datalake: remove offset translation from translation_stm (and add compaction_test.py)
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And most importantly, add the function `get_translated_log_offset()`. This function will be used to compute the appropriate highest translated log offset for a given translated kafka offset while taking into account translator batches. This is an important function for removing offset translation from within the `translation_stm`, and to be less pessimistic about the `max_collectible_offset` returned by the `stm` in the future.
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WillemKauf
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Dec 18, 2024
| @@ -24,22 +24,24 @@ | |||
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| class DatalakeVerifier(): | |||
| """ | |||
| Verifier that does the verification of the data in the redpanda Iceberg table. | |||
| The verifier consumes offsets from specified topic and verifies it the data | |||
| Verifier that does the verification of the data in the redpanda Iceberg table. | |||
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CI test resultstest results on build#59935
test results on build#60023
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Lot of Not sure if this is another The only related change I can see in EDIT: Probably just because of the |
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Make use of the added utility function `get_translated_log_offset()` throughout `partition_translator.cc` and `state_machine.cc` in order to update the `translation_stm::_highest_translated_log_offset` as translation occurs. `translation_stm::max_collectible_offset()` now returns the `_highest_translated_log_offset` instead of performing offset translation for the `highest_translated_offset`, which is currently more restrictive than it should be for housekeeping (due to it being translator batch unaware).
By handling gaps in offsets and recording seen keys, we can validate the correctness of a compacted log that has been translated (fully) into an iceberg table.
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Adds a new `test_compaction` test, which uses the `KgoVerifierSeqConsumer` to validate a fully compacted log, along with the `datalake_verifier` service to validate the Iceberg table. Also moves the contents of `compaction_gaps_test.py` into `compaction_test.py`.
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Previously, the
datalake::translation::translation_stmwould return its max collectible as the following:redpanda/src/v/datalake/translation/state_machine.cc
Lines 112 to 122 in 925707c
This offset translation leads to an overly restrictive condition for the max collectible offset, due to the fact that it is translation batch unaware.
Here, the utility function
get_translated_log_offset()is added, which returns the "equivalent" translated log offset for a given kafka offset, taking into account translation batches (which don't need to be translated, and thus shouldn't restrict the max collectible offset).Use of this function is plumbed through the
partition_translatorand thetranslation_stm, and we now bookkeep the_highest_translated_log_offsetin thetranslation_stmto avoid any offset translation within it.Additionally, a new test for compaction with an Iceberg enabled topic is added to
datalake/compaction_test.py, with some enhancements to thedatalake_verifierservice to make it compaction aware.Backports Required
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