Examples of org.apache.hadoop.hbase.client.Connection

org.apache.hadoop.hbase.client.Connection

A cluster connection encapsulating lower level individual connections to actual servers and a connection to zookeeper. Connections are instantiated through the {@link ConnectionFactory}class. The lifecycle of the connection is managed by the caller, who has to {@link #close()}the connection to release the resources.

The connection object contains logic to find the master, locate regions out on the cluster, keeps a cache of locations and then knows how to re-calibrate after they move. The individual connections to servers, meta cache, zookeeper connection, etc are all shared by the {@link Table} and {@link Admin} instances obtained from this connection.

Connection creation is a heavy-weight operation. Connection implementations are thread-safe, so that the client can create a connection once, and share it with different threads. {@link Table} and {@link Admin} instances, on the other hand, are light-weight and are notthread-safe. Typically, a single connection per client application is instantiated and every thread will obtain its own Table instance. Caching or pooling of {@link Table} and {@link Admin}is not recommended.

This class replaces {@link HConnection}, which is now deprecated. @see ConnectionFactory

      };


      ObjectMapper mapper = new ObjectMapper();
      TestOptions opts = mapper.readValue(value.toString(), TestOptions.class);
      Configuration conf = HBaseConfiguration.create(context.getConfiguration());
      final Connection con = ConnectionFactory.createConnection(conf);


      // Evaluation task
      RunResult result = PerformanceEvaluation.runOneClient(this.cmd, conf, con, opts, status);
      // Collect how much time the thing took. Report as map output and
      // to the ELAPSED_TIME counter.

Examples of org.apache.hadoop.hbase.client.Connection

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