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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6352) FlinkKafkaConsumer should support to use timestamp to set up start offset
Date Tue, 16 May 2017 08:05:05 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16011942#comment-16011942
] 

ASF GitHub Bot commented on FLINK-6352:
---------------------------------------

Github user tzulitai commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3915#discussion_r116675159
  
    --- Diff: flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumerBase.java
---
    @@ -290,10 +296,30 @@ public FlinkKafkaConsumerBase(List<String> topics, KeyedDeserializationSchema<T>
     	public FlinkKafkaConsumerBase<T> setStartFromGroupOffsets() {
     		this.startupMode = StartupMode.GROUP_OFFSETS;
     		this.specificStartupOffsets = null;
    +		this.specificStartupDate = null;
     		return this;
     	}
     
     	/**
    +	 * Specifies the consumer to start reading partitions from specific date. The specified
date must before curr timestamp.
    +	 * This lets the consumer ignore any committed group offsets in Zookeeper / Kafka brokers.
    +	 *
    +	 * The consumer will look up the earliest offset whose timestamp is greater than or
equal to the specific date from the kafka.
    --- End diff --
    
    the kafka --> just "Kafka", with K capitalized.


> 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
>            Assignee: 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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