sjvanrossum opened a new pull request, #32921:
URL: https://github.com/apache/beam/pull/32921
This reverts #31137 and #31281. The changes in the former PR overwrite the
per-split metric `backlog_bytes.${SPLIT}` with the per-partition metric rather
than the accumulated value for the split. The latter PR introduced a map to
store metrics for all past and current splits (1 partition) of the
`ReadFromKafkaDoFn` instance and may repeatedly overwrite non-current splits
with stale values. The map used to store these values is not thread-safe and
may trigger a `ConcurrentModificationException` since `GetSize` and other SDF
methods may concurrently attempt to read and write the map.
Finally, the per-split caches kept by the instance are keyed on
`TopicPartition`, which is not unique among all splits since the split may
override the bootstrap server. This has been fixed for this cache, all other
caches will be patched in a separate PR.
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