Re: Setting up another machine as secondary node

-user@hadoop.apache.org Subject: Re: Setting up another machine as secondary node Hey Koji, It's an expensive operation - for the secondary namenode, not the namenode itself, right? I don't particularly care if I stress out a dedicated node that doesn't have to respond to queries ;) Locally we

Re: Setting up another machine as secondary node

, May 14, 2009 10:32 AM To: core-user@hadoop.apache.org Subject: Re: Setting up another machine as secondary node Hey Koji, It's an expensive operation - for the secondary namenode, not the namenode itself, right? I don't particularly care if I stress out a dedicated node that doesn't have to respond

Re: Setting up another machine as secondary node

...@cse.unl.edu] Sent: Thursday, May 14, 2009 10:32 AM To: core-user@hadoop.apache.org Subject: Re: Setting up another machine as secondary node Hey Koji, It's an expensive operation - for the secondary namenode, not the namenode itself, right? I don't particularly care if I stress out

Re: Setting up another machine as secondary node

help after 0.19 or later. Koji -Original Message- From: Brian Bockelman [mailto:bbock...@cse.unl.edu] Sent: Thursday, May 14, 2009 10:32 AM To: core-user@hadoop.apache.org Subject: Re: Setting up another machine as secondary node Hey Koji, It's an expensive operation - for the secondary

Re: Setting up another machine as secondary node

Message- From: Brian Bockelman [mailto:bbock...@cse.unl.edu] Sent: Thursday, May 14, 2009 10:32 AM To: core-user@hadoop.apache.org Subject: Re: Setting up another machine as secondary node Hey Koji, It's an expensive operation - for the secondary namenode, not the namenode itself, right

Re: Setting up another machine as secondary node

First of all, the secondary namenode is not a what you might think a secondary is - it's not failover device. It does make a copy of the filesystem metadata periodically, and it integrates the edits into the image. It does *not* provide failover. Second, you specify its IP address in

Re: Setting up another machine as secondary node

any machine put in the conf/masters file becomes a secondary namenode. At some point there was confusion on the safety of more than one machine, which I believe was settled, as many are safe. The secondary namenode takes a snapshot at 5 minute (configurable) intervals, rebuilds the fsimage and

RE: Setting up another machine as secondary node

[mailto:jason.had...@gmail.com] Sent: Thursday, May 14, 2009 7:46 AM To: core-user@hadoop.apache.org Subject: Re: Setting up another machine as secondary node any machine put in the conf/masters file becomes a secondary namenode. At some point there was confusion on the safety of more than one machine, which I

Re: Setting up another machine as secondary node

or even every day. Isn't the default 3600 seconds? Koji -Original Message- From: jason hadoop [mailto:jason.had...@gmail.com] Sent: Thursday, May 14, 2009 7:46 AM To: core-user@hadoop.apache.org Subject: Re: Setting up another machine as secondary node any machine put in the conf/masters

RE: Setting up another machine as secondary node

0.19 or later. Koji -Original Message- From: Brian Bockelman [mailto:bbock...@cse.unl.edu] Sent: Thursday, May 14, 2009 10:32 AM To: core-user@hadoop.apache.org Subject: Re: Setting up another machine as secondary node Hey Koji, It's an expensive operation - for the secondary namenode