean isLeaving(java.net.InetAddress endpoint)

isMoving

public boolean isMoving(java.net.InetAddress endpoint)

cloneOnlyTokenMap

public TokenMetadata cloneOnlyTokenMap()

Create a copy of TokenMetadata with only tokenToEndpointMap. That is, pending ranges, bootstrap tokens and leaving endpoints are not included in the copy.

cachedOnlyTokenMap

public TokenMetadata cachedOnlyTokenMap()

Return a cached TokenMetadata with only tokenToEndpointMap, i.e., the same as cloneOnlyTokenMap but uses a cached copy that is invalided when the ring changes, so in the common case no extra locking is required. Callers must *NOT* mutate the returned metadata object.

cloneAfterAllLeft

public TokenMetadata cloneAfterAllLeft()

Create a copy of TokenMetadata with tokenToEndpointMap reflecting situation after all current leave operations have finished.

Returns:

new token metadata

cloneAfterAllSettled

public TokenMetadata cloneAfterAllSettled()

Create a copy of TokenMetadata with tokenToEndpointMap reflecting situation after all current leave, and move operations have finished.

Returns:

new token metadata

getEndpoint

public java.net.InetAddress getEndpoint(Token token)

getPrimaryRangesFor

public java.util.Collection<Range<Token>> getPrimaryRangesFor(java.util.Collection<Token> tokens)

getPrimaryRangeFor

@Deprecated
public Range<Token> getPrimaryRangeFor(Token right)

Deprecated.

sortedTokens

public java.util.ArrayList<Token> sortedTokens()

getPendingRangesMM

public com.google.common.collect.Multimap<Range<Token>,java.net.InetAddress> getPendingRangesMM(java.lang.String keyspaceName)

getPendingRanges

public PendingRangeMaps getPendingRanges(java.lang.String keyspaceName)

a mutable map may be returned but caller should not modify it

getPendingRanges

public java.util.List<Range<Token>> getPendingRanges(java.lang.String keyspaceName,
                                                     java.net.InetAddress endpoint)

calculatePendingRanges

public void calculatePendingRanges(AbstractReplicationStrategy strategy,
                                   java.lang.String keyspaceName)

Calculate pending ranges according to bootsrapping and leaving nodes. Reasoning is: (1) When in doubt, it is better to write too much to a node than too little. That is, if there are multiple nodes moving, calculate the biggest ranges a node could have. Cleaning up unneeded data afterwards is better than missing writes during movement. (2) When a node leaves, ranges for other nodes can only grow (a node might get additional ranges, but it will not lose any of its current ranges as a result of a leave). Therefore we will first remove _all_ leaving tokens for the sake of calculation and then check what ranges would go where if all nodes are to leave. This way we get the biggest possible ranges with regard current leave operations, covering all subsets of possible final range values. (3) When a node bootstraps, ranges of other nodes can only get smaller. Without doing complex calculations to see if multiple bootstraps overlap, we simply base calculations on the same token ring used before (reflecting situation after all leave operations have completed). Bootstrapping nodes will be added and removed one by one to that metadata and checked what their ranges would be. This will give us the biggest possible ranges the node could have. It might be that other bootstraps make our actual final ranges smaller, but it does not matter as we can clean up the data afterwards. NOTE: This is heavy and ineffective operation. This will be done only once when a node changes state in the cluster, so it should be manageable.

getPredecessor

public Token getPredecessor(Token token)

getSuccessor

public Token getSuccessor(Token token)

getBootstrapTokens

public BiMultiValMap<Token,java.net.InetAddress> getBootstrapTokens()

Returns:

a copy of the bootstrapping tokens map

getAllEndpoints

public java.util.Set<java.net.InetAddress> getAllEndpoints()

getLeavingEndpoints

public java.util.Set<java.net.InetAddress> getLeavingEndpoints()

caller should not modify leavingEndpoints

getMovingEndpoints

public java.util.Set<Pair<Token,java.net.InetAddress>> getMovingEndpoints()

Endpoints which are migrating to the new tokens

Returns:

set of addresses of moving endpoints

firstTokenIndex

public static int firstTokenIndex(java.util.ArrayList<Token> ring,
                                  Token start,
                                  boolean insertMin)

firstToken

public static Token firstToken(java.util.ArrayList<Token> ring,
                               Token start)

ringIterator

public static java.util.Iterator<Token> ringIterator(java.util.ArrayList<Token> ring,
                                                     Token start,
                                                     boolean includeMin)

iterator over the Tokens in the given ring, starting with the token for the node owning start (which does not have to be a Token in the ring)

Parameters:

includeMin - True if the minimum token should be returned in the ring even if it has no owner.

clearUnsafe

public void clearUnsafe()

used by tests

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

pendingEndpointsFor

public java.util.Collection<java.net.InetAddress> pendingEndpointsFor(Token token,
                                                                      java.lang.String keyspaceName)

getWriteEndpoints

public java.util.Collection<java.net.InetAddress> getWriteEndpoints(Token token,
                                                                    java.lang.String keyspaceName,
                                                                    java.util.Collection<java.net.InetAddress> naturalEndpoints)

Deprecated. retained for benefit of old tests

getEndpointToTokenMapForReading

public com.google.common.collect.Multimap<java.net.InetAddress,Token> getEndpointToTokenMapForReading()

Returns:

an endpoint to token multimap representation of tokenToEndpointMap (a copy)

getNormalAndBootstrappingTokenToEndpointMap

public java.util.Map<Token,java.net.InetAddress> getNormalAndBootstrappingTokenToEndpointMap()

Returns:

a (stable copy, won't be modified) Token to Endpoint map for all the normal and bootstrapping nodes in the cluster.

getTopology

public TokenMetadata.Topology getTopology()

Returns:

the Topology map of nodes to DCs + Racks This is only allowed when a copy has been made of TokenMetadata, to avoid concurrent modifications when Topology methods are subsequently used by the caller.

getRingVersion

public long getRingVersion()

invalidateCachedRings

public void invalidateCachedRings()

decorateKey

public DecoratedKey decorateKey(java.nio.ByteBuffer key)