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From 네이버 <k5...@naver.com>
Subject unsubscribtion
Date Wed, 08 Aug 2018 06:18:30 GMT


> On 7 Aug 2018, at 19:42, Yan Zhou [FDS Science] <yzhou@coupang.com> wrote:
> 
> Thank you Vino. It is very helpful.
> From: vino yang <yanghua1127@gmail.com>
> Sent: Tuesday, August 7, 2018 7:22:50 PM
> To: Yan Zhou [FDS Science]
> Cc: user
> Subject: Re: checkpoint recovery behavior when kafka source is set to start from timestamp
>  
> Hi Yan Zhou:
> 
> I think the java doc of the setStartFromTimestamp method has been explained very clearly,
posted here:
> 
> /**
> * Specify the consumer to start reading partitions from a specified timestamp.
> * The specified timestamp must be before the current timestamp.
> * This lets the consumer ignore any committed group offsets in Zookeeper / Kafka brokers.
> *
> * <p>The consumer will look up the earliest offset whose timestamp is greater than
or equal
> * to the specific timestamp from Kafka. If there's no such offset, the consumer will
use the
> * latest offset to read data from kafka.
> *
> * <p>This method does not affect where partitions are read from when the consumer
is restored
> * from a checkpoint or savepoint. When the consumer is restored from a checkpoint or
> * savepoint, only the offsets in the restored state will be used.
> *
> * @param startupOffsetsTimestamp timestamp for the startup offsets, as milliseconds from
epoch.
> *
> * @return The consumer object, to allow function chaining.
> */
> 
> Thanks, vino.
> 
> Yan Zhou [FDS Science] <yzhou@coupang.com> 于2018年8月8日周三 上午9:06写道:
> Hi Experts,
> 
> In my application, the kafka source is set to start from a specified timestamp, by calling
method FlinkKafkaConsumer010#setStartFromTimestamp(long startupOffsetsTimestamp). 
> 
> If the application have run a while and then recover from a checkpoint because of failure,
what's the offset will the kafka source to read from? I suppose it will read from the offset
that has been committed before the failure. Is it right? 
> 
> I am going to verify it, however some clarification is good in case my test result doesn't
meet my assumption.
> 
> Best
> Yan
> 

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