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Posted to issues@flink.apache.org by kl0u <gi...@git.apache.org> on 2016/03/30 11:45:04 UTC
[GitHub] flink pull request: Adds watermark emission to the Kafka source by...
GitHub user kl0u opened a pull request:
https://github.com/apache/flink/pull/1839
Adds watermark emission to the Kafka source by allowing the user to specify her TimestampExtractor.
This PR allows the user to embed her desired timestampExtractor (or Watermark emitter) in the Kafka source itself, and it makes the source responsible for synchronizing between the different partitions/topics with lagging timestamps.
In more detail, if a task handles two partitions, the first with timestamps of 0 to 100 and the other from 1000 to 2000, if it were to emit a watermark with timestamp equal to the maximum timestamp seen, then as soon as an element from the partition with the 1000 to 2000 timestamps arrives, it would render all elements in the other partition as late. To avoid this, this source will monitor the per partition/topic max timestamps, and emit a watermark with a timestamp equal to the minimum across the max per partition per topic timestamps. The emission will be done in a periodic or a punctuates way, depending on the type of the timestamp extractor the user specified.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kl0u/flink kafka_wm_redesign
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1839.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1839
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commit 74dbb5c81ef7793202f151a96dee2ee0bd980a36
Author: kl0u <kk...@gmail.com>
Date: 2016-03-08T16:35:14Z
Adds watermark emission to the Kafka source by allowing the user to specify her TimestampExtractor.
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[GitHub] flink pull request: Adds watermark emission to the Kafka source by...
Posted by kl0u <gi...@git.apache.org>.
Github user kl0u commented on the pull request:
https://github.com/apache/flink/pull/1839#issuecomment-203354870
This PR is for FLINK-3375.
Please review.
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[GitHub] flink pull request: Adds watermark emission to the Kafka source by...
Posted by asfgit <gi...@git.apache.org>.
Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/1839
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