JDBC Integration 
The kamon-jdbc module brings bytecode instrumentation to trace jdbc-compatible database requests
The kamon-jdbc module requires you to start your application using the Kamon Agent. Kamon will warn you
at startup if you failed to do so.
The bytecode instrumentation provided by the kamon-jdbc module hooks into the JDBC API to automatically
start and finish segments for requests that are issued within a trace. This translates into you having metrics about how
the requests you are doing are behaving.
Getting Started
Kamon scala module is currently available for Scala 2.10, 2.11 and 2.12.
Supported releases and dependencies are shown below., kamon-jdbc, status, jdk, scala, :------:, :------:, :----:, ------------------, 1.0.0-RC1, experimental, 1.8+, 2.10, 2.11, 2.12
To get started with SBT, simply add the following to your build.sbt
file:
libraryDependencies += "io.kamon" %% "kamon-jdbc" % "experimental-1.0.0-RC1"
Metrics
The following metrics will be recorded:
- reads: a histogram that tracks the reads requests latency (SELECT statement).
- writes: a histogram that tracks the writes requests latency (INSERT, UPDATE, and DELETE statements).
- slows: a simple counter with the number of measured slow requests.
- errors: a simple counter with the number of failures.
Naming Segments
By default, the name generator bundled with the kamon-jdbc module will use the statement name as tge name to the automatically generated segment (i.e SELECT, INSERT, etc). Currently, the only way to override that name would be to provide your own implementation of kamon.jdbc.JdbcNameGenerator which is used to assign the segment name
Slow Requests
Requests that take longer to execute than the configured kamon.jdbc.slow-query-threshold can be processed by user-defined
kamon.jdbc.DefaultSlowQueryProcessor. The default processor logs a warning message
Error Processor
Requests that error can be processed by user-defined kamon.jdbc.SqlErrorProcessor. The default processor logs an error message
Configuration
kamon {
jdbc {
slow-query-threshold = 2 seconds
# Fully qualified name of the implementation of kamon.jdbc.SlowQueryProcessor.
slow-query-processor = kamon.jdbc.DefaultSlowQueryProcessor
# Fully qualified name of the implementation of kamon.jdbc.SqlErrorProcessor.
sql-error-processor = kamon.jdbc.DefaultSqlErrorProcessor
# Fully qualified name of the implementation of kamon.jdbc.JdbcNameGenerator that will be used for assigning names to segments.
name-generator = kamon.jdbc.DefaultJdbcNameGenerator
}
}