Return-Path: X-Original-To: apmail-hadoop-mapreduce-user-archive@minotaur.apache.org Delivered-To: apmail-hadoop-mapreduce-user-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 8AD2D17B69 for ; Wed, 2 Sep 2015 16:21:10 +0000 (UTC) Received: (qmail 2714 invoked by uid 500); 2 Sep 2015 16:21:06 -0000 Delivered-To: apmail-hadoop-mapreduce-user-archive@hadoop.apache.org Received: (qmail 2594 invoked by uid 500); 2 Sep 2015 16:21:06 -0000 Mailing-List: contact user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@hadoop.apache.org Delivered-To: mailing list user@hadoop.apache.org Received: (qmail 2584 invoked by uid 99); 2 Sep 2015 16:21:05 -0000 Received: from Unknown (HELO spamd2-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 02 Sep 2015 16:21:05 +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 4DE261AB4D9 for ; Wed, 2 Sep 2015 16:21:05 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd2-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: 2.9 X-Spam-Level: ** X-Spam-Status: No, score=2.9 tagged_above=-999 required=6.31 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=3, 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 09z307QdnAu0 for ; Wed, 2 Sep 2015 16:20:53 +0000 (UTC) Received: from mail-io0-f180.google.com (mail-io0-f180.google.com [209.85.223.180]) by mx1-eu-west.apache.org (ASF Mail Server at mx1-eu-west.apache.org) with ESMTPS id 34AFF24C0E for ; Wed, 2 Sep 2015 16:20:52 +0000 (UTC) Received: by iofb144 with SMTP id b144so26304504iof.1 for ; Wed, 02 Sep 2015 09:20:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=fSCIsKHOH8B+V3oRcsVIHKjwvQ9w8wS31cUtabc3QmE=; b=DNvP0E9/6tM9ASulA3ol5/JQwWkH7vR9XxBluRc60P/ZaYHYtATJ3VGO6rbN8ChqsD Wamau9qqIGsK6baagc5XjmOZOQdHWGGTTrmqt8lwPLHE/3CDVeNwkcesNc3n8GUY/yRy deHVutAOByoUW74s64CgxvUYPEUh8T59M7ZqaiI+3N1y17880lii8r+LARwXtpj79qHI 776ECkNklFpK+ARw1s29kSKAiPWBySN26LrVv+vphuh00RlQPJTFZchF9vTCT3mF5cg1 d1LkmM4+UN6UCD7pY1R5NORCZw5QsWY3g0/JuABCYoQ/IBuAU/JdBdNWspkwCXJsCrrq ZI+Q== MIME-Version: 1.0 X-Received: by 10.107.150.80 with SMTP id y77mr33470760iod.188.1441210850910; Wed, 02 Sep 2015 09:20:50 -0700 (PDT) Received: by 10.36.88.212 with HTTP; Wed, 2 Sep 2015 09:20:50 -0700 (PDT) In-Reply-To: <7AFF456D-B058-497F-B378-D7DA20B93263@icloud.com> References: <7AFF456D-B058-497F-B378-D7DA20B93263@icloud.com> Date: Wed, 2 Sep 2015 09:20:50 -0700 Message-ID: Subject: Re: High iowait in idle hbase cluster From: Ted Yu To: "common-user@hadoop.apache.org" Content-Type: multipart/alternative; boundary=001a1140267ed0ab08051ec60c28 --001a1140267ed0ab08051ec60c28 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Please provide some more information: release of hbase / hadoop you're using were region servers doing compaction ? have you checked region server logs ? Thanks On Wed, Sep 2, 2015 at 9:11 AM, Akmal Abbasov wrote: > Hi, > I=E2=80=99m having strange behaviour in hbase cluster. It is almost idle,= only <5 > puts and gets. > But the data in hdfs is increasing, and region servers have very high > iowait(>100, in 2 core CPU). > iotop shows that datanode process is reading and writing all the time. > Any suggestions? > > Thanks. --001a1140267ed0ab08051ec60c28 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Please provide some more information:

r= elease of hbase / hadoop you're using
were region servers doi= ng compaction ?
have you checked region server logs ?
<= br>
Thanks

On Wed, Sep 2, 2015 at 9:11 AM, Akmal Abbasov <akm= al.abbasov@icloud.com> wrote:
Hi,
I=E2=80=99m having strange behaviour in hbase cluster. It is almost idle, o= nly <5 puts and gets.
But the data in hdfs is increasing, and region servers have very high iowai= t(>100, in 2 core CPU).
iotop shows that datanode process is reading and writing all the time.
Any suggestions?

Thanks.

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