org.apache.cassandra.service

Class RangeRelocator

java.lang.Object

org.apache.cassandra.service.RangeRelocator

public class RangeRelocator
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
RangeRelocator()

Method Summary

Modifier and Type	Method and Description
static RangesByEndpoint	calculateRangesToStreamWithEndpoints(RangesAtEndpoint streamRanges, AbstractReplicationStrategy strat, TokenMetadata tmdBefore, TokenMetadata tmdAfter) calculating endpoints to stream current ranges to if needed in some situations node will handle current ranges as part of the new ranges
static Pair<RangesAtEndpoint,RangesAtEndpoint>	calculateStreamAndFetchRanges(RangesAtEndpoint currentRanges, RangesAtEndpoint updatedRanges) Calculate pair of ranges to stream/fetch for given two range collections (current ranges for keyspace and ranges after move to new token) With transient replication the added wrinkle is that if a range transitions from full to transient then we need to stream the range despite the fact that we are retaining it as transient.
void	calculateToFromStreams()
java.util.concurrent.Future<StreamState>	stream()
boolean	streamsNeeded()

Methods inherited from class java.lang.Object

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

Constructor Detail

RangeRelocator

public RangeRelocator()

Method Detail

calculateRangesToStreamWithEndpoints

public static RangesByEndpoint calculateRangesToStreamWithEndpoints(RangesAtEndpoint streamRanges,
                                                                    AbstractReplicationStrategy strat,
                                                                    TokenMetadata tmdBefore,
                                                                    TokenMetadata tmdAfter)

calculating endpoints to stream current ranges to if needed in some situations node will handle current ranges as part of the new ranges

calculateToFromStreams

public void calculateToFromStreams()

calculateStreamAndFetchRanges

public static Pair<RangesAtEndpoint,RangesAtEndpoint> calculateStreamAndFetchRanges(RangesAtEndpoint currentRanges,
                                                                                    RangesAtEndpoint updatedRanges)

Calculate pair of ranges to stream/fetch for given two range collections (current ranges for keyspace and ranges after move to new token) With transient replication the added wrinkle is that if a range transitions from full to transient then we need to stream the range despite the fact that we are retaining it as transient. Some replica somewhere needs to transition from transient to full and we will be the source. If the range is transient and is transitioning to full then always fetch even if the range was already transient since a transiently replicated obviously needs to fetch data to become full. This why there is a continue after checking for instersection because intersection is not sufficient reason to do the subtraction since we might need to stream/fetch data anyways.

Parameters:

currentRanges - collection of the ranges by current token

updatedRanges - collection of the ranges after token is changed

Returns:

pair of ranges to stream/fetch for given current and updated range collections

stream

public java.util.concurrent.Future<StreamState> stream()

streamsNeeded

public boolean streamsNeeded()