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 74FD7200D4C for ; Thu, 30 Nov 2017 21:29:51 +0100 (CET) Received: by cust-asf.ponee.io (Postfix) id 73628160C01; Thu, 30 Nov 2017 20:29:51 +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 BA356160BF6 for ; Thu, 30 Nov 2017 21:29:50 +0100 (CET) Received: (qmail 47489 invoked by uid 500); 30 Nov 2017 20:29:49 -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 47478 invoked by uid 99); 30 Nov 2017 20:29:49 -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; Thu, 30 Nov 2017 20:29:49 +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 73B69C5B19 for ; Thu, 30 Nov 2017 20:29:48 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd1-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: 2.329 X-Spam-Level: ** X-Spam-Status: No, score=2.329 tagged_above=-999 required=6.31 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, HTML_MESSAGE=2, KB_WAM_FROM_NAME_SINGLEWORD=0.2, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001] autolearn=disabled Authentication-Results: spamd1-us-west.apache.org (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 RBA_i_qSztPQ for ; Thu, 30 Nov 2017 20:29:47 +0000 (UTC) Received: from mail-qt0-f172.google.com (mail-qt0-f172.google.com [209.85.216.172]) by mx1-lw-us.apache.org (ASF Mail Server at mx1-lw-us.apache.org) with ESMTPS id A30E15F1BA for ; Thu, 30 Nov 2017 20:29:47 +0000 (UTC) Received: by mail-qt0-f172.google.com with SMTP id 33so10466229qtv.1 for ; Thu, 30 Nov 2017 12:29:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=kjbQH/KKqduGUBpN2mM2C1MaccjoQQzhAVI7iiKGr2o=; b=qabttsPoibY0jAYxUQOmy8xv2rJyggFXcrvf0FCGD1gAJMho+QkGJRLA3d3SKLKIAS 5sYYgpCeWGFMqOF9eyNYJhX9wOGmdYD3pSWUr9xHjgQG5JizjVF7zO7JC10Ev9J6yu+a ZxbSJ2aUw3R2kE69L8u1sPzyo2DCEJPUwLevDyIhFnTMxs0i9XgMfVJFRPsvwQzOXJGc 88R02A4fW934emzeYExve11NPlpC/JnNQBr9j9Xmw5pmSRusGMWoLxhijaDEbAGQ0Hh7 eKUGOFWJpa7iiEPcTsRHL/4NiA308AQsUfmfYHXMNmfqX31h12TBHPlJD3opH9txWGNy 2fTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=kjbQH/KKqduGUBpN2mM2C1MaccjoQQzhAVI7iiKGr2o=; b=RQkrkaLnfd0gGNa+VA13+nU6RT9jJ2OWnfKa6oqp8b9aynEOgCjPuBesQjeNHwoPYj jjz4P3PwD+o0L9Hh9NFUIsK1iL0NWr6jqJAkYBcSQ0kcvR4N5D/FaxvMRXs7ZCeQgRNB MN5Oly+Ud1FQ/2OKm6Ebx+FsxyxKsRKYKWopmAaTBhJ3tuFlOFtIWdkmV2WbCEoLIsqW dNqL1ejr15yH13356cihaMkHPo0Xfj8RpiXT+S6oIJisKb47rn0/keWQoqdr0hn0IY1+ rjLuznD1+/F3FrBnrxM/EVRitamDV8l0FtfiNPWdIXdiZAVFtstjTwb8cezmRDJMATiW x2mQ== X-Gm-Message-State: AKGB3mKLS/hayPO3LZ0eQPkudws+XuXAjfm7+pi0M9J2PkHUnfFPpdE1 1gj/MJcqN0TjxE0GKl0F2kv6nWkhhWrF5Z4nO4A= X-Google-Smtp-Source: AGs4zMb4438AKUYOBlGu6S9wf2C+QHiQxOi8dMyZX/R4iIsZLsJhphPgbHSjSYD1wLT7MRmVvXP8+w2M9bgnLBGXm8k= X-Received: by 10.200.53.139 with SMTP id k11mr5362004qtb.77.1512073787112; Thu, 30 Nov 2017 12:29:47 -0800 (PST) MIME-Version: 1.0 Received: by 10.12.170.90 with HTTP; Thu, 30 Nov 2017 12:29:46 -0800 (PST) From: Pranay akula Date: Thu, 30 Nov 2017 15:29:46 -0500 Message-ID: Subject: Tools to analyze Gc pauses. To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary="001a1140a868f482b8055f391c51" archived-at: Thu, 30 Nov 2017 20:29:51 -0000 --001a1140a868f482b8055f391c51 Content-Type: text/plain; charset="UTF-8" Hi, I am seeing couple of gc pauses on nodes causing issue, in my environment we are using 36 nodes cluster using g1gc garbage collector with heap 24gb, having couple of wide partitions which are around 250 mb, not sure if this is an as issue as heap size is 24 gb. I agree it will not be straight forward to find what might be causing it, i am looking for few pointers to help me, like how to analyze threads and how to understand those memory dumps. i am using apache v2.1 Thanks Pranay. --001a1140a868f482b8055f391c51 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,

I am seeing couple of gc pauses on = nodes causing issue, in my environment we are using 36 nodes cluster using = g1gc garbage collector with heap 24gb, having couple of wide partitions whi= ch are around 250 mb, not sure if this is an as issue=C2=A0 as heap size is= 24 gb.


I agree it will not be stra= ight forward to find what might be causing it, i am looking for few pointer= s to help me, like how to analyze threads and how to understand those memor= y dumps.

i am using apache v2.1


Thanks
Pranay.
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