Even in the latest Kafka version (0.9.0), the deletion command below isn't always working. Any suggestions from here? Sign in In Kafka, the word topic refers to a category or a common name used to store and publish a particular stream of data. $ docker exec broker-tutorial kafka-topics --delete --zookeeper zookeeper:2181 --topic blog-dummy Topic blog-dummy is marked for deletion. Requesting your assistance on the below : name=testusersUTC WQ== looks like a Base64 encoded value, which makes me suspect the ID field is being transported as a byte array (or at least, the Avro schema thinks it’s a byte array). poll.interval.ms = 50 However, upon restarting the Kafka Server, it STILL is trying to get a reference to old topics and trying to delete them, failing to rename them when deleting, and shutting down the broker because all the log dirs have failed. 1 answer. To enable it set the server config) delete.topic.enable=true Bug to track: KAFKA-1397 During debugging a problem with delete topic,I dig into Kafka code to know how delete command works, this the sequence of event occurred during command execution 1. tasks.max=2 key.converter=org.apache.kafka.connect.storage.StringConverter If the command succeeds, you see the following message: Created topic AWSKafkaTutorialTopic. If you want to delete all the topics created, Then Stop Kafka and zookeeper and delete data/log directories of both. Instead of the document getting updated in couchbase, a document is getting created and also old document is existing there as well with no changes. It was pretty clear that it would not delete it until we fixed it. Only reason to modify the sink config would be if you want to define the couchbase.document.id sink config property. Replication of data using Kafka…. Download Magic here! I have followed @darrenfu 's suggestion to the T, checked all the directories to be sure those are cleaned, and they are. verify the topic directory is deleted in zookeeper. Having consumers as part of the same consumer group means providing the“competing consumers” pattern with whom the messages from topic partitions are spread across the members of the group. Topic Configurations¶ This topic provides configuration parameters available for Confluent Platform. {“ID”:“W”,“USERNAME”:{“string”:“try456”},“PASSWORD”:{“string”:“345”},“MODIFIED”:1597450805000}. It facilitates topic management, QA and Integration Testing via convenient user interface and automation script editor. To get that to work, you can use an SMT to transform the output of the JDBC connector so the Kafka record’s key is the ID of the document to delete, and the Kafka record’s value is null. bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic mytopic. Then: The text was updated successfully, but these errors were encountered: On a MAC, I changed directories to: /usr/local/Cellar/zookeeper/3.4.9/bin You just need to set one property in the configuration to ‘true’, and issue a command to delete a topic. Instead, need to pass broker as argument. How to force delete a kafka topic when delete fails? privacy statement. The parameters are organized by order of importance, ranked from high to low. Returned no topics. Anything else to be done apart from this. connection.url=jdbc:oracle:thin:@hostname:1521/ORCL By default in Kafka version 0.10, delete.topic.enable ...READ MORE. If a Kafka consumer stays caught up to head of the log, it sees every record that is written. After I create a topic and then remove it (and wait for enough time to eventually delete it), it does not create a topic emitting errors even though auto-create topic option is true. Kafka is a distributed publish-subscribe messaging system that is designed to be fast, scalable and durable. connection.cluster_address=127.0.0.1 To enable it set the server config), *** The only way to delete a topic permanently is as follows: ***. ./kafka-topics.sh —zookeeper XX.XX.XX.XXX:2181 --alter --topic testTopic --deleteConfig retention.ms Exception in thread "main" joptsimple.UnrecognizedOptionException: 'deleteConfig' is not a recognized option at … Anybody facing the same issue? couchbase.persist.to=NONE I tried adding the below content to the file “/u01/kafka/confluent-5.5.1/etc/schema-registry/connect-avro-standalonekey.properties” and tried starting the source connector. In Kafka, we can create n number of topics as we want. Anything to be tweaked here ? Note: This will have no impact if delete.topic.enable is not set to true. Proposed Changes. connection.password=******** Thanks guys ... it worked . mode=timestamp+incrementing While working with kafka we, sometimes, need to purge records from a topic. 0 votes. Source : Oracle Database The Couchbase Sink will delete a document when the Kafka record has a null value. Topic deletion feature has been stable for about 2 years now. Most advised solutions missed on "rmr /config/topics/
". For more details, take another look at the “use a field of message as the document id” link in my previous post. Maybe it’s a case sensitivity issue. transforms.extractInt.type=org.apache.kafka.connect.transforms.ExtractField$Key couchbase.bootstrap.timeout=10s The behaviour is the same. Since the broker 100 is down and currently unavailable the topic deletion has only been recorded in Zookeeper. I still dont see update and delete working on the target (couchbase). Target : couchbase DB For example --zookeeper is not a valid option for listing consumer groups. TopicCommand issues topic deletion /usr/hdp/current/kafka-broker/bin/kafka-run-class.sh kafka.admin.TopicCommand --zookeeper rkk3.hdp.local:2181 --delete --topic sample We have been using kafka 0.8.2 for over a 1.5 years now and it has been working wonderfully for us, especially the HA provided by it via replicas. i.e. I need the command line which deletes the topics in kafka from the command prompt which was already created. No, defining the transform in the source config should be sufficient. Successfully merging a pull request may close this issue. *** This is a known issue *** Change default of delete.topic.enable to true; Remove the following lines from config/server.properties: # Switch to enable topic deletion or not, default value is false #delete.topic.enable=true You signed in with another tab or window. key.converter.schemas.enable=false. Already on GitHub? {“ID”:“W”,“USERNAME”:{“string”:“try456”},“PASSWORD”:{“string”:“2940”},“MODIFIED”:1597450749000} We didn’t actually set the delete.topic.enable parameter, so maybe our topic isn’t actually going to be deleted. It makes an extremely desirable option for data integration with the increasing complexity in real time data processing challenges. Hi, We had a week ago a case in which the client could not delete a topic from the cluster (Kafka version in this case was 1.0.0). kafka-python is best used with newer brokers (0.9+), but is backwards-compatible with older versions (to 0.8.0). I'm using the ASF release of 0.8.2.2 and I can confirm, topic deletion does not work. topic.prefix=ANUTC First […] Just delete the topic deletion in Zookeeper! Requesting your response. If you need to propagate deletions to Kafka, you can use a “soft delete” instead of actually deleting the row. I guess I’d recommend investigating how your Avro schema is defined, or looking into whether the source might be generating a byte array (not a number value) for the ID field. table.poll.interval.ms = 60 There is no difference in the output, it still give the same response with the below command : Note : The column with the name as “ID” is the primary key column in my oracle database (Source). ZooKeeper ACLs control which principal (for example, the broker principal) can update ZooKeeper nodes containing Kafka cluster metadata (such as in-sync replicas, topic configuration, and Kafka ACLs) and nodes used in inter-broker coordination (such as controller election, broker joining, and topic deletion). Each consumer receives messages from one or more partitions (“automatically” assigned to it) and the same messages won’t be received by the other consumers (assigned to different p… Generally, a topic refers to a particular heading or a name given to some specific inter-related ideas. connection.bucket=BucketPRD Deleting topic isn't always working in 0.8.1.1 Deletion ...READ MORE. value.converter.schemas.enable=false Basically, topics in Kafka are similar to tables in the database, but not containing all constraints. You can assign the key using Single Message Transforms (SMTs). The consumer sees all tombstones as long as the consumer reaches head of a log in a period less than the topic config delete… value.converter.schema.registry.url=http://localhost:8081 Hi Team, We are running 10 instance of node in the Production environment and each instance subscribe the same topic with common consumer "gropuid", however we had noticed that only one running instance of consumer are reading the message from subscribed topic, however other 9 are remain ideal, this causing us a huge performance issue. connector.class=io.confluent.connect.jdbc.JdbcSourceConnector A string that is either "delete" or "compact" or both. timestamp.column.name=MODIFIED It is great solution for applications that require large scale … You can get this information by running “kafka-topics.sh“ script with option “–describe”on topic “text_topic” Topic “text_topic” has 1 replication factor and … {“ID”:“V”,“USERNAME”:{“string”:“try”},“PASSWORD”:{“string”:“2930”},“MODIFIED”:1597399855000} table.whitelist=USERS1 Kafka Log Compaction Cleaning. Do I need to add these values in the sink connector as well? From what little I’ve read, it seems like the JDBC source connector has no way of knowing when you delete a row. transforms.createKey.fields=id This is specially needed in a development environment where we just want to get rid of some records and want to keep the other ones. And actually, if you don't add the topic name, it removes all topics. In this case, you have to change the retention time to 1 second, after which the messages from the topic will be … It is identified by its name, which depends on the user's choice. Even in the latest Kafka version (0.9.0), the deletion command below isn't always working. When I delete a record in the table on the source (oracle), I dont see the record getting deleted on the target (couchbase). bin/kafka-topics.sh --create --zookeeper ZookeeperConnectString--replication-factor 3 --partitions 1 --topic AWSKafkaTutorialTopic. Some of these commands are not working. Kafka Magic Community Edition is FREE for personal and business use. as shown in the graph, kafka didn't delete anything after passing 10GB (in other tests, it also got all the way to 40 and crashed again) Powered by Discourse, best viewed with JavaScript enabled, Update & Delete are not working with kafka as desired, assign the key using Single Message Transforms (SMTs), use a field of message as the document id, the JDBC source connector has no way of knowing when you delete a row. directory specified as log.dirs in Kafka and dataDir in Zookeeper. couchbase.replicate.to=NONE By default, the JDBC source connector does not assign a key to the published Kafka records. Python client for the Apache Kafka distributed stream processing system. then, Delete topic bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic myTopic. Accidentally deleted a topic, but hadn’t set delete.topic.enable in your server.properties file, and need to undo the topic deletion? transforms.createKey.type=org.apache.kafka.connect.transforms.ValueToKey tasks.max=3 When the topic was listed, there were no leaders assigned for the partitions. Hi, I've been getting problems with the consumer in CDH5.13.0. For other CDH-5.11.0 and CDH-5.12.0 versions with Kafka version : 0.10.2-kafka-2.2.0 are working fine. {“ID”:“U”,“USERNAME”:{“string”:“wholw”},“PASSWORD”:{“string”:“2830”},“MODIFIED”:1597399741000} Have you tried adding a couchbase.document.id property to the sink config? If you have trouble assigning the message key using the transforms, you can have the sink assign the document ID instead using the couchbase.document.id sink config property. value.converter=io.confluent.connect.avro.AvroConverter The Couchbase Sink will delete a document when the Kafka record has a nullvalue. Please let me know what should I do to fix the issue ? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. If a Kafka message doesn’t have a key, the Couchbase sink connector uses a synthetic key consisting of the Kafka topic, partition, and offset; every Kafka message will generate a unique document in Couchbase. ./zkCli -server localhost:2181 rmr /brokers/topics/ First set the retention time to something very low (1000 ms), wait a few seconds, then revert the retention times back to the previous value. transforms=createKey,extractInt bin/kafka-topics.sh --zookeeper localhost:2181 --list. #Added the below for key testing connection.user=kfkuser When I update a record on the source, it puts a new entry on the target (couchbase) instead of updating the already existing information. 3. So, in order to avoid such a catastrophic failure in production, I tried setting log.retention.bytes=10737418240 (10GB) and tested it to see if kafka deletes logs before it reaches a situation in which it crashes. {“ID”:“V”,“USERNAME”:{“string”:“try”},“PASSWORD”:{“string”:“2930”},“MODIFIED”:1597399855000} topics=ANUTCUSERS1 Just delete the topic deletion in Zookeeper! In Apache Kafka, the consumer group concept is a way of achieving two things: 1. I am getting the document name as shown below (myDocumentIdPrefix::WQ==) and the ID as “WQ==”, but actually the ID is auto generated in the source (oracle database) and its a number. This command will have no effect if in the Kafka server.properties file, if delete.topic.enable is not set to be true. ./bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic demo . I also tried adding this content to my JDBC source connector properties file but no luck. connection.username=Administrator Should it be ID instead of id in your transform definition? I installed kafka in windows from your instructions and is working well. It was developed by LinkedIn and opensourced in the year 2011. I tried to change the case as suggested from “id” to “ID”, but still no luck with it. 7 days. Kafka Tools – kafka-delete-records. ./zkCli -server localhost:2181 rmr /config/topics/ Queries : 1. This string designates the retention policy to use on old log segments. kafka-topics --list --zookeeper localhost:2181 Issue : Insert works fine, but update and delete are not working. Kafka topic not being deleted. We’ll occasionally send you account related emails. {“ID”:“U”,“USERNAME”:{“string”:“wholw”},“PASSWORD”:{“string”:“2830”},“MODIFIED”:1597399741000} kafka-console-consumer --bootstrap-server localhost:9092 --topic ANUTCUSERS1 --from-beginning, {“ID”:“T”,“USERNAME”:{“string”:“okfnine”},“PASSWORD”:{“string”:“2530”},“MODIFIED”:1597399208000} kafka-python is designed to function much like the official java client, with a sprinkling of pythonic interfaces (e.g., consumer iterators). cleanup.policy. connection.backoff.ms = 10 It would help me atleast if update is working fine on the target. As you may have noticed, kafka-topics.sh --delete will only delete a topic if the topic’s leader broker is available (and can acknowledge the removal). Can you please tell me what am I missing here ? To delete all the messages from a Kafka topic, you need to change the retention time of that topic the default retention time of Kafka topic is 168 hours, i.e. connection.password=************ What am I missing here? A producer publishes data to the topics, and a … Open a new terminal and type the following command − To start Kafka Broker, type the following command − After starting Kafka Broker, type the command jpson ZooKeeper terminal and you would see the following response − Now you could see two daemons running on the terminal where QuorumPeerMain is ZooKeeper daemon and another one is Kafka daemon. to your account. By clicking “Sign up for GitHub”, you agree to our terms of service and (Alternatively, you could research whether the Debezium Connector for Oracle meets your requirements.). The column with the name as “ID” is the primary key column in my oracle database (Source).**. I think it's time to change the default. Once this is done you can find and edit the line where you see: dirs=/tmp/kafka-logs to “log.dir= C:\kafka_2.11-0.9.0.0\kafka-logs If you have your Zookeeper running on some other machine then you can change this path to “zookeeper.connect:2181” to a customized IP and port id. Topic config min.compaction.lag.ms gets used to guarantee a minimum period that must pass before a message can be compacted. 2. ./zkCli -server localhost:2181 rmr /admin/delete_topics/. plugin.path=/u01/kafka/confluent-5.5.1/share connector.class=com.couchbase.connect.kafka.CouchbaseSinkConnector That’s probably why updates aren’t working – you need to assign a key to the Kafka records so Couchbase knows which document to update/delete. output.data.format=JSON, name=test-couchbase-sink first of make sure sever.properties file has and if not add delete.topic.enable=true. Get Kafka. If you need to delete all messages in topic, you can exploit the retention times. Have a question about this project? Or you can tell the Couchbase sink to use a field of message as the document id. Kafka Magic is a GUI tool for working with topics and messages in Apache Kafka® clusters. kafka don't have direct method for purge/clean-up topic (Queues), but can do this via deleting that topic and recreate it. Thanks again for your help and time. bin/kafka-topics.sh --delete --zookeeper localhost:2181 --topic (Note: Topic deletion option is disabled by default. In the recent versions of Apache’s Kafka, deleting a topic is easy. incrementing.column.name=ID To get that to work, you can use an SMT to transform the output of the JDBC connector so the Kafka record’s key is the ID of the document to delete, and the Kafka record’s value is null. Kafka Topics List existing topics. Kafka-2937 deals with the delete topic getting stuck because the LeaderAndISR in ZK was updated by a controller and then the controller dies and the new controller gets in to the exception and never completes deleting the topic. transforms.extractInt.field=id. then create it again. ... Delete a topic. Delete Topic: kafka-run-class.bat kafka.admin.TopicCommand --delete --topic [topic_to_delete] --zookeeper localhost:2181; Reference Links. The only way to ditch a topic is to stop the brokers, remove the directories on disk, remove the topic from zookeeper and start the brokers back up Jun Rao added a comment - 16/Oct/15 00:59 Added advertised.listeners also and i'm running in a non-secure environment. (Note: Topic deletion option is disabled by default. (6 replies) Hi All, I am facing issues deleting config for a topic in Kafka 0.9. Sep 4, 2018 in Apache Kafka by nitinrawat895 • 11,380 points • 749 views. Do I need to add these values in the sink connector as well. Download the latest Kafka release and extract it: $ tar -xzf kafka_2.13-2.6.0.tgz $ … The given parameter helps in achieving the update functionality in couchbase instead of inserting a new document as before. It works okay when I manually create a topic after deleting it. Before we remove an existing topic, first get the partition and replica of the existing topic as you would need these to re-create with the same configuration.
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