def _on_changelog_sent(self, fut: FutureMessage) -> None:
# This is what keeps the offset in RocksDB so that at startup
# we know what offsets we already have data for in the database.
#
# Kafka Streams has a global ".checkpoint" file, but we store
# it in each individual RocksDB database file.
# Eevery partition in the table will have its own database file,
# this is required as partitions can easily move from and to
# machine as nodes die and recover.
res: RecordMetadata = fut.result()
self.data.set_persisted_offset(res.topic_partition, res.offset)
def _on_changelog_sent(self, fut: FutureMessage) -> None:
# This is what keeps the offset in RocksDB so that at startup
# we know what offsets we already have data for in the database.
#
# Kafka Streams has a global ".checkpoint" file, but we store
# it in each individual RocksDB database file.
# Every partition in the table will have its own database file,
# this is required as partitions can easily move from and to
# machine as nodes die and recover.
res: RecordMetadata = fut.result()
if self.app.in_transaction:
# for exactly-once semantics we only write the
# persisted offset to RocksDB on disk when that partition
# is committed.
self.app.tables.persist_offset_on_commit(
self.data, res.topic_partition, res.offset)
else:
# for normal processing (at-least-once) we just write
# the persisted offset immediately.
self.data.set_persisted_offset(res.topic_partition, res.offset)
