log (Sink)

This is a sink that can be used as a logger. This will log the output events in the output stream with user specified priority and a prefix

Syntax

CREATE SINK <NAME> WITH (type="log", map.type="<STRING>", priority="<STRING>", prefix="<STRING>")

Query Parameters

Name	Description	Default Value	Possible Data Types	Optional	Dynamic
priority	This will set the logger priority i.e log level. Accepted values are INFO, DEBUG, WARN, FATAL, ERROR, OFF, TRACE	INFO	STRING	Yes	No
prefix	This will be the prefix to the output message. If the output stream has event [2,4] and the prefix is given as "Hello" then the log will show "Hello : [2,4]"	default prefix will be :	STRING	Yes	No

Example 1

CREATE SINK BarStream WITH (type='log', prefix='My Log', priority='DEBUG') (symbol string, price float, volume long)

In this example BarStream uses log sink and the prefix is given as My Log. Also the priority is set to DEBUG.

Example 2

CREATE SINK BarStream WITH (type='log', priority='DEBUG') (symbol string, price float, volume long)

In this example BarStream uses log sink and the priority is set to DEBUG. User has not specified prefix so the default prefix will be in the form \<Stream App App Name> : \<Stream Name>

Example 3

CREATE SINK BarStream WITH (type='log', prefix='My Log') (symbol string, price float, volume long)

In this example BarStream uses log sink and the prefix is given as My Log. User has not given a priority so it will be set to default INFO.

Example 4

CREATE SINK BarStream WITH (type='log') (symbol string, price float, volume long)

In this example BarStream uses log sink. The user has not given prefix or priority so they will be set to their default values.