Timestamp field was added to the OffsetCommitRequest wire protocol api for 0.8.2 by
KAFKA-1012 . The 0.8.1.1 server does not support the timestamp field, so I think the api version of OffsetCommitRequest should be incremented and checked by the 0.8.2 kafka server before attempting to read a timestamp from the network buffer in OffsetCommitRequest.readFrom (core/src/main/scala/kafka/api/OffsetCommitRequest.scala)
It looks like a subsequent patch (
KAFKA-1462) added another api change to support a new constructor w/ params generationId and consumerId, calling that version 1, and a pending patch ( KAFKA-1634) adds retentionMs as another field, while possibly removing timestamp altogether, calling this version 2. So the fix here is not straightforward enough for me to submit a patch.
This could possibly be merged into
KAFKA-1634, but opening as a separate Issue because I believe the lack of versioning in the current trunk should block 0.8.2 release.