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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 15:13:25 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15226428#comment-15226428
] 

ASF GitHub Bot commented on FLINK-3311:
---------------------------------------

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

    https://github.com/apache/flink/pull/1771#discussion_r58556061
  
    --- Diff: flink-streaming-connectors/flink-connector-cassandra/src/main/java/org/apache/flink/streaming/connectors/cassandra/CassandraSink.java
---
    @@ -0,0 +1,313 @@
    +/**
    + * 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
    + * <p/>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p/>
    + * 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.streaming.connectors.cassandra;
    +
    +import com.datastax.driver.core.Cluster;
    +import org.apache.flink.api.common.typeinfo.TypeInformation;
    +import org.apache.flink.api.common.typeutils.TypeSerializer;
    +import org.apache.flink.api.java.tuple.Tuple;
    +import org.apache.flink.api.java.typeutils.TupleTypeInfo;
    +import org.apache.flink.streaming.api.datastream.DataStream;
    +import org.apache.flink.streaming.api.datastream.DataStreamSink;
    +import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
    +import org.apache.flink.streaming.api.operators.ChainingStrategy;
    +import org.apache.flink.streaming.api.transformations.SinkTransformation;
    +import org.apache.flink.streaming.api.transformations.StreamTransformation;
    +import org.apache.flink.streaming.runtime.operators.CheckpointCommitter;
    +
    +import java.util.UUID;
    +
    +/**
    + * This class wraps different Cassandra sink implementations to provide a common interface
for all of them.
    + *
    + * @param <IN> input type
    + */
    +public class CassandraSink<IN> {
    +	private static final String jobID = UUID.randomUUID().toString().replace("-", "_");
    --- End diff --
    
    `jobID` is used within Flink a lot and has a different meaning there. Maybe it make sense
to rename this to "sink id".
    
    Why is this field static? This can lead to problems when a user is using two cassandra
sinks


> 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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