feat: Add max message per batch option#14
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@@ Coverage Diff @@
## master #14 +/- ##
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+ Coverage 57.25% 58.28% +1.02%
- Complexity 79 81 +2
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Files 17 17
Lines 503 525 +22
Branches 16 18 +2
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+ Hits 288 306 +18
- Misses 212 216 +4
Partials 3 3
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dpcollins-google
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Jan 26, 2021
| Map<Partition, SparkPartitionOffset> map = new HashMap<>(); | ||
| for (int i = 0; i < topicPartitionCount; i++) { | ||
| Partition p = Partition.of(i); | ||
| SparkPartitionOffset emptyPartition = SparkPartitionOffset.create(p, -1L); |
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not for here, but can you check that this doesn't error out when the partition is actually empty?
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will do in real test.
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Jan 28, 2021
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Approved. Consider addressing nits before submitting
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With only PSL flow control, it's not enough to stop Spark executors from OOMing when the batch is large (large backlog). This adds support for hard limiting the max message per batch.
Note that startOffset + batch_offset_range might land on a non-message offset. Under the assumptions that headoffset - 1 is a message offset (the only corner case is broker ungracefully shut down and no new message to unblock), startOffset + batch_offset_range will be unblocked even if it is not a non-message offset.
Staging tested that adding this new option it won't OOM anymore.
EDIT: actually kafka has same parameter https://screenshot.googleplex.com/57nu34SUfMvcRr5.