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From tzulitai <...@git.apache.org>
Subject [GitHub] flink pull request #2131: [FLINK-3231][streaming-connectors] FlinkKinesisCon...
Date Mon, 27 Jun 2016 13:48:27 GMT
Github user tzulitai commented on a diff in the pull request:

    --- Diff: flink-streaming-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/ShardDiscoverer.java
    @@ -0,0 +1,215 @@
    + * 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.streaming.connectors.kinesis.internals;
    +import org.apache.flink.streaming.connectors.kinesis.model.KinesisStreamShard;
    +import org.apache.flink.streaming.connectors.kinesis.model.KinesisStreamShardState;
    +import org.apache.flink.streaming.connectors.kinesis.model.SentinelSequenceNumber;
    +import org.apache.flink.streaming.connectors.kinesis.proxy.GetShardListResult;
    +import org.apache.flink.streaming.connectors.kinesis.proxy.KinesisProxyInterface;
    +import org.apache.flink.streaming.connectors.kinesis.proxy.KinesisProxy;
    +import org.apache.flink.streaming.connectors.kinesis.util.KinesisConfigUtil;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +import java.util.HashMap;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Set;
    +import static org.apache.flink.util.Preconditions.checkNotNull;
    + * This runnable is in charge of discovering new shards that a fetcher should subscribe
    + * It is submitted to {@link KinesisDataFetcher#shardDiscovererAndSubscriberExecutor}
and continuously runs until the
    + * fetcher is closed. Whenever it discovers a new shard that should be subscribed to,
the shard is added to the
    + * {@link KinesisDataFetcher#pendingShards} queue with initial state, i.e. where in the
new shard we should start
    + * consuming from.
    + */
    +public class ShardDiscoverer<T> implements Runnable {
    --- End diff --
    You are right, this thread continuously polls Kinesis. I was worried about the delay it
would introduce, and how users would take the delay with it being a streaming source.
    But yes I agree it will be best to introduce configurable frequency, I was initially a
bit unsure of the continuous polling myself. We can add description about this delay of discovering
new shards after resharding in the consumer documentation.

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