[KAFKA-10401] GroupMetadataManager ignores current_state_timestamp field for GROUP_METADATA_VALUE_SCHEMA_V3

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.1.1, 2.2.2, 2.4.1, 2.6.0, 2.5.1
• Fix Version/s: 2.3.2, 2.4.2, 2.7.0, 2.5.2, 2.6.1
• Component/s: offset manager
• Assignee: Luke Chen
• Reporter: Marek
• Created: 14/Aug/20 07:15
• Updated: 22/Sep/20 03:23
• Resolved: 21/Sep/20 21:06

Description

While reading group metadata information from ByteBuffer GroupMetadataManager reads current_state_timestamp only for group schema version 2. For all other versions this value is set to "None". 

Piece of code responsible for the bug:

https://github.com/apache/kafka/blob/2.6.0/core/src/main/scala/kafka/coordinator/group/GroupMetadataManager.scala#L1412

Restarting kafka forces GroupMetadataManager manager to reload group metadata from file basically causing [KIP-211|https://cwiki.apache.org/confluence/display/KAFKA/KIP-211%3A+Revise+Expiration+Semantics+of+Consumer+Group+Offsets] to be only applicable for schema version 2. 

 

 

Issue Links

• links to: GitHub Pull Request #9202