[FLINK-7964] Add Apache Kafka 1.0/1.1 connectors

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Won't Do
• Affects Version/s: 1.4.0
• Component/s: Connectors / Kafka
• Labels: pull-request-available
• Assignee: vinoyang
• Reporter: Hai Zhou
• Created: 02/Nov/17 12:41
• Updated: 02/Oct/19 17:48
• Resolved: 19/Oct/18 12:25

Description

Kafka 1.0.0 is no mere bump of the version number. The Apache Kafka Project Management Committee has packed a number of valuable enhancements into the release. Here is a summary of a few of them:

• Since its introduction in version 0.10, the Streams API has become hugely popular among Kafka users, including the likes of Pinterest, Rabobank, Zalando, and The New York Times. In 1.0, the the API continues to evolve at a healthy pace. To begin with, the builder API has been improved (KIP-120). A new API has been added to expose the state of active tasks at runtime (KIP-130). The new cogroup API makes it much easier to deal with partitioned aggregates with fewer StateStores and fewer moving parts in your code (KIP-150). Debuggability gets easier with enhancements to the print() and writeAsText() methods (KIP-160). And if that’s not enough, check out KIP-138 and KIP-161 too. For more on streams, check out the Apache Kafka Streams documentation, including some helpful new tutorial videos.
• Operating Kafka at scale requires that the system remain observable, and to make that easier, we’ve made a number of improvements to metrics. These are too many to summarize without becoming tedious, but Connect metrics have been significantly improved (KIP-196), a litany of new health check metrics are now exposed (KIP-188), and we now have a global topic and partition count (KIP-168). Check out KIP-164 and KIP-187 for even more.
• We now support Java 9, leading, among other things, to significantly faster TLS and CRC32C implementations. Over-the-wire encryption will be faster now, which will keep Kafka fast and compute costs low when encryption is enabled.
• In keeping with the security theme, KIP-152 cleans up the error handling on Simple Authentication Security Layer (SASL) authentication attempts. Previously, some authentication error conditions were indistinguishable from broker failures and were not logged in a clear way. This is cleaner now.
• Kafka can now tolerate disk failures better. Historically, JBOD storage configurations have not been recommended, but the architecture has nevertheless been tempting: after all, why not rely on Kafka’s own replication mechanism to protect against storage failure rather than using RAID? With KIP-112, Kafka now handles disk failure more gracefully. A single disk failure in a JBOD broker will not bring the entire broker down; rather, the broker will continue serving any log files that remain on functioning disks.
• Since release 0.11.0, the idempotent producer (which is the producer used in the presence of a transaction, which of course is the producer we use for exactly-once processing) required max.in.flight.requests.per.connection to be equal to one. As anyone who has written or tested a wire protocol can attest, this put an upper bound on throughput. Thanks to KAFKA-5949, this can now be as large as five, relaxing the throughput constraint quite a bit.

Issue Links

• is duplicated by: FLINK-7966 Create flink-connector-kafka-1.0 submodule
• is duplicated by: FLINK-8152 Add Kafka 1.0.0 connector
• is duplicated by: FLINK-10067 Add Kafka 1.0.0/1.1.0 connectors
• is related to: FLINK-9697 Provide connector for modern Kafka
• relates to: FLINK-9690 Restoring state with FlinkKafkaProducer and Kafka 1.1.0 client fails
• relates to: FLINK-9700 Document FlinkKafkaProducer behaviour for Kafka versions > 0.11
• links to: GitHub Pull Request #6577