How do I use it about opentsdb-rpc-kafka HOT 1 OPEN

There are detailed instructions in the README.

The code here needs to be compiled and the resulting JAR put into OpenTSDB's plugin directory (as defined in tsd.core.plugin_path in the OpenTSDB config). Then, you will need to add the configuration items described here to the same (OpenTSDB's) config file. OpenTSDB will load the plugin on startup and spin up Kakfa consumers that consume the topic you configured.

The crucial part is the deserialiser class. Each message (i.e. the raw bytes) from the Kafka topic is passed to the deserialiser configured for that topic. A JSON deserialiser is provided out of the box, but you can also make your own by implementing the net.opentsdb.data.deserializers.Deserializer interface in case you have something other than JSON (Protobuf, for example) in your Kafka topic.

The deserialiser only needs to return a List of TypedIncomingData (which can be Metric, Aggregate, Histogram, or Metrics) for each message. The plugin takes care of the rest.

from opentsdb-rpc-kafka.