Package org.apache.druid.server.coordinator.loading

Class SegmentHolder

java.lang.Object

org.apache.druid.server.coordinator.loading.SegmentHolder

All Implemented Interfaces:

Comparable<SegmentHolder>

public class SegmentHolder
extends Object
implements Comparable<SegmentHolder>

Represents a segment queued for a load or drop operation in a LoadQueuePeon.

Requests are naturally ordered using the COMPARE_ACTION_THEN_INTERVAL.

Field Summary

Fields

Modifier and Type	Field	Description
static final com.google.common.collect.Ordering<DataSegment>	NEWEST_SEGMENT_FIRST	Orders newest segments first (i.e.

Constructor Summary

Constructors

Constructor	Description
SegmentHolder(DataSegment segment, SegmentAction action, org.joda.time.Duration requestTimeout, LoadPeonCallback callback)

Method Summary

Modifier and Type	Method	Description
void	addCallback(LoadPeonCallback callback)
int	compareTo(SegmentHolder that)
boolean	equals(Object o)
SegmentAction	getAction()
List<LoadPeonCallback>	getCallbacks()	Returns an immutable copy of all non-null callbacks for this queued segment.
DataSegmentChangeRequest	getChangeRequest()
DataSegment	getSegment()
String	getSegmentIdentifier()
int	hashCode()
boolean	hasRequestTimedOut()	A request is considered to have timed out if the time elapsed since it was first sent to the server is greater than the configured load timeout.
int	incrementAndGetRunsInQueue()
boolean	isLoad()
void	markRequestSentToServer()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

NEWEST_SEGMENT_FIRST

public static final com.google.common.collect.Ordering<DataSegment> NEWEST_SEGMENT_FIRST

Orders newest segments first (i.e. segments with most recent intervals).

The order is needed to ensure that:

• Round-robin assignment distributes segments belonging to same or adjacent intervals uniformly across all servers.
• Load queue prioritizes load of most recent segments, as they are presumed to contain more important data which is queried more often.
• Replication throttler has a smaller impact on replicas of newer segments.

Constructor Details

SegmentHolder

public SegmentHolder(DataSegment segment,
 SegmentAction action,
 org.joda.time.Duration requestTimeout,
 @Nullable
 LoadPeonCallback callback)

Method Details

getSegment

public DataSegment getSegment()

getAction

public SegmentAction getAction()

isLoad

public boolean isLoad()

getChangeRequest

public DataSegmentChangeRequest getChangeRequest()

getSegmentIdentifier

public String getSegmentIdentifier()

addCallback

public void addCallback(@Nullable
 LoadPeonCallback callback)

getCallbacks

public List<LoadPeonCallback> getCallbacks()

Returns an immutable copy of all non-null callbacks for this queued segment.

markRequestSentToServer

public void markRequestSentToServer()

hasRequestTimedOut

public boolean hasRequestTimedOut()

A request is considered to have timed out if the time elapsed since it was first sent to the server is greater than the configured load timeout.

See Also:

• HttpLoadQueuePeonConfig.getLoadTimeout()

incrementAndGetRunsInQueue

public int incrementAndGetRunsInQueue()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

compareTo

public int compareTo(SegmentHolder that)

Specified by:

compareTo in interface Comparable<SegmentHolder>

toString

public String toString()

Overrides:

toString in class Object