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 5866111874 for ; Mon, 28 Jul 2014 14:15:06 +0000 (UTC) Received: (qmail 57619 invoked by uid 500); 28 Jul 2014 14:14:56 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 57582 invoked by uid 500); 28 Jul 2014 14:14:56 -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 57572 invoked by uid 99); 28 Jul 2014 14:14:56 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 28 Jul 2014 14:14:56 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [209.85.212.177] (HELO mail-wi0-f177.google.com) (209.85.212.177) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 28 Jul 2014 14:14:50 +0000 Received: by mail-wi0-f177.google.com with SMTP id ho1so4444244wib.4 for ; Mon, 28 Jul 2014 07:14:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=t4EAbXPu0nUjBzAY7VAXnORUsa2xNf1RgrZ5sDW+3/0=; b=fZP+niJtDOpflu68FyGL6SM6dT1BlMcemg+gZZ1DgY7jVPgIq2JS/Lvw6V8jqfSvs2 SeHMvdycQ6ta6qcOI/t81K4x7Rl5MjBAA3dL8KW2M+kTRTfOpc4AF2A0O4d2DrSkecF1 PnlBGUHozGzo+Zm3phHXegzGlzr3JklWppr2UHsSf2kwcnyXYVA6L9N4ZrX7zMq2dpC4 zkNCEKCPWm6GGHwbC0fmEFoyN6uelE6qXhAde4IET9zCGYaek0aCWsYj1DDjHQTf78gd YiCSclqkQ0PViL94kFmEYmLWyQKG84g9g4TWM0D2pFYvgLEGlYf99jNZSlfiadROsDCm 7w1Q== X-Gm-Message-State: ALoCoQnI1/qJdIk2xdGzn+CGnrAGZ8SNK8XdnNAXVr5iN3Tocm1x0xrMj1vPaXZ1GdSUzb60xLba MIME-Version: 1.0 X-Received: by 10.180.19.1 with SMTP id a1mr32168318wie.16.1406556868561; Mon, 28 Jul 2014 07:14:28 -0700 (PDT) Received: by 10.194.55.135 with HTTP; Mon, 28 Jul 2014 07:14:28 -0700 (PDT) X-Originating-IP: [89.101.207.179] In-Reply-To: References: Date: Mon, 28 Jul 2014 15:14:28 +0100 Message-ID: Subject: Re: Full GC in cassandra From: Mark Reddy To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=bcaec53d5e0581ecfe04ff418a02 X-Virus-Checked: Checked by ClamAV on apache.org --bcaec53d5e0581ecfe04ff418a02 Content-Type: text/plain; charset=UTF-8 What is your data size and number of columns in Cassandra. Do you do many deletions? On Mon, Jul 28, 2014 at 2:53 PM, Ruchir Jha wrote: > Really curious to know what's causing the spike in Columns and > DeletedColums below : > > > 2014-07-28T09:30:27.471-0400: 127335.928: [Full GC 127335.928: [Class > Histogram: > num #instances #bytes class name > ---------------------------------------------- > 1: 132626060 6366050880 java.nio.HeapByteBuffer > 2: 28194918 3920045528 [B > 3: 78124737 3749987376 > edu.stanford.ppl.concurrent.SnapTreeMap$Node > * 4: 67650128 2164804096 > <2164804096> org.apache.cassandra.db.Column* > * 5: 16315310 522089920 org.apache.cassandra.db.DeletedColumn* > 6: 6818 392489608 [I > 7: 2844374 273059904 > edu.stanford.ppl.concurrent.CopyOnWriteManager$COWEpoch > 8: 5727000 229080000 java.util.TreeMap$Entry > 9: 767742 182921376 [J > 10: 2932832 140775936 > edu.stanford.ppl.concurrent.SnapTreeMap$RootHolder > 11: 2844375 91020000 > edu.stanford.ppl.concurrent.CopyOnWriteManager$Latch > 12: 4145131 66322096 > java.util.concurrent.atomic.AtomicReference > 13: 437874 64072392 [C > 14: 2660844 63860256 > java.util.concurrent.ConcurrentSkipListMap$Node > 15: 4920 62849864 [[B > 16: 1632063 52226016 edu.stanford.ppl.concurrent.SnapTreeMap > --bcaec53d5e0581ecfe04ff418a02 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
What is your data size and number of columns in Cassandra.= Do you do many deletions?


On Mon, Jul 28, 2014 at 2:53 PM, Ruchir Jha <ruchir.= jha@gmail.com> wrote:
Really curious to know what's causing t= he spike in Columns and DeletedColums below :


2014-07-28T0= 9:30:27.471-0400: 127335.928: [Full GC 127335.928: [Class Histogram:
=C2=A0num =C2=A0 =C2=A0 #instances =C2=A0 =C2=A0 =C2=A0 =C2=A0 #bytes =C2= =A0class name
----------------------------------------------
=C2=A0 =C2=A01: =C2=A0 =C2=A0 132626= 060 =C2=A0 =C2=A0=C2=A06366050880=C2=A0=C2=A0java.nio.HeapByteBuffer
=C2=A0 =C2=A02: = =C2=A0 =C2=A0 =C2=A028194918 =C2=A0 =C2=A0 3920045528 =C2=A0[B
=C2=A0 =C2=A03: =C2=A0 = =C2=A0 =C2=A078124737 =C2=A0 =C2=A0 3749987376 =C2=A0edu.stanford.ppl.concu= rrent.SnapTreeMap$Node
=C2=A0 =C2=A0= 4: =C2=A0 =C2=A0 =C2=A067650128 =C2=A0 =C2=A0=C2=A02164804096=C2=A0=C2=A0org.a= pache.cassandra.db.Column
=C2=A0 =C2=A05: =C2=A0 =C2=A0 =C2=A016315310 =C2=A0 =C2=A0 =C2=A05220899= 20 =C2=A0org.apache.cassandra.db.DeletedColumn
=C2=A0 =C2=A06: =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A06818 =C2=A0 =C2=A0 =C2=A0392489608 =C2=A0[I
=C2=A0 =C2=A07: =C2=A0 =C2=A0 =C2=A0 2844374 =C2=A0 =C2=A0 =C2=A0273059904 = =C2=A0edu.stanford.ppl.concurrent.CopyOnWriteManager$COWEpoch
=C2=A0 =C2=A08: =C2=A0 = =C2=A0 =C2=A0 5727000 =C2=A0 =C2=A0 =C2=A0229080000 =C2=A0java.util.TreeMap= $Entry
=C2=A0 =C2=A09: =C2=A0 =C2=A0 =C2=A0 =C2=A0767742 =C2=A0 =C2=A0 =C2=A018292= 1376 =C2=A0[J
=C2=A0 10: =C2=A0 =C2=A0 =C2=A0 2932832 =C2=A0 =C2=A0 =C2=A0140775936 = =C2=A0edu.stanford.ppl.concurrent.SnapTreeMap$RootHolder
=C2=A0 11: =C2=A0 =C2=A0 =C2=A0 2844375 =C2=A0 =C2=A0 =C2=A0 91020000 =C2= =A0edu.stanford.ppl.concurrent.CopyOnWriteManager$Latch
=C2=A0 12: =C2=A0 =C2=A0 =C2= =A0 4145131 =C2=A0 =C2=A0 =C2=A0 66322096 =C2=A0java.util.concurrent.atomic= .AtomicReference
=C2=A0 13: =C2= =A0 =C2=A0 =C2=A0 =C2=A0437874 =C2=A0 =C2=A0 =C2=A0 64072392 =C2=A0[C
=
=C2=A0 14: =C2= =A0 =C2=A0 =C2=A0 2660844 =C2=A0 =C2=A0 =C2=A0 63860256 =C2=A0java.util.con= current.ConcurrentSkipListMap$Node
=C2=A0 15: =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A04920 =C2=A0 =C2=A0 =C2=A0 62849864 =C2=A0[[B=
=C2=A0 16:= =C2=A0 =C2=A0 =C2=A0 1632063 =C2=A0 =C2=A0 =C2=A0 52226016 =C2=A0edu.stanf= ord.ppl.concurrent.SnapTreeMap

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