Re: the uniqueSource in StreamExecution, where is it be changedplease?

[萝卜丝炒饭 <14...@qq.com>]

Hi Hsieh,




I see.
Thanks for your reply.




 
---Original---
From: "Liang-Chi Hsieh"<vi...@gmail.com>
Date: 2017/8/5 17:14:16
To: "dev"<de...@spark.apache.org>;
Subject: Re: the uniqueSource in StreamExecution, where is it be changedplease?



Not sure if you are looking for how the returned value of `getOffset`
changes.

I think it depends on how the actual `Source` classes implement it. For
example, in `FileStreamSource`, you can see `getOffset` is updated by
finding new files in the source.

Different source has different way to get its offset.



萝卜丝炒饭 wrote
> Hi all,
> 
> 
> These days I am learning the code about the StreamExecution.
> In the method constructNextBatch(about line 365), I found the value of
> latestOffsets changed but I can not find where the s.getOffset of
> uniqueSource is  changed.
> here is the code link:
> 
> 
> https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
> 
> 
> 
> Would you like help understand it please?
> 
> 
> Thanks.
> Robin





-----
Liang-Chi Hsieh | @viirya 
Spark Technology Center 
http://www.spark.tc/ 
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