org.apache.storm.kafka.spout

Enum FirstPollOffsetStrategy

java.lang.Object

java.lang.Enum<FirstPollOffsetStrategy>

org.apache.storm.kafka.spout.FirstPollOffsetStrategy

All Implemented Interfaces:

Serializable, Comparable<FirstPollOffsetStrategy>

public enum FirstPollOffsetStrategy
extends Enum<FirstPollOffsetStrategy>

Defines how the spout seeks the offset to be used in the first poll to Kafka upon topology deployment. By default this parameter is set to UNCOMMITTED_EARLIEST.

Enum Constant Summary

Enum Constants

Enum Constant and Description
EARLIEST The kafka spout polls records starting in the first offset of the partition, regardless of previous commits.
LATEST The kafka spout polls records starting at the end of the partition, regardless of previous commits.
UNCOMMITTED_EARLIEST The kafka spout polls records from the last committed offset, if any.
UNCOMMITTED_LATEST The kafka spout polls records from the last committed offset, if any.

Method Summary

Modifier and Type	Method and Description
static FirstPollOffsetStrategy	valueOf(String name) Returns the enum constant of this type with the specified name.
static FirstPollOffsetStrategy[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

EARLIEST

public static final FirstPollOffsetStrategy EARLIEST

The kafka spout polls records starting in the first offset of the partition, regardless of previous commits. This setting only takes effect on topology deployment

LATEST

public static final FirstPollOffsetStrategy LATEST

The kafka spout polls records starting at the end of the partition, regardless of previous commits. This setting only takes effect on topology deployment

UNCOMMITTED_EARLIEST

public static final FirstPollOffsetStrategy UNCOMMITTED_EARLIEST

The kafka spout polls records from the last committed offset, if any. If no offset has been committed it behaves as EARLIEST

UNCOMMITTED_LATEST

public static final FirstPollOffsetStrategy UNCOMMITTED_LATEST

The kafka spout polls records from the last committed offset, if any. If no offset has been committed it behaves as LATEST

Method Detail

values

public static FirstPollOffsetStrategy[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (FirstPollOffsetStrategy c : FirstPollOffsetStrategy.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static FirstPollOffsetStrategy valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null