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public interface Consumer<K,V> extends Closeable { | |
/** | |
* Returns the currently consumed but uncommitted offsets. | |
*/ | |
Map<TopicPartition, OffsetAndMetadata> uncommittedOffsets(); | |
/** | |
* Returns the consumer group id. | |
*/ |
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public class TransactionResponse { | |
/** | |
* All the error codes that may be returned by transactional methods. | |
*/ | |
public enum TransactionError { | |
PRODUCER_FENCED, | |
NO_PID_MAPPING, | |
NOT_COORDINATOR_FOR_APP_ID, | |
INVALID_TXN_REQUEST, |
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public interface Producer<K,V> extends Closeable { | |
/** | |
* Needs to be called before any of the other transaction methods. Assumes that | |
* the producer.app.id is specified in the producer configuration. | |
* | |
* This method does the following: | |
* 1. Ensures any transactions initiated by previous instances of the producer | |
* are committed or rolled back. | |
* 2. Gets the internal producer id and epoch, used in all future transactional |
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public class KafkaTransactionsExample { | |
public static void main(String args[]) { | |
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(consumerConfig); | |
// Note that the ‘transaction.app.id’ configuration _must_ be specified in the | |
// producer config in order to use transactions. | |
KafkaProducer<String, String> producer = new KafkaProducer<>(producerConfig); |
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ksql> show topics; | |
Kafka Topic | Registered | Partitions | Partition Replicas | Consumers | Consumer Groups | |
---------------------------------------------------------------------------------------------------------- | |
__confluent.support.metrics | false | 1 | 1 | 0 | 0 | |
_schemas | false | 1 | 1 | 0 | 0 | |
connect-configs | false | 1 | 1 | 0 | 0 | |
connect-offsets | false | 25 | 1 | 0 | 0 | |
connect-statuses | false | 5 | 1 | 0 | 0 | |
groupbydevice | true | 4 | 1 | 0 | 0 |
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ksql> print 'pageviews_kafka_topic_json'; | |
Format:JSON | |
{"ROWTIME":1516753301093,"ROWKEY":"1","viewtime":1516753300961,"pageid":"Page_53","userid":"User_9"} | |
{"ROWTIME":1516753301458,"ROWKEY":"11","viewtime":1516753301458,"pageid":"Page_38","userid":"User_5"} | |
{"ROWTIME":1516753301660,"ROWKEY":"21","viewtime":1516753301660,"pageid":"Page_25","userid":"User_2"} | |
^C |
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SELECT orderzip_code, TOPK(order_total, 5) FROM orders WINDOW TUMBLING (SIZE 1 HOUR) GROUP BY order_zipcode; |
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SELECT pageid, TOPKDISTINCT(viewtime, 5) FROM pageviews_users GROUP BY pageid; |
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$ ./bin/ksql-print-metrics | |
messages-consumed-avg: 96416.96196183885 | |
messages-consumed-min: 88900.3329377909 | |
error-rate: 0.0 | |
num-persistent-queries: 2.0 | |
messages-consumed-per-sec: 193024.78294586178 | |
messages-produced-per-sec: 193025.4730374501 | |
num-active-queries: 2.0 | |
num-idle-queries: 0.0 | |
messages-consumed-max: 103397.81191436431 |
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ksql> show queries; | |
Query ID | Kafka Topic | Query String | |
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | |
CSAS_PAGEVIEWS_ENRICHED | PAGEVIEWS_ENRICHED | CREATE STREAM pageviews_enriched AS SELECT users_original.userid AS userid, pageid, regionid, gender FROM pageviews_original LEFT JOIN users_original ON pageviews_original.userid = users_original.userid; | |
CSAS_PAGEVIEWS_FEMALE | PAGEVIEWS_FEMALE | CREATE STREAM pageviews_female AS SELECT * FROM pageviews_enriched WHERE gender = 'FEMALE'; | |
CSAS_PAGEVIEWS_FEMALE_LIKE_89 | pageviews_enriched_r8_r9 | CREATE STREAM pageviews_female_like_89 WITH (kaf |
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