Return-Path: X-Original-To: apmail-hadoop-common-commits-archive@www.apache.org Delivered-To: apmail-hadoop-common-commits-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 341DC6EE1 for ; Thu, 16 Jun 2011 17:56:23 +0000 (UTC) Received: (qmail 93661 invoked by uid 500); 16 Jun 2011 17:56:23 -0000 Delivered-To: apmail-hadoop-common-commits-archive@hadoop.apache.org Received: (qmail 93632 invoked by uid 500); 16 Jun 2011 17:56:22 -0000 Mailing-List: contact common-commits-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: common-dev@hadoop.apache.org Delivered-To: mailing list common-commits@hadoop.apache.org Received: (qmail 93625 invoked by uid 500); 16 Jun 2011 17:56:22 -0000 Delivered-To: apmail-hadoop-core-commits@hadoop.apache.org Received: (qmail 93622 invoked by uid 99); 16 Jun 2011 17:56:22 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 16 Jun 2011 17:56:22 +0000 X-ASF-Spam-Status: No, hits=-2000.0 required=5.0 tests=ALL_TRUSTED X-Spam-Check-By: apache.org Received: from [140.211.11.131] (HELO eos.apache.org) (140.211.11.131) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 16 Jun 2011 17:56:21 +0000 Received: from eos.apache.org (localhost [127.0.0.1]) by eos.apache.org (Postfix) with ESMTP id B1940359; Thu, 16 Jun 2011 17:56:01 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Apache Wiki To: Apache Wiki Date: Thu, 16 Jun 2011 17:56:01 -0000 Message-ID: <20110616175601.43483.41455@eos.apache.org> Subject: =?utf-8?q?=5BHadoop_Wiki=5D_Trivial_Update_of_=22FAQ=22_by_QwertyManiac?= Auto-Submitted: auto-generated Dear Wiki user, You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for ch= ange notification. The "FAQ" page has been changed by QwertyManiac: http://wiki.apache.org/hadoop/FAQ?action=3Ddiff&rev1=3D104&rev2=3D105 1. Restart the HDFS = =3D=3D What does "file could only be replicated to 0 nodes, instead of 1"= mean? =3D=3D - The NameNode does not have any available !DataNodes. This can be caused = by a wide variety of reasons. Check the DataNode logs, the NameNode logs, = network connectivity, ... + The NameNode does not have any available !DataNodes. This can be caused = by a wide variety of reasons. Check the DataNode logs, the NameNode logs, = network connectivity, ... Please see the page: CouldOnlyBeReplicatedTo = =3D=3D If the NameNode loses its only copy of the fsimage file, can the f= ile system be recovered from the DataNodes? =3D=3D No. This is why it is very important to configure [[http://hadoop.apache= .org/hdfs/docs/current/hdfs-default.html#dfs.namenode.name.dir|dfs.namenode= .name.dir]] to write to two filesystems on different physical hosts, use th= e SecondaryNameNode, etc.