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. tasks.max=3 output.data.format=JSON, name=test-couchbase-sink It works okay when I manually create a topic after deleting it. connection.bucket=BucketPRD 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. Returned no topics. 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. Download Magic here! Issue : Insert works fine, but update and delete are not working. By default, the JDBC source connector does not assign a key to the published Kafka records. Accidentally deleted a topic, but hadn’t set delete.topic.enable in your server.properties file, and need to undo the topic deletion? If a Kafka consumer stays caught up to head of the log, it sees every record that is written. (Note: Topic deletion option is disabled by default. 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. The given parameter helps in achieving the update functionality in couchbase instead of inserting a new document as before. Get Kafka. Download the latest Kafka release and extract it: $ tar -xzf kafka_2.13-2.6.0.tgz $ … *** This is a known issue *** It was pretty clear that it would not delete it until we fixed it. In Kafka, the word topic refers to a category or a common name used to store and publish a particular stream of data. 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. i.e. 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. bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic mytopic. topics=ANUTCUSERS1 Replication of data using Kafka…. 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. Note : The column with the name as “ID” is the primary key column in my oracle database (Source). to your account. I tried to change the case as suggested from “id” to “ID”, but still no luck with it. 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. We didn’t actually set the delete.topic.enable parameter, so maybe our topic isn’t actually going to be deleted. Instead, need to pass broker as argument. By clicking “Sign up for GitHub”, you agree to our terms of service and bin/kafka-topics.sh --delete --zookeeper localhost:2181 --topic (Note: Topic deletion option is disabled by default. If you need to propagate deletions to Kafka, you can use a “soft delete” instead of actually deleting the row. plugin.path=/u01/kafka/confluent-5.5.1/share Successfully merging a pull request may close this issue. Topic Configurations¶ This topic provides configuration parameters available for Confluent Platform. The column with the name as “ID” is the primary key column in my oracle database (Source).**. Added advertised.listeners also and i'm running in a non-secure environment. ./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 … 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. Source : Oracle Database 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. connection.backoff.ms = 10 first of make sure sever.properties file has and if not add delete.topic.enable=true. connector.class=io.confluent.connect.jdbc.JdbcSourceConnector transforms.extractInt.type=org.apache.kafka.connect.transforms.ExtractField$Key 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. You just need to set one property in the configuration to ‘true’, and issue a command to delete a topic. {“ID”:“W”,“USERNAME”:{“string”:“try456”},“PASSWORD”:{“string”:“2940”},“MODIFIED”:1597450749000} Anybody facing the same issue? poll.interval.ms = 50 {“ID”:“V”,“USERNAME”:{“string”:“try”},“PASSWORD”:{“string”:“2930”},“MODIFIED”:1597399855000} Even in the latest Kafka version (0.9.0), the deletion command below isn't always working. I also tried adding this content to my JDBC source connector properties file but no luck. $ docker exec broker-tutorial kafka-topics --delete --zookeeper zookeeper:2181 --topic blog-dummy Topic blog-dummy is marked for deletion. There is no difference in the output, it still give the same response with the below command : Already on GitHub? table.poll.interval.ms = 60 Maybe it’s a case sensitivity issue. 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) ./zkCli -server localhost:2181 rmr /brokers/topics/ When the topic was listed, there were no leaders assigned for the partitions. kafka-python is designed to function much like the official java client, with a sprinkling of pythonic interfaces (e.g., consumer iterators). Thanks guys ... it worked . If you want to delete all the topics created, Then Stop Kafka and zookeeper and delete data/log directories of both. A string that is either "delete" or "compact" or both. If the command succeeds, you see the following message: Created topic AWSKafkaTutorialTopic. 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. Kafka Magic is a GUI tool for working with topics and messages in Apache Kafka® clusters. connection.cluster_address=127.0.0.1 Sign in First […] It makes an extremely desirable option for data integration with the increasing complexity in real time data processing challenges. 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. transforms=createKey,extractInt Delete Topic: kafka-run-class.bat kafka.admin.TopicCommand --delete --topic [topic_to_delete] --zookeeper localhost:2181; Reference Links. Just delete the topic deletion in Zookeeper! ./bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic demo . Just delete the topic deletion in Zookeeper! When I update a record on the source, it puts a new entry on the target (couchbase) instead of updating the already existing information. ./zkCli -server localhost:2181 rmr /admin/delete_topics/. 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. Do I need to add these values in the sink connector as well? We’ll occasionally send you account related emails. {“ID”:“V”,“USERNAME”:{“string”:“try”},“PASSWORD”:{“string”:“2930”},“MODIFIED”:1597399855000} transforms.createKey.fields=id topic.prefix=ANUTC Topic config min.compaction.lag.ms gets used to guarantee a minimum period that must pass before a message can be compacted. No, defining the transform in the source config should be sufficient. (6 replies) Hi All, I am facing issues deleting config for a topic in Kafka 0.9. 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). directory specified as log.dirs in Kafka and dataDir in Zookeeper. Queries : 1. Requesting your assistance on the below : 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. For more details, take another look at the “use a field of message as the document id” link in my previous post. 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… key.converter.schemas.enable=false. 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. Generally, a topic refers to a particular heading or a name given to some specific inter-related ideas. While working with kafka we, sometimes, need to purge records from a topic. 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 … The parameters are organized by order of importance, ranked from high to low. If you need to delete all messages in topic, you can exploit the retention times. 3. connection.user=kfkuser I have followed @darrenfu 's suggestion to the T, checked all the directories to be sure those are cleaned, and they are. Since the broker 100 is down and currently unavailable the topic deletion has only been recorded in Zookeeper. When I delete a record in the table on the source (oracle), I dont see the record getting deleted on the target (couchbase). By default in Kafka version 0.10, delete.topic.enable ...READ MORE. In Kafka, we can create n number of topics as we want. Can you please tell me what am I missing here ? 7 days. 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. This string designates the retention policy to use on old log segments. Only reason to modify the sink config would be if you want to define the couchbase.document.id sink config property. 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 2. For example --zookeeper is not a valid option for listing consumer groups. 0 votes. {“ID”:“W”,“USERNAME”:{“string”:“try456”},“PASSWORD”:{“string”:“345”},“MODIFIED”:1597450805000}. Should it be ID instead of id in your transform definition? In the recent versions of Apache’s Kafka, deleting a topic is easy. Please let me know what should I do to fix the issue ? 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 Do I need to add these values in the sink connector as well. Anything to be tweaked here ? name=testusersUTC Basically, topics in Kafka are similar to tables in the database, but not containing all constraints. table.whitelist=USERS1 Some of these commands are not working. Deleting topic isn't always working in 0.8.1.1 Deletion ...READ MORE. timestamp.column.name=MODIFIED 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. kafka don't have direct method for purge/clean-up topic (Queues), but can do this via deleting that topic and recreate it. value.converter=io.confluent.connect.avro.AvroConverter value.converter.schemas.enable=false Python client for the Apache Kafka distributed stream processing system. And actually, if you don't add the topic name, it removes all topics. Most advised solutions missed on "rmr /config/topics/". then, Delete topic bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic myTopic. Kafka topic not being deleted. connection.url=jdbc:oracle:thin:@hostname:1521/ORCL 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). 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. transforms.createKey.type=org.apache.kafka.connect.transforms.ValueToKey The behaviour is the same. then create it again. {“ID”:“U”,“USERNAME”:{“string”:“wholw”},“PASSWORD”:{“string”:“2830”},“MODIFIED”:1597399741000} It facilitates topic management, QA and Integration Testing via convenient user interface and automation script editor. Kafka Tools – kafka-delete-records. #Added the below for key testing verify the topic directory is deleted in zookeeper. The Couchbase Sink will delete a document when the Kafka record has a nullvalue. connection.username=Administrator bin/kafka-topics.sh --zookeeper localhost:2181 --list. ./zkCli -server localhost:2181 rmr /config/topics/ From what little I’ve read, it seems like the JDBC source connector has no way of knowing when you delete a row. Kafka Magic Community Edition is FREE for personal and business use. Hi, I've been getting problems with the consumer in CDH5.13.0. Kafka Log Compaction Cleaning. Note: This will have no impact if delete.topic.enable is not set to true. I think it's time to change the default. connection.password=******** 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). ... Delete a topic. Proposed Changes. incrementing.column.name=ID 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 How to force delete a kafka topic when delete fails? What am I missing here? I need the command line which deletes the topics in kafka from the command prompt which was already created. It is great solution for applications that require large scale … Have you tried adding a couchbase.document.id property to the sink config? Any suggestions from here? 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). value.converter.schema.registry.url=http://localhost:8081 It is identified by its name, which depends on the user's choice. Anything else to be done apart from this. tasks.max=2 The consumer sees all tombstones as long as the consumer reaches head of a log in a period less than the topic config delete… Target : couchbase DB couchbase.persist.to=NONE privacy statement. 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 To enable it set the server config), *** The only way to delete a topic permanently is as follows: ***. 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. couchbase.replicate.to=NONE 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. Kafka is a distributed publish-subscribe messaging system that is designed to be fast, scalable and durable. {“ID”:“U”,“USERNAME”:{“string”:“wholw”},“PASSWORD”:{“string”:“2830”},“MODIFIED”:1597399741000} This command will have no effect if in the Kafka server.properties file, if delete.topic.enable is not set to be true. You can assign the key using Single Message Transforms (SMTs). kafka-console-consumer --bootstrap-server localhost:9092 --topic ANUTCUSERS1 --from-beginning, {“ID”:“T”,“USERNAME”:{“string”:“okfnine”},“PASSWORD”:{“string”:“2530”},“MODIFIED”:1597399208000} connection.password=************ I installed kafka in windows from your instructions and is working well. transforms.extractInt.field=id. Or you can tell the Couchbase sink to use a field of message as the document id. Even in the latest Kafka version (0.9.0), the deletion command below isn't always working. (Alternatively, you could research whether the Debezium Connector for Oracle meets your requirements.). Requesting your response. You signed in with another tab or window. It was developed by LinkedIn and opensourced in the year 2011. I still dont see update and delete working on the target (couchbase). In this case, you have to change the retention time to 1 second, after which the messages from the topic will be … kafka-python is best used with newer brokers (0.9+), but is backwards-compatible with older versions (to 0.8.0). Then: couchbase.bootstrap.timeout=10s mode=timestamp+incrementing 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. cleanup.policy. Have a question about this project? In Apache Kafka, the consumer group concept is a way of achieving two things: 1. key.converter=org.apache.kafka.connect.storage.StringConverter Topic deletion feature has been stable for about 2 years now. Kafka Topics List existing topics. connector.class=com.couchbase.connect.kafka.CouchbaseSinkConnector 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. It would help me atleast if update is working fine on the target. kafka-topics --list --zookeeper localhost:2181 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. Sep 4, 2018 in Apache Kafka by nitinrawat895 • 11,380 points • 749 views. bin/kafka-topics.sh --create --zookeeper ZookeeperConnectString--replication-factor 3 --partitions 1 --topic AWSKafkaTutorialTopic. I'm using the ASF release of 0.8.2.2 and I can confirm, topic deletion does not work. The Couchbase Sink will delete a document when the Kafka record has a null value. Thanks again for your help and time. 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. To enable it set the server config) delete.topic.enable=true Bug to track: KAFKA-1397 Sign up for a free GitHub account to open an issue and contact its maintainers and the community. A producer publishes data to the topics, and a …

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