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 3CD1482C0 for ; Thu, 15 Sep 2011 08:10:49 +0000 (UTC) Received: (qmail 49503 invoked by uid 500); 15 Sep 2011 08:10:44 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 49446 invoked by uid 500); 15 Sep 2011 08:10:44 -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 49378 invoked by uid 99); 15 Sep 2011 08:10:44 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 15 Sep 2011 08:10:44 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=5.0 tests=RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [209.85.212.47] (HELO mail-vw0-f47.google.com) (209.85.212.47) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 15 Sep 2011 08:10:35 +0000 Received: by vwe42 with SMTP id 42so3851094vwe.34 for ; Thu, 15 Sep 2011 01:10:13 -0700 (PDT) MIME-Version: 1.0 Received: by 10.52.28.206 with SMTP id d14mr621626vdh.498.1316074213825; Thu, 15 Sep 2011 01:10:13 -0700 (PDT) Sender: scode@scode.org Received: by 10.52.164.193 with HTTP; Thu, 15 Sep 2011 01:10:13 -0700 (PDT) X-Originating-IP: [94.234.170.52] In-Reply-To: References: Date: Thu, 15 Sep 2011 10:10:13 +0200 X-Google-Sender-Auth: dcg55YvwyDHSXg0F9NmORIigIGY Message-ID: Subject: Re: how did hprof file generated? From: Peter Schuller To: user@cassandra.apache.org Cc: cassandra-user@incubator.apache.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Virus-Checked: Checked by ClamAV on apache.org > in one of my node, I found many hprof files in the cassandra installation > directory, they are using as much as 200GB disk space. =C2=A0other nodes = didn't > have those files. > turns out that those files are used for memory analyzing, not sure how th= ey > are generated? You're probably getting OutOfMemory exceptions. Cassandra by default runs with -XX:+HeapDumpOnOutOfMemory (or some such, I forget exactly what it's called). If this is the case, you probably need to increase your heap size or adjust Cassandra settings. --=20 / Peter Schuller (@scode on twitter)