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  1. Kafka
  2. KAFKA-6121

Restore and global consumer should not use auto.offset.reset




      Streams uses three different consumers internally. The main consumer, as well as one consumer for state restore (restore consumer, also used by StandbyTasks) and a consumer for global state (used by GlobalThreadThread). While main consumer handles InvalidOffsetException correctly, restore and global consumer don't. Currently, they rely on auto.offset.reset with default value "latest" – thus, if there is an InvalidOffsetException we just jump to the end of the changelog topic instead of proper handler this case.

      An InvalidOffsetException can occur for two cases:

      1. An Kafka Streams application is offline for some time and on restart it reads it local offset file. This offset file might contain offsets that are not valid anymore as the log got compacted in between.
      2. Even if we have valid offset and we do a seek, log compaction can actually tick an in the background at any point and could make our offset invalid – this is a rather rare race conditions but we need to handle it anyway

      For both cases, we can apply the same strategy: wipe out the local RocksDB, seekToBeginning, and recreate the store from scratch. Thus, we need to set auto.offset.reset to "none" for each consumer and handle InvalidOffsetException that might be throw by poll() or position().


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              • Assignee:
                mjsax Matthias J. Sax
                mjsax Matthias J. Sax
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