Return-Path: X-Original-To: apmail-flink-issues-archive@minotaur.apache.org Delivered-To: apmail-flink-issues-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id B5B20196AB for ; Mon, 11 Apr 2016 09:24:25 +0000 (UTC) Received: (qmail 53441 invoked by uid 500); 11 Apr 2016 09:24:25 -0000 Delivered-To: apmail-flink-issues-archive@flink.apache.org Received: (qmail 53374 invoked by uid 500); 11 Apr 2016 09:24:25 -0000 Mailing-List: contact issues-help@flink.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@flink.apache.org Delivered-To: mailing list issues@flink.apache.org Received: (qmail 53361 invoked by uid 99); 11 Apr 2016 09:24:25 -0000 Received: from arcas.apache.org (HELO arcas) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 11 Apr 2016 09:24:25 +0000 Received: from arcas.apache.org (localhost [127.0.0.1]) by arcas (Postfix) with ESMTP id 822CF2C1F4E for ; Mon, 11 Apr 2016 09:24:25 +0000 (UTC) Date: Mon, 11 Apr 2016 09:24:25 +0000 (UTC) From: "ASF GitHub Bot (JIRA)" To: issues@flink.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (FLINK-3428) Add fixed time trailing timestamp/watermark extractor MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/FLINK-3428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234785#comment-15234785 ] ASF GitHub Bot commented on FLINK-3428: --------------------------------------- Github user kl0u commented on the pull request: https://github.com/apache/flink/pull/1764#issuecomment-208247654 Could somebody review this? > Add fixed time trailing timestamp/watermark extractor > ----------------------------------------------------- > > Key: FLINK-3428 > URL: https://issues.apache.org/jira/browse/FLINK-3428 > Project: Flink > Issue Type: Improvement > Reporter: Robert Metzger > Assignee: Kostas Kloudas > > Flink currently provides only one build-in timestamp extractor, which assumes strictly ascending timestamps. In real world use cases, timestamps are almost never strictly ascending. > Therefore, I propose to provide an utility watermark extractor which is generating watermarks with a fixed-time trailing. > The implementation should keep track of the highest event-time seen so far and subtract a fixed amount of time from that event time. > This way, users can for example specify that the watermarks should always "lag behind" 10 minutes. -- This message was sent by Atlassian JIRA (v6.3.4#6332)