Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 50A00185A8 for ; Sun, 25 Oct 2015 10:17:37 +0000 (UTC) Received: (qmail 97353 invoked by uid 500); 25 Oct 2015 10:17:33 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 97311 invoked by uid 500); 25 Oct 2015 10:17:33 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 97301 invoked by uid 99); 25 Oct 2015 10:17:33 -0000 Received: from Unknown (HELO spamd2-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 25 Oct 2015 10:17:33 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd2-us-west.apache.org (ASF Mail Server at spamd2-us-west.apache.org) with ESMTP id 43EF31A2749 for ; Sun, 25 Oct 2015 10:17:33 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd2-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: 2.88 X-Spam-Level: ** X-Spam-Status: No, score=2.88 tagged_above=-999 required=6.31 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=disabled Authentication-Results: spamd2-us-west.apache.org (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mx1-eu-west.apache.org ([10.40.0.8]) by localhost (spamd2-us-west.apache.org [10.40.0.9]) (amavisd-new, port 10024) with ESMTP id qrcJuR1FvPVA for ; Sun, 25 Oct 2015 10:17:26 +0000 (UTC) Received: from mail-vk0-f42.google.com (mail-vk0-f42.google.com [209.85.213.42]) by mx1-eu-west.apache.org (ASF Mail Server at mx1-eu-west.apache.org) with ESMTPS id F197620924 for ; Sun, 25 Oct 2015 10:17:25 +0000 (UTC) Received: by vkgs66 with SMTP id s66so23768842vkg.1 for ; Sun, 25 Oct 2015 03:17:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=agfFVSlbPH8fMYIx28jH0c3PyvaIGaWaI9jI8/HPYSQ=; b=oEe6vc82/QAtjN6vLbPq/50GHKxh4QdvGDhjYEOnOTBHyLach1PPz4n6OCLhP2MdzI vbIgxQIsMmCf84ncwWXOymviSt27Tc69kfG2z2OLHKkKAsxVfK+D4Iuv/9va6ychhcVG 8Gm7CtvRnyaVjGewIE1bcazXFoTW6sElya/Q+B/qbmMp2cjeY+OGMUqTFQh0ts0wSjhb ejeqL+7kfysYCXAuov7RQ64YYhJuy11SE8L/ykXk/CoqMO9ZNaS9td+Slh5Nx0G1j1GP d04xtHeXEiclDw/PEtR9/eEo5gvPETK9/zV008OdG7besRs37zKSVAYa/KmHTIt7/g9t AMdg== X-Received: by 10.31.134.193 with SMTP id i184mr19647418vkd.64.1445768244784; Sun, 25 Oct 2015 03:17:24 -0700 (PDT) MIME-Version: 1.0 Received: by 10.31.58.199 with HTTP; Sun, 25 Oct 2015 03:17:05 -0700 (PDT) In-Reply-To: References: From: =?UTF-8?B?5pu55b+X5a+M?= Date: Sun, 25 Oct 2015 18:17:05 +0800 Message-ID: Subject: Re: terrible read/write latency fluctuation To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=001a114115e6a8748b0522eb26d9 --001a114115e6a8748b0522eb26d9 Content-Type: text/plain; charset=UTF-8 I will try to trace a read that take > 20msec . just HDD.no delete just 60days ttl.value size is small ,max length is 140. My data like Time Series . date of 90% reads which timestamp < 7days. data almost just insert ,with a lit update. --001a114115e6a8748b0522eb26d9 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
I will try to trace a read that take > 20msec
.

just HDD.no delete just 60days ttl.value size is smal= l ,max length is 140.


My data like = Time Series=C2=A0. date of 90% reads whi= ch timestamp < 7days. data almost just insert ,with a lit update.=
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