org.apache.cassandra.db.view

Class MaterializedViewUtils

java.lang.Object

org.apache.cassandra.db.view.MaterializedViewUtils

public final class MaterializedViewUtils
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static java.net.InetAddress	getViewNaturalEndpoint(java.lang.String keyspaceName, Token baseToken, Token viewToken) Calculate the natural endpoint for the view.

Methods inherited from class java.lang.Object

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

Method Detail

getViewNaturalEndpoint

public static java.net.InetAddress getViewNaturalEndpoint(java.lang.String keyspaceName,
                                                          Token baseToken,
                                                          Token viewToken)

Calculate the natural endpoint for the view. The view natural endpoint is the endpint which has the same cardinality as this node in the replication factor. The cardinality is the number at which this node would store a piece of data, given the change in replication factor. For example, if we have the following ring: A, T1 -> B, T2 -> C, T3 -> A For the token T1, at RF=1, A would be included, so A's cardinality for T1 is 1. For the token T1, at RF=2, B would be included, so B's cardinality for token T1 is 2. For token T3, at RF = 2, A would be included, so A's cardinality for T3 is 2. For a view whose base token is T1 and whose view token is T3, the pairings between the nodes would be: A writes to C (A's cardinality is 1 for T1, and C's cardinality is 1 for T3) B writes to A (B's cardinality is 2 for T1, and A's cardinality is 2 for T3) C writes to B (C's cardinality is 3 for T1, and B's cardinality is 3 for T3)

Throws:

java.lang.RuntimeException - if this method is called using a base token which does not belong to this replica