在Flink中读取HBase数据可以通过Flink的Table API和Flink的DataStream API来实现。
使用Table API:
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connector-hbase_2.11</artifactId>
<version>${flink.version}</version>
</dependency>
TableConfig tableConfig = new TableConfig();
tableConfig.setConnector("hbase");
tableConfig.getConfiguration().put("connector.table-name", "your_hbase_table_name");
tableConfig.getConfiguration().put("connector.zookeeper.quorum", "zookeeper_host");
tableConfig.getConfiguration().put("connector.zookeeper.znode.parent", "/hbase");
tableConfig.getConfiguration().put("connector.write.buffer-flush.max-size", "1mb");
EnvironmentSettings settings = EnvironmentSettings.newInstance().useBlinkPlanner().inStreamingMode().build();
TableEnvironment tableEnv = TableEnvironment.create(settings);
tableEnv.getConfig().setTableConfig(tableConfig);
tableEnv.executeSql("CREATE TABLE hbase_table (\n" +
" rowkey STRING,\n" +
" cf1 ROW<col1 STRING, col2 INT>,\n" +
" cf2 ROW<col3 DOUBLE>\n" +
") WITH (\n" +
" 'connector' = 'hbase'\n" +
")");
Table result = tableEnv.sqlQuery("SELECT * FROM hbase_table");
tableEnv.toRetractStream(result, Row.class).print();
使用DataStream API:
final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
DeserializationSchema<Row> deserializer = new HBaseRowDeserializationSchema("your_hbase_table_name");
HBaseInputFormat hbaseInputFormat = new HBaseInputFormat("zookeeper_host", "your_hbase_table_name", new String[]{"cf1", "cf2"}, new TypeInformation[]{Types.STRING, Types.INT, Types.DOUBLE});
DataStream<Row> hbaseData = env.createInput(hbaseInputFormat, deserializer);
hbaseData.map(new MapFunction<Row, String>() {
@Override
public String map(Row value) throws Exception {
return value.toString();
}
}).print();
以上是通过Flink读取HBase数据的基本步骤,具体的操作可以根据实际需求进行调整和优化。