Hi Harsh, Thanks for the update. I will wait for the stable releases of .22 and .23 to test Backup node. Currently I want to check all the namenode failover scenarios and its recovery for Hadoop 1.0.0 version. I tried one conventional way by keeping fsimage and edit log safe using that in case NN is down. What other options I can try for failover recovery test.
Thanks From: Harsh J [mailto:ha...@cloudera.com] Sent: Friday, January 20, 2012 3:54 PM To: hdfs-user@hadoop.apache.org Subject: Re: Query about Backup Node There is no BackupNode on Apache Hadoop 1.x (Rename of 0.20.20x series). The documentation was a mistake, which we've fixed for the next release: https://issues.apache.org/jira/browse/HADOOP-7297 BackupNode was introduced in 0.21, and is available in the 0.22 release today but it has not been tested at scale afaik. Am not sure how many users it has presently. If you are looking for highly available NameNode, its coming via https://issues.apache.org/jira/browse/HDFS-1623 possibly in an update to the 0.23 releases in near future. You can also build the branch http://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-1623/ to test it out. Hope this helps. On 20-Jan-2012, at 3:08 PM, Stuti Awasthi wrote: Hi all, I want to test Backup Node in Hadoop 1.0.0 for my 2 node cluster. Say machine A is master and machine B I want to setup as Backup node. I removed entry from "masters" file so that no SNN is started. I configured both machines similarly just for testing want dfs to be started on machine A and backup started on B. hdfs-site.xml: <property> <name>dfs.backup.address</name> <value>B</value> </property> Slaves File: A Now I format machine A and start dfs : ./hadoop namenode -format ./start-dfs.sh But I am not sure if Backup node is started. I think I am missing something. How to get this working and test Backup node. Thanks ::DISCLAIMER:: ----------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. It shall not attach any liability on the originator or HCL or its affiliates. Any views or opinions presented in this email are solely those of the author and may not necessarily reflect the opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of the author of this e-mail is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any mail and attachments please check them for viruses and defect. ----------------------------------------------------------------------------------------------------------------------- -- Harsh J Customer Ops. Engineer, Cloudera
