Return-Path: X-Original-To: archive-asf-public-internal@cust-asf2.ponee.io Delivered-To: archive-asf-public-internal@cust-asf2.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by cust-asf2.ponee.io (Postfix) with ESMTP id DFA89200C27 for ; Sun, 12 Feb 2017 06:45:46 +0100 (CET) Received: by cust-asf.ponee.io (Postfix) id DDFE7160B5D; Sun, 12 Feb 2017 05:45:46 +0000 (UTC) Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by cust-asf.ponee.io (Postfix) with SMTP id 335D8160B5B for ; Sun, 12 Feb 2017 06:45:46 +0100 (CET) Received: (qmail 74040 invoked by uid 500); 12 Feb 2017 05:45:45 -0000 Mailing-List: contact commits-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@cassandra.apache.org Delivered-To: mailing list commits@cassandra.apache.org Received: (qmail 74029 invoked by uid 99); 12 Feb 2017 05:45:44 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd1-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 12 Feb 2017 05:45:44 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd1-us-west.apache.org (ASF Mail Server at spamd1-us-west.apache.org) with ESMTP id 43977C1549 for ; Sun, 12 Feb 2017 05:45:44 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd1-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=6.31 tests=[KAM_LAZY_DOMAIN_SECURITY=1, RP_MATCHES_RCVD=-2.999] autolearn=disabled Received: from mx1-lw-us.apache.org ([10.40.0.8]) by localhost (spamd1-us-west.apache.org [10.40.0.7]) (amavisd-new, port 10024) with ESMTP id G9N3akaQTsbH for ; Sun, 12 Feb 2017 05:45:43 +0000 (UTC) Received: from mailrelay1-us-west.apache.org (mailrelay1-us-west.apache.org [209.188.14.139]) by mx1-lw-us.apache.org (ASF Mail Server at mx1-lw-us.apache.org) with ESMTP id 6E94D5FB9A for ; Sun, 12 Feb 2017 05:45:43 +0000 (UTC) Received: from jira-lw-us.apache.org (unknown [207.244.88.139]) by mailrelay1-us-west.apache.org (ASF Mail Server at mailrelay1-us-west.apache.org) with ESMTP id B80BBE04B5 for ; Sun, 12 Feb 2017 05:45:42 +0000 (UTC) Received: from jira-lw-us.apache.org (localhost [127.0.0.1]) by jira-lw-us.apache.org (ASF Mail Server at jira-lw-us.apache.org) with ESMTP id C0D5A21D68 for ; Sun, 12 Feb 2017 05:45:41 +0000 (UTC) Date: Sun, 12 Feb 2017 05:45:41 +0000 (UTC) From: "Chris Lohfink (JIRA)" To: commits@cassandra.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (CASSANDRA-12876) Negative mean write latency MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 archived-at: Sun, 12 Feb 2017 05:45:47 -0000 [ https://issues.apache.org/jira/browse/CASSANDRA-12876?page=3Dcom.atla= ssian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId= =3D15862660#comment-15862660 ]=20 Chris Lohfink commented on CASSANDRA-12876: ------------------------------------------- +1 from me, could reproduce the negative means before and couldn't afterwar= ds. > Negative mean write latency > --------------------------- > > Key: CASSANDRA-12876 > URL: https://issues.apache.org/jira/browse/CASSANDRA-1287= 6 > Project: Cassandra > Issue Type: Bug > Components: Observability > Reporter: K=C3=A9vin LOVATO > Assignee: Per Otterstr=C3=B6m > Fix For: 2.2.x, 3.0.x, 3.11.x, 4.x > > Attachments: 12876-2.2.txt, 12876-2.2-v2.txt, negative_mean_detai= ls.PNG, negative_mean_periodicity.PNG, negative_mean.png, negative_mean_rea= d_latency.png > > > The mean write latency returned by JMX turns negative every 30 minutes. A= s the attached screenshots show, the value turns negative every 30 minutes = after the startup of the node. > We did not experience this behavior in 2.1.16. -- This message was sent by Atlassian JIRA (v6.3.15#6346)