Consume GCS files based on pattern from Flink

Question

Since Flink supports the Hadoop FileSystem abstraction, and there's a GCS connector - library that implements it on top of Google Cloud Storage.

How do I create a Flink file source using the code in this repo?

Answer 1

To achieve this you need to:

1. Install and configure GCS connector on your Flink cluster.
2. Add Hadoop and Flink dependencies (including HDFS connector) to your project:

   <dependency>
       <groupId>org.apache.flink</groupId>
       <artifactId>flink-scala_2.11</artifactId>
       <version>${flink.version}</version>
       <scope>provided</scope>
   </dependency>
   <dependency>
       <groupId>org.apache.flink</groupId>
       <artifactId>flink-connector-filesystem_2.11</artifactId>
       <version>${flink.version}</version>
   </dependency>
   <dependency>
       <groupId>org.apache.flink</groupId>
       <artifactId>flink-hadoop-compatibility_2.11</artifactId>
       <version>${flink.version}</version>
   </dependency>
   <dependency>
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-common</artifactId>
       <version>${hadoop.version}</version>
       <scope>provided</scope>
   </dependency>
   <dependency>
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-mapreduce-client-core</artifactId>
       <version>${hadoop.version}</version>
       <scope>provided</scope>
   </dependency>
   

3. Use it to create data source with GCS path:

   import org.apache.flink.api.java.DataSet;
   import org.apache.flink.api.java.ExecutionEnvironment;
   import org.apache.flink.api.java.tuple.Tuple2;
   import org.apache.flink.hadoopcompatibility.HadoopInputs;
   import org.apache.hadoop.io.LongWritable;
   import org.apache.hadoop.io.Text;
   import org.apache.hadoop.mapred.TextInputFormat;
   
   ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
   
   DataSet<Tuple2<LongWritable, Text>> input =
       env.createInput(
           HadoopInputs.readHadoopFile(
               new TextInputFormat(), LongWritable.class, Text.class, "gs://bucket/path/some*pattern/"));