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https://issues.apache.org/jira/browse/TAJO-1480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14459557#comment-14459557
]
ASF GitHub Bot commented on TAJO-1480:
--------------------------------------
Github user blrunner commented on a diff in the pull request:
https://github.com/apache/tajo/pull/482#discussion_r27782794
--- Diff:
tajo-storage/tajo-storage-kafka/src/main/java/org/apache/tajo/storage/kafka/SimpleConsumerManager.java
---
@@ -0,0 +1,314 @@
+/**
+ * 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.tajo.storage.kafka;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+import java.util.Set;
+
+import kafka.api.FetchRequest;
+import kafka.api.FetchRequestBuilder;
+import kafka.api.PartitionOffsetRequestInfo;
+import kafka.cluster.Broker;
+import kafka.common.ErrorMapping;
+import kafka.common.TopicAndPartition;
+import kafka.javaapi.FetchResponse;
+import kafka.javaapi.OffsetResponse;
+import kafka.javaapi.PartitionMetadata;
+import kafka.javaapi.TopicMetadata;
+import kafka.javaapi.TopicMetadataRequest;
+import kafka.javaapi.consumer.SimpleConsumer;
+import kafka.message.MessageAndOffset;
+
+import org.apache.commons.collections.IteratorUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.tajo.util.NetUtils;
+
+// SimpleConsumerManager is kafka client for KafkaScanner.
+// It's one per partition. Each partition instantiate this class.
+public class SimpleConsumerManager {
+ private static final Log LOG =
LogFactory.getLog(SimpleConsumerManager.class);
+ // TODO: configurable setting.
+ static final int CONSUMER_TIMEOUT = 30000;
+ static final int CONSUMER_BUFFER_SIZE = 64 * 1024;
+ static final int CONSUMER_FETCH_SIZE = 300 * 1024;
+ static final int FETCH_TRY_NUM = 3;
--- End diff --
How about separate configurable setting to interface? For example, the name
of interface will be KafkaProperties.
> Kafka Consumer for kafka strage.
> --------------------------------
>
> Key: TAJO-1480
> URL: https://issues.apache.org/jira/browse/TAJO-1480
> Project: Tajo
> Issue Type: Sub-task
> Components: storage
> Reporter: YeonSu Han
> Assignee: YeonSu Han
> Labels: kafka_storage
>
> Scanner of kafka storage needs to implement a Kafka Consumer for to fetch
> data from kafka.
> The Kafka Consumer have methods like this,
> - getPartitions(): Get partition id list from specific topic.
> - fetch(): Fetch data from kafka.
> - getReadOffset(): Get offset from specific partition.
> - findLeader(): Find leader broker of specific partition.
> - etc..
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