kafka topic

Kafka is designed for the distributed environment, so if the log file can actually be understood as a message database, put in the same place, then will inevitably bring a decline in availability, a hang all, if the full amount of copies to all machines, then there is too much redundancy of data, and because each machine's disk size is limited , so even if there are more machines, the messages that can be processed are limited by the disk and cannot e

some time ago in the Kafka QQ Group was asked about this--about how Java consumer dynamically modify topic subscription issues. It's really a good question to think about it, because if you simply hold the consumer instance in another thread and then call subscribe to modify it, the consumer side will inevitably throw an exception Concurrentmodificationexception:kafkaconsumer is isn'tsafe for multi-threade

;ImportKafka.admin.RackAwareMode;Importkafka.utils.ZkUtils; Public classKafkautil { Public Static voidcreatekafatopic (String zkstr,kafkatopicbean topic) {zkutils zkutils=zkutils. Apply (ZKSTR,30000, 30000, jaasutils.iszksecurityenabled ()); Adminutils.createtopic (Zkutils, Topic.gettopicname (), Topic.getpartition (), Topic.getreplication (), NewProperties (),Newrackawaremode.enforced$ ()); Zkutils.close (); } Public Static voiddeletekaf

1. Use the command line method: [lch@linux129 bin]$./kafka-topics.sh--create--zookeeper hadoop221:2181,hadoop222:2181--replication-factor 2-- Partitions 2--topic test_ttt parameter description:--replication-factor: Indicates the number of copies, written here 2, indicating there will be two copies--partitions: indicates there will be two par Tition, shown in log logs, is two foldersThis is the test_ttt-0 an

Hu Xi, "Apache Kafka actual Combat" author, Beihang University Master of Computer Science, is currently a mutual gold company computing platform director, has worked in IBM, Sogou, Weibo and other companies. Domestic active Kafka code contributor.ObjectiveAlthough Apache Kafka is now fully evolved into a streaming processing platform, most users still use their c

close this cmd command line interface, because close it, the Kafka process is stopped. 5. Create Topic Command: Kafka-run-class.bat kafka.admin.TopicCommand--create--zookeeper localhost:2181--replication-factor 1-- Partitions 1--topic hellotestThis command creates a topic n

Learning questions: Does 1.kafka need zookeeper?What is 2.kafka?What concepts does 3.kafka contain?4. How do I simulate a client sending and receiving a message preliminary test? (Kafka installation steps)5.kafka cluster How to interact with zookeeper? 1.

number of message streams to return. number of streams to be returned * @ param keyDecoder a decoder that decodes the message key can be decoded Key decoder * @ param valueDecoder a decoder that decodes the message itself can decode the decoder of the message itself * @ return a list of KafkaStream. each stream supports an * iterator over its MessageAndMetadata elements. returns the KafkaStream list. Each stream supports an iterator Based on the MessagesAndMetadata element. */ public /*** Cre

Refer to the message system, currently the hottest Kafka, the company also intends to use Kafka for the unified collection of business logs, here combined with their own practice to share the specific configuration and use. Kafka version 0.10.0.1 Update record 2016.08.15: Introduction to First draft As a suite of large data for cloud computing,

"original statement" This article belongs to the author original, has authorized Infoq Chinese station first, reproduced please must be marked at the beginning of the article from "Jason's Blog", and attached the original link http://www.jasongj.com/2015/06/08/KafkaColumn3/SummaryIn this paper, based on the previous article, the HA mechanism of Kafka is explained in detail, and various ha related scenarios such as broker Failover,controller Failover,

partition.View the metrics of the entire cluster through Kafka ManagerKafka Manager is an open source Kafka management tool for Yahoo. It supports the following functions Managing multiple clusters Easy view of cluster status Execute preferred replica election Bulk build and execute partition allocation scheme for multiple topic Create

tool for Yahoo. It supports the following functions Manage multiple clusters easy to view cluster status Execute preferred replica election Bulk build and execute partition allocation scheme for multiple topic Create topic Delete topic (supports only 0.8.2 and above, and requires delete.topic.enable set to True" Add

in which messages are sent, a topic can have multiple partitions, the number of specific partitions is configurable. The meaning of partitioning is significant, and the content behind it is gradually reflected. Offline data loading: Kafka It is also ideal for data loading into Hadoop or data warehouses due to support for extensible data persistence. Plugin support: Now a lot of activeCommunity has develope

SummaryIn this paper, based on the previous article, the HA mechanism of Kafka is explained in detail, and various ha related scenarios such as broker Failover,controller Failover,topic creation/deletion, broker initiating, Follower a detailed process from leader fetch data. It also introduces the replication related tools provided by Kafka, such as redistributio

:2182,127.0.0.1:2183 Modify server2.properties as follows: broker.id=2listeners=PLAINTEXT://127.0.0.1:9094port=9094host.name=127.0.0.1log.dirs=/opt/kafka/kafkalogs2zookeeper.connect=127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183Start the Kafka cluster and Test 1. Start the service # Start the Kafka cluster from the background (three need to be started) # enter the

] -> PartitionFetchInfo(0,1048576),[test-topic05-srt,22] -> PartitionFetchInfo(33136074,1048576),[test-topic01-sd,1] -> PartitionFetchInfo(14361,1048576),[test-topic03-rd,21] -> PartitionFetchInfo(96366,1048576),[test-topic04-ursd,10] -> PartitionFetchInfo(0,1048576),[my-working-topic,15] -> PartitionFetchInfo(0,1048576),[test-topic02-ts_st,12] -> PartitionFetchInfo(0,1048576),[test-topic03-ursr,9] -> PartitionFetchInfo(1,1048576) (kafka.server.KafkaA

distribute all replica evenly across the entire clusterFor better load balancing, Kafka distributes all partition evenly across the cluster as much as possible. A typical deployment is a topic partition number that is larger than the number of brokers. At the same time, in order to improve the fault tolerance of Kafka, we also need to spread the same partition r

to buy all kinds of stockings. Of course, there are some business data, if the storage database waste, and directly with the traditional storage drive is inefficient, this time, you can also use Kafka distributed to store.3. Related Concepts in Kafka· BrokerThe Kafka cluster contains one or more servers, which are called broker. A

] # bin/kafka-server-start.sh config/server. important Properties in the properties broker configuration file: # broker ID. the ID of each broker must be unique. broker. id = 0 # Directory for storing logs Log. dir =/tmp/kafka8-logs # Zookeeper connection string Zookeeper. connect = localhost: 21813. create a topic [[email protected] kafka-0.8] # bin/

, built-in partitioning, redundancy, and fault tolerance, which makes Kafka a good solution for large-scale message processing applications. Generally, the throughput of a message system is relatively low, but it requires less end-to-end latency. It depends on the powerful durability guaranteed by Kafka. In this field, Kafka is comparable to traditional messaging