How do I recover the namenode?

cluster is.. 2 namenodes ( ha cluster ), 3 jounalnodes, n datanodes I regularly back up the metadata(fsimage) file. ( http://[namenode address]:50070/imagetransfer?getimage=1amp;txid=latest ) How do I recover the namenode by using the metadata(fsimage)?

Re: heartbeat timeout doesn't work

The timeout value is set by the following formula: heartbeatExpireInterval = 2 * (heartbeatRecheckInterval) + 10 * 1000 * (heartbeatIntervalSeconds); Note that heartbeatRecheckInterval is set by dfs.namenode.heartbeat.recheck-interval property (5*60*1000 [msec] by

Re: define node

A server with more than one hard drive is one node only. Sam On 7/7/14, 9:50 AM, Adaryl Bob Wakefield, MBA adaryl.wakefi...@hotmail.com wrote: If you have a server with more than one hard drive is that one node or n nodes where n = the number of hard drives? B.

Managed File Transfer

Hi, We used a commercial FT and scheduler tool in clustered mode. This was a traditional active-active cluster that supported multiple protocols like FTPS etc. Now I am interested in evaluating a Distributed way of crawling FTP sites and downloading files using Hadoop. I thought

Re: How do I recover the namenode?

please follow along the steps • Shutdown all Hadoop daemons on all servers in the cluster. • Copy NameNode metadata onto the secondary NameNode and copy the entire directory tree to the secondary NameNode. • Modify the core-site.xml file, making the secondary NameNode server the new NameNode

Re: Significance of PID files

When a daemon process is started, the process ID of the process is captured in a pid file. It is used for following purposes: - During a daemon startup, the existence of pid file is used to determine that the process is already running. - When a daemon is stooped, hadoop scripts sends kill TERM

Re: Huge text file for Hadoop Mapreduce

http://www.cs.cmu.edu/~./enron/ Not sure the uncompressed size but pretty sure it’s over a Gig. B. From: navaz Sent: Monday, July 07, 2014 6:22 PM To: user@hadoop.apache.org Subject: Huge text file for Hadoop Mapreduce Hi I am running basic word count Mapreduce code. I have download a

Re: How do I recover the namenode?

Thank you for answer. However, my Hadoop version is 2.4.1. Cluster does not have secondary namenode . How do I recover the namenode( hadoop version 2.4.1 ) by using the metadata(fsimage) ? -Original Message- From: Raj K Singhlt;rajkrrsi...@gmail.comgt; To:

Copy hdfs block from one data node to another

Hi All, How can copy a certain hdfs block (given the file name, start and end bytes) from one node to another node ? Thanks Yehia

Re: Copy hdfs block from one data node to another

Can you outline why one would want to do that? The blocks are disposable so it is strange to manipulate them directly. On Jul 7, 2014 8:16 PM, Yehia Elshater y.z.elsha...@gmail.com wrote: Hi All, How can copy a certain hdfs block (given the file name, start and end bytes) from one node to

can i monitor all hadoop component from one box?

hi,maillist: i want to check all hadoop cluster component process is alive or die ,i do not know if it can do like check zookeeper node from one machine?thanks

Re: can i monitor all hadoop component from one box?

look at nagios or ganglia for monitoring. On Tue, Jul 8, 2014 at 8:16 AM, ch huang justlo...@gmail.com wrote: hi,maillist: i want to check all hadoop cluster component process is alive or die ,i do not know if it can do like check zookeeper node from one machine?thanks -- Nitin

Re: Huge text file for Hadoop Mapreduce

Configuration conf = getConf(); conf.setLong(mapreduce.input.fileinputformat.split.maxsize,1000); // u can set this to some small value (in bytes) to ensure your file will split to multiple mappers , provided the format is not un-splitable format like .snappy. On Tue, Jul 8, 2014 at 7:32