deemogsw commented on code in PR #62:
URL: https://github.com/apache/rocketmq-flink/pull/62#discussion_r990774736
##########
README.md:
##########
@@ -123,13 +128,40 @@ The following configurations are all from the class
`org.apache.rocketmq.flink.l
| consumer.group | consumer group *Required* | null |
| consumer.topic | consumer topic *Required* | null |
| consumer.tag | consumer topic tag | * |
-| consumer.offset.reset.to | what to do when there is no initial offset on the
server | latest/earliest/timestamp |
-| consumer.offset.from.timestamp | the timestamp when
`consumer.offset.reset.to=timestamp` was set | `System.currentTimeMillis()`
|
| consumer.offset.persist.interval | auto commit offset interval |
5000 |
| consumer.pull.thread.pool.size | consumer pull thread pool size | 20
|
| consumer.batch.size | consumer messages batch size | 32 |
| consumer.delay.when.message.not.found | the delay time when messages were
not found | 10 |
+### Consumer From Where
+
+```java
+RocketMQSourceFunction<String> source = new RocketMQSourceFunction<>(
+ new SimpleStringDeserializationSchema(), props);
+HashMap<MessageQueue, Long> brokerMap = new HashMap<>();
+brokerMap.put(new MessageQueue("tp_driver_tag_sync_back", "broker-a", 1),
201L);
+brokerMap.put(new MessageQueue("tp_driver_tag_sync_back", "broker-c", 3),
123L);
+source.setStartFromSpecificOffsets(brokerMap);
+```
+RocketMQSourceFunction offer five initialization policies
+* setStartFromEarliest
+* setStartFromLatest
+* setStartFromTimeStamp with timestamp
+* setStartFromGroupOffsets with `OffsetResetStrategy`
+* setStartFromSpecificOffsets
+
+| STRATEGY | DESCRIPTION
|
+| ----------------------------------- |
------------------------------------------------------------ |
+| StartFromEarliest | consume from the earliest offset after
restart with no state |
Review Comment:
StartupMode enum is set by
RocketMQSourceFunction#setStartFrom[Latest/Earliest/...]
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