java opentsdb client

Java OpenTSDB Client

1. Introduction

OpenTSDB is a distributed, scalable, and reliable time series database that is built on top of Apache HBase. It is designed to handle large amounts of time series data and provides powerful querying capabilities. In order to interact with OpenTSDB, we need a client library that can connect to the database and perform various operations. In this article, we will explore the Java OpenTSDB client library and learn how to use it to interact with OpenTSDB.

2. Setting up OpenTSDB

Before we can start using the Java OpenTSDB client, we need to have an instance of OpenTSDB running. Here are the steps to set up OpenTSDB:

1. Install Apache HBase: OpenTSDB uses Apache HBase as its underlying storage engine. Install and configure HBase according to its documentation.

2. Download and install OpenTSDB: Download the latest release of OpenTSDB from its official website and follow the installation instructions provided.

3. Start OpenTSDB: Start the OpenTSDB service by running the tsdb script. You may need to provide the path to the HBase configuration directory using the -c option.

Once OpenTSDB is up and running, we can proceed to the next section to learn how to use the Java OpenTSDB client.

3. Java OpenTSDB Client Library

The Java OpenTSDB client library provides a convenient way to interact with OpenTSDB from a Java application. It abstracts away the low-level details of the OpenTSDB API and provides a high-level interface for querying and writing data.

3.1. Maven Dependency

To use the Java OpenTSDB client library in your project, you need to add the following Maven dependency to your pom.xml file:

<dependency>
  <groupId>net.opentsdb</groupId>
  <artifactId>opentsdb-client</artifactId>
  <version>2.4.0</version>
</dependency>

3.2. Connecting to OpenTSDB

Before we can perform any operations on OpenTSDB, we need to establish a connection to the OpenTSDB server. Here is an example of how to create a connection:

import net.opentsdb.core.TSDB;
import net.opentsdb.core.WritableDataPoints;
import net.opentsdb.utils.Config;

public class OpenTSDBClientExample {
    public static void main(String[] args) {
        // Create a configuration object
        Config config = new Config(true);

        // Set the OpenTSDB server details
        config.overrideConfig("tsd.core.auto_create_metrics", "true");
        config.overrideConfig("tsd.storage.hbase.zk_quorum", "localhost");
        config.overrideConfig("tsd.network.port", "4242");

        // Create a TSDB instance
        TSDB tsdb = new TSDB(config);

        // Perform operations on OpenTSDB
        // ...
    }
}

In this example, we create a Config object and set the necessary properties to connect to the OpenTSDB server running on localhost with the default port 4242. We then create a TSDB instance using the configuration and use it to perform operations on OpenTSDB.

3.3. Writing Data to OpenTSDB

To write data to OpenTSDB, we need to create a WritableDataPoints object and add data points to it. Here is an example of how to write data to OpenTSDB:

import net.opentsdb.core.DataPoint;
import net.opentsdb.core.WritableDataPoints;

public class OpenTSDBClientExample {
    public static void main(String[] args) {
        // ...

        // Create a WritableDataPoints object
        WritableDataPoints dataPoints = tsdb.newDataPoints();

        // Add data points
        dataPoints.add(new DataPoint("metric1", System.currentTimeMillis(), 42));
        dataPoints.add(new DataPoint("metric2", System.currentTimeMillis(), 3.14));

        // Write data points to OpenTSDB
        dataPoints.write();

        // ...
    }
}

In this example, we create a WritableDataPoints object using the newDataPoints() method of the TSDB instance. We then add data points to it using the add() method, specifying the metric name, timestamp, and value. Finally, we call the write() method to write the data points to OpenTSDB.

3.4. Querying Data from OpenTSDB

To query data from OpenTSDB, we need to use the TSDB instance to create a query object and execute the query. Here is an example of how to query data from OpenTSDB:

import net.opentsdb.core.DataPoint;
import net.opentsdb.core.Query;
import net.opentsdb.core.QueryResult;

public class OpenTSDBClientExample {
    public static void main(String[] args) {
        // ...

        // Create a Query object
        Query query = tsdb.newQuery();

        // Set the query parameters
        query.setStart(System.currentTimeMillis() - 3600000); // 1 hour ago
        query.setEnd(System