org.apache.druid.server.coordinator.loading

Class RoundRobinServerSelector

java.lang.Object

org.apache.druid.server.coordinator.loading.RoundRobinServerSelector

@NotThreadSafe
public class RoundRobinServerSelector
extends Object

Provides iterators over historicals for a given tier that can load a specified segment.

Once a selector is initialized with a DruidCluster, an iterator returned by getServersInTierToLoadSegment(String, DataSegment) iterates over the historicals in a tier in a round robin fashion. The next invocation of this method picks up where the last iterator had left off.

This class is not thread-safe and must be used from a single thread.

Constructor Summary

Constructors

Constructor and Description
RoundRobinServerSelector(DruidCluster cluster)

Method Summary

Modifier and Type	Method and Description
Iterator<ServerHolder>	getServersInTierToLoadSegment(String tier, DataSegment segment) Returns an iterator over the servers in this tier which are eligible to load the given segment.

Methods inherited from class java.lang.Object

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

Constructor Detail

RoundRobinServerSelector

public RoundRobinServerSelector(DruidCluster cluster)

Method Detail

getServersInTierToLoadSegment

public Iterator<ServerHolder> getServersInTierToLoadSegment(String tier,
                                                            DataSegment segment)

Returns an iterator over the servers in this tier which are eligible to load the given segment.