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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3311) Add a connector for streaming data into Cassandra
Date Tue, 05 Apr 2016 15:43:25 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15226486#comment-15226486

ASF GitHub Bot commented on FLINK-3311:

Github user rmetzger commented on a diff in the pull request:

    --- Diff: flink-streaming-connectors/flink-connector-cassandra/src/test/java/org/apache/flink/batch/connectors/cassandra/example/BatchExample.java
    @@ -0,0 +1,71 @@
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *    http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.flink.batch.connectors.cassandra.example;
    +import com.datastax.driver.core.Cluster;
    +import com.datastax.driver.core.Cluster.Builder;
    +import org.apache.flink.api.common.typeinfo.TypeHint;
    +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.api.java.typeutils.TupleTypeInfo;
    +import org.apache.flink.batch.connectors.cassandra.CassandraInputFormat;
    +import org.apache.flink.batch.connectors.cassandra.CassandraOutputFormat;
    +import org.apache.flink.streaming.connectors.cassandra.ClusterBuilder;
    +import java.util.ArrayList;
    +public class BatchExample {
    +	private static final String INSERT_QUERY = "INSERT INTO test.batches (number, strings)
VALUES (?,?);";
    +	private static final String SELECT_QUERY = "SELECT number, strings FROM test.batches;";
    +	/*
    +	 *	table script: "CREATE TABLE test.batches (number int, strings text, PRIMARY KEY(number,
    +	 */
    --- End diff --
    I would remove this comment and move the query to the class javadocs.

> Add a connector for streaming data into Cassandra
> -------------------------------------------------
>                 Key: FLINK-3311
>                 URL: https://issues.apache.org/jira/browse/FLINK-3311
>             Project: Flink
>          Issue Type: New Feature
>          Components: Streaming Connectors
>            Reporter: Robert Metzger
>            Assignee: Andrea Sella
> We had users in the past asking for a Flink+Cassandra integration.
> It seems that there is a well-developed java client for connecting into Cassandra: https://github.com/datastax/java-driver
(ASL 2.0)
> There are also tutorials out there on how to start a local cassandra instance (for the
tests): http://prettyprint.me/prettyprint.me/2010/02/14/running-cassandra-as-an-embedded-service/index.html
> For the data types, I think we should support TupleX types, and map standard java types
to the respective cassandra types.
> In addition, it seems that there is a object mapper from datastax to store POJOs in Cassandra
(there are annotations for defining the primary key and types)

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