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From tillrohrmann <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-3332] Cassandra connector
Date Thu, 11 Feb 2016 16:12:48 GMT
Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1620#discussion_r52623292
  
    --- Diff: flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/GenericExactlyOnceSink.java
---
    @@ -0,0 +1,173 @@
    +/**
    + * 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.runtime.operators;
    +
    +import org.apache.flink.api.common.ExecutionConfig;
    +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.TypeExtractor;
    +import org.apache.flink.core.memory.DataInputView;
    +import org.apache.flink.runtime.state.AbstractStateBackend;
    +import org.apache.flink.runtime.state.StateHandle;
    +import org.apache.flink.streaming.api.operators.AbstractStreamOperator;
    +import org.apache.flink.streaming.api.operators.OneInputStreamOperator;
    +import org.apache.flink.streaming.api.watermark.Watermark;
    +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
    +import org.apache.flink.streaming.runtime.tasks.StreamTaskState;
    +
    +import java.io.IOException;
    +import java.io.Serializable;
    +import java.util.ArrayList;
    +import java.util.HashMap;
    +import java.util.HashSet;
    +import java.util.List;
    +import java.util.Set;
    +
    +/**
    + * Generic Sink that emits its input elements into an arbitrary backend. This sink is
integrated with the checkpointing
    + * mechanism to provide exactly once semantics.
    + *
    + * Incoming records are stored within a {@link org.apache.flink.runtime.state.AbstractStateBackend},
and only committed if a
    + * checkpoint is completed. Should a job fail while the data is being committed, no exactly
once guarantee can be made.
    + * @param <IN>
    + */
    +public abstract class GenericExactlyOnceSink<IN extends Tuple> extends AbstractStreamOperator<IN>
implements OneInputStreamOperator<IN, IN> {
    --- End diff --
    
    Can't the input type be a generic type?


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