[ 
https://issues.apache.org/jira/browse/RYA-443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373332#comment-16373332
 ] 

ASF GitHub Bot commented on RYA-443:
------------------------------------

Github user ejwhite922 commented on a diff in the pull request:

    https://github.com/apache/incubator-rya/pull/272#discussion_r170073123
  
    --- Diff: 
extras/rya.streams/query-manager/src/main/java/org/apache/rya/streams/querymanager/kafka/KafkaQueryChangeLogSource.java
 ---
    @@ -0,0 +1,219 @@
    +/**
    + * 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.rya.streams.querymanager.kafka;
    +
    +import static java.util.Objects.requireNonNull;
    +
    +import java.util.HashMap;
    +import java.util.HashSet;
    +import java.util.Map.Entry;
    +import java.util.Properties;
    +import java.util.Set;
    +import java.util.UUID;
    +import java.util.concurrent.locks.ReentrantLock;
    +import java.util.stream.Collectors;
    +
    +import org.apache.kafka.clients.CommonClientConfigs;
    +import org.apache.kafka.clients.consumer.ConsumerConfig;
    +import org.apache.kafka.clients.consumer.KafkaConsumer;
    +import org.apache.kafka.common.serialization.StringDeserializer;
    +import org.apache.rya.streams.kafka.KafkaTopics;
    +import org.apache.rya.streams.kafka.queries.KafkaQueryChangeLog;
    +import org.apache.rya.streams.kafka.queries.KafkaQueryChangeLogFactory;
    +import org.apache.rya.streams.querymanager.QueryChangeLogSource;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import com.google.common.collect.Sets;
    +import com.google.common.util.concurrent.AbstractScheduledService;
    +
    +import edu.umd.cs.findbugs.annotations.DefaultAnnotation;
    +import edu.umd.cs.findbugs.annotations.NonNull;
    +
    +/**
    + * Represents a Kafka Server that manages {@link KafkaQueryChangeLog}s.
    + * <p/>
    + * Thread safe.
    --- End diff --
    
    net.jcip.annotations.ThreadSafe
    
    Looks like Rya is using this one:
    ```
            <dependency>
                <groupId>com.github.stephenc.jcip</groupId>
                <artifactId>jcip-annotations</artifactId>
                <version>1.0-1</version>
            </dependency>
    ```


> Implement a single node query manager
> -------------------------------------
>
>                 Key: RYA-443
>                 URL: https://issues.apache.org/jira/browse/RYA-443
>             Project: Rya
>          Issue Type: Task
>            Reporter: Andrew Smith
>            Assignee: Kevin Chilton
>            Priority: Major
>
> We need an application that watches the QueryChangeLog to see when the 
> isActive state of queries changes and then reacts to the state change. If 
> isActive goes to true, the system must start processing the query. If it is 
> false, then it must stop processing the query. This application needs to 
> start when the host machine starts. We plan to support CentOS 7.



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