Greg Harris created KAFKA-14426:
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Summary: Add documentation for Kraft limtations that have open KIPs
Key: KAFKA-14426
URL: https://issues.apache.org/jira/browse/KAFKA-14426
Project: Kafka
Issue Type: Task
Components: documentation, kraft
Reporter: Greg Harris
Currently there are a number of limitations for Kraft, which are described as
the motivation for the following open KIPs:
*
[https://cwiki.apache.org/confluence/display/KAFKA/KIP-853%3A+KRaft+Voter+Changes]
*
[https://cwiki.apache.org/confluence/display/KAFKA/KIP-856%3A+KRaft+Disk+Failure+Recovery]
*
[https://cwiki.apache.org/confluence/display/KAFKA/KIP-650%3A+Enhance+Kafkaesque+Raft+semantics#KIP650:EnhanceKafkaesqueRaftsemantics-Pre-vote]
These limitations are:
* No online method of resizing the controller quorum
* No online method of recovering from controller disk loss
* No support for heterogeneous voter lists in running controller nodes
* When using a quorum size 3, there is no live-upgrade roll which is tolerant
of a single unplanned machine failure.
* When using a quorum size >3, there is a risk of non-linearizable reads.
These are significant enough concerns for operations of a Kraft-enabled cluster
that they should be documented as official limitations in the ops documentation.
Optionally, we may wish to provide or link to more detailed operations
documentation about performing the offline-resize or offline-recovery stages,
in addition to describing that such offline procedures are necessary.
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