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Posted to issues@flink.apache.org by "Fang Yong (JIRA)" <ji...@apache.org> on 2017/04/21 06:54:04 UTC
[jira] [Commented] (FLINK-6352) FlinkKafkaConsumer should support
to use timestamp to set up start offset
[ https://issues.apache.org/jira/browse/FLINK-6352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15978177#comment-15978177 ]
Fang Yong commented on FLINK-6352:
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Hi [~tzulitai], [~rmetzger], what do you think about this? Or anyone has some suggestions, pleas feel free to comment here.
> FlinkKafkaConsumer should support to use timestamp to set up start offset
> -------------------------------------------------------------------------
>
> Key: FLINK-6352
> URL: https://issues.apache.org/jira/browse/FLINK-6352
> Project: Flink
> Issue Type: Improvement
> Components: Kafka Connector
> Reporter: Fang Yong
> Fix For: 1.3.0
>
>
> Currently "auto.offset.reset" is used to initialize the start offset of FlinkKafkaConsumer, and the value should be earliest/latest/none. This method can only let the job comsume the beginning or the most recent data, but can not specify the specific offset of Kafka began to consume.
> So, there should be a configuration item (such as "flink.source.start.time" and the format is "yyyy-MM-dd HH:mm:ss") that allows user to configure the initial offset of Kafka. The action of "flink.source.start.time" is as follows:
> 1) job start from checkpoint / savepoint
> a> offset of partition can be restored from checkpoint/savepoint, "flink.source.start.time" will be ignored.
> b> there's no checkpoint/savepoint for the partition (For example, this partition is newly increased), the "flink.kafka.start.time" will be used to initialize the offset of the partition
> 2) job has no checkpoint / savepoint, the "flink.source.start.time" is used to initialize the offset of the kafka
> a> the "flink.source.start.time" is valid, use it to set the offset of kafka
> b> the "flink.source.start.time" is out-of-range, the same as it does currently with no initial offset, get kafka's current offset and start reading
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