Merge pull request #9 from gouzouni625/LAM-23

LAM-23 Consumer to read data from Kafka and store them to HDFS.

example/kafka-batch-input-consumer.sh

+#!/bin/bash
+
+# Get the messages from Kafka and store them to a temporary file.
+/usr/local/kafka/bin/kafka-console-consumer.sh --consumer.config /usr/local/kafka/config/consumer-batch.properties --zookeeper localhost:2181 --topic input > temporary_input;
+
+timestamp=$(date +"%F_%H_%M_%S");
+
+# The last 12 lines of the file are created from the timeout exception thrown by the
+# kafka-console-consumer.sh script and they should be removed.
+head -n -12 temporary_input > temporary_input2;
+
+# Store the final file on HDFS.
+$(/usr/local/hadoop/bin/hdfs dfs -put temporary_input2 /user/root/input/tweets_$timestamp);
+
+# Remove all temporary files.
+rm temporary_input;
+rm temporary_input2;

usr/local/kafka/config/consumer-batch.properties

+# 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.
+# see kafka.consumer.ConsumerConfig for more details
+
+# Zookeeper connection string
+# comma separated host:port pairs, each corresponding to a zk
+# server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002"
+zookeeper.connect=127.0.0.1:2181
+
+# timeout in ms for connecting to zookeeper
+zookeeper.connection.timeout.ms=6000
+
+#consumer group id
+group.id=consumer-batch
+
+#consumer timeout
+consumer.timeout.ms=5000