Return-Path: Delivered-To: apmail-hadoop-common-user-archive@www.apache.org Received: (qmail 64572 invoked from network); 9 Dec 2010 06:44:39 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 9 Dec 2010 06:44:39 -0000 Received: (qmail 77338 invoked by uid 500); 9 Dec 2010 06:44:36 -0000 Delivered-To: apmail-hadoop-common-user-archive@hadoop.apache.org Received: (qmail 77216 invoked by uid 500); 9 Dec 2010 06:44:36 -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 76815 invoked by uid 99); 9 Dec 2010 06:44:35 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 09 Dec 2010 06:44:35 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=10.0 tests=RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [209.85.214.182] (HELO mail-iw0-f182.google.com) (209.85.214.182) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 09 Dec 2010 06:44:28 +0000 Received: by iwn39 with SMTP id 39so3193875iwn.41 for ; Wed, 08 Dec 2010 22:44:06 -0800 (PST) Received: by 10.231.36.197 with SMTP id u5mr126680ibd.93.1291877046859; Wed, 08 Dec 2010 22:44:06 -0800 (PST) MIME-Version: 1.0 Received: by 10.231.154.18 with HTTP; Wed, 8 Dec 2010 22:43:46 -0800 (PST) In-Reply-To: References: From: Todd Lipcon Date: Wed, 8 Dec 2010 22:43:46 -0800 Message-ID: Subject: Re: Running not as "hadoop" user To: common-user@hadoop.apache.org Content-Type: text/plain; charset=ISO-8859-1 X-Virus-Checked: Checked by ClamAV on apache.org The user who started the NN has superuser privileges on HDFS. You can also configure a supergroup by setting dfs.permissions.supergroup (default "supergroup") -Todd On Wed, Dec 8, 2010 at 9:34 PM, Mark Kerzner wrote: > Hi, > > "hadoop" user has some advantages for running Hadoop. For example, if HDFS > is mounted as a local file system, then only user "hadoop" has write/delete > permissions. > > Can this privilege be given to another user? In other words, is this > "hadoop" user hard-coded, or can another be used in its stead? > > Thank you, > Mark > -- Todd Lipcon Software Engineer, Cloudera