Abacn commented on code in PR #39461:
URL: https://github.com/apache/beam/pull/39461#discussion_r3776191523
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sdks/python/apache_beam/io/fileio.py:
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@@ -292,32 +293,51 @@ def state_coder(self):
return VarIntCoder()
+def _mtime_of(metadata: filesystem.FileMetadata, option: str) -> float:
+ # A missing (zero) timestamp is rejected because every file would then carry
+ # the same one, and updates could never be told apart.
+ if not metadata.last_updated_in_seconds:
+ raise BeamIOError(
+ 'MatchContinuously(%s=True) requires file last-modified times, but '
+ '%s reports none.' % (option, metadata.path))
+ return metadata.last_updated_in_seconds
+
+
+def _mtime_timestamp(metadata: filesystem.FileMetadata) -> Timestamp:
+ # Floored to the millisecond a runner keeps for element timestamps, so the
+ # cursor compares against the same resolution it is persisted at.
+ micros = Timestamp.of(_mtime_of(metadata, 'timestamp_cursor')).micros
+ return Timestamp(micros=micros - micros % 1000)
Review Comment:
> I put allowed_lateness on Watch only and did not surface it on
MatchContinuously
This looks fine to me. It's fine filesystem clock and pipeline runtime clock
has offset. If modified files timestamp is one-way, it's fine then
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