Return-Path: Delivered-To: apmail-hadoop-common-user-archive@www.apache.org Received: (qmail 58357 invoked from network); 14 Mar 2010 07:51:41 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 14 Mar 2010 07:51:41 -0000 Received: (qmail 21515 invoked by uid 500); 14 Mar 2010 07:50:56 -0000 Delivered-To: apmail-hadoop-common-user-archive@hadoop.apache.org Received: (qmail 21327 invoked by uid 500); 14 Mar 2010 07:50:56 -0000 Mailing-List: contact common-user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: common-user@hadoop.apache.org Delivered-To: mailing list common-user@hadoop.apache.org Received: (qmail 21319 invoked by uid 99); 14 Mar 2010 07:50:55 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 14 Mar 2010 07:50:55 +0000 X-ASF-Spam-Status: No, hits=0.0 required=10.0 tests=FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of saptarshi.guha@gmail.com designates 209.85.220.221 as permitted sender) Received: from [209.85.220.221] (HELO mail-fx0-f221.google.com) (209.85.220.221) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 14 Mar 2010 07:50:47 +0000 Received: by fxm21 with SMTP id 21so708006fxm.11 for ; Sat, 13 Mar 2010 23:50:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:reply-to:from:date :message-id:subject:to:content-type; bh=pdVrnEo6PJBWnLFJCcV25qBkERESESexje4Rzh9Qn8g=; b=WExs9dr4PpfSEw9XkZ7PApvNO+TEZoKpmV/QVFKpqa86902pYgUra+HduVNN6Qw7zP VFV2knvIBdpAjlv/SXasVGif2DCa9BlTg6ReTvxQkMP+bWQAsEy1ZQhJpDXOT8mvIFQw D0RabPhoooI2ScTprwO7dTM83MOGPFnlUaLkM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:reply-to:from:date:message-id:subject:to:content-type; b=pEwwFYDNZvxwEcornqtYpsSZQ/VRteGoXv7l8VXY35wgXP8n5e364Ue1ErcIOrNnPq VoePwwuNDoGUE3qEy5124fDgXW7UdmgQ6iZO/NO9TM6NACOtWcTGA8DEeARmh6xAtykm dSyUMB+/S8/ZLWwOGzs6/Oh7tX6d6T7pBlaLM= MIME-Version: 1.0 Received: by 10.239.190.76 with SMTP id w12mr722286hbh.211.1268553027163; Sat, 13 Mar 2010 23:50:27 -0800 (PST) Reply-To: saptarshi.guha@gmail.com From: Saptarshi Guha Date: Sun, 14 Mar 2010 02:50:07 -0500 Message-ID: <1e7471d51003132350m77567b02g273808ef001d487@mail.gmail.com> Subject: Class hook for Tasktracker JVM start/stop To: common-user@hadoop.apache.org Content-Type: text/plain; charset=UTF-8 X-Virus-Checked: Checked by ClamAV on apache.org Hello, The value mapred.job.reuse.jvm.num.tasks is the number of tasks a Tasktracker will process before it shuts down and another Tasktracker starts, correct? If so, is there a hook/class that can be called when the jvm(corresponding to the TaskTracker) starts and one when it shuts down? Can this class be provided with the Cofiguration/context object? Much thanks Saptarshi