boyuanzz commented on a change in pull request #11749:
URL: https://github.com/apache/beam/pull/11749#discussion_r442951203
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File path:
sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaIO.java
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@@ -681,11 +696,13 @@ public void setValueDeserializer(String
valueDeserializer) {
}
/**
- * Sets {@link TimestampPolicy} to {@link
TimestampPolicyFactory.LogAppendTimePolicy}. The
- * policy assigns Kafka's log append time (server side ingestion time) to
each record. The
- * watermark for each Kafka partition is the timestamp of the last record
read. If a partition
- * is idle, the watermark advances to couple of seconds behind wall time.
Every record consumed
- * from Kafka is expected to have its timestamp type set to
'LOG_APPEND_TIME'.
+ * Sets {@link TimestampPolicy} to {@link
TimestampPolicyFactory.LogAppendTimePolicy} which is
+ * used when beam_fn_api is disabled, and sets {@code
extractOutputTimestampFn} as {@link
+ * ReadViaSDF.ExtractOutputTimestampFns#withLogAppendTime()}, which is
used when beam_fn_api is
+ * enabled. The policy assigns Kafka's log append time (server side
ingestion time) to each
+ * record. The watermark for each Kafka partition is the timestamp of the
last record read. If a
+ * partition is idle, the watermark advances to couple of seconds behind
wall time. Every record
+ * consumed from Kafka is expected to have its timestamp type set to
'LOG_APPEND_TIME'.
Review comment:
The ` which is used when beam_fn_api is disabled` means
`TimestampPolicy` is used when beam_fn_api is disabled. I'll say it explicitly.
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