Thanks, Stack. Well, I was able to get the basic hbase cluster to run, but now that I am trying to boost read performance, I am running into stuff that is either not working or I cannot easily find solutions to on the net.
-Avani -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Stack Sent: Tuesday, August 31, 2010 11:52 AM To: [email protected] Subject: Re: HBase table lost on upgrade On Tue, Aug 31, 2010 at 11:36 AM, Sharma, Avani <[email protected]> wrote: > I just upgraded my 3-node cluster for 0.20.3 to 0.20.6. After I did this, I > notice that some of my tables are missing. I recovered the lost tables using > add_table.rb. > > But I am starting to have doubts about the stability of Hbase now since I > have had to recover lost tables a number of times now. What is the possible > reason that the tables could have gone missing? > HBase can lose data if you you run with its defaults which put data into /tmp -- and then your machines are rebooted. HBase can lose data if you crash out your regionservers or kill -9 them -- use one of the 0.89 series releases and hadoop 0.20-append if you want hbase to preserve data across regionserver crashes. You seem to be having a bit of a tough time coming up to speed on hbase going by your recent mails to the list. HBase is not the easiest system to learn. It takes a bit of effort (We're working on making it easier to get going but are not there yet). If you want to take the time to keep track of what you are doing so you can replay it here on the list, we'll help you out. Do take the time to go over the 'getting started' documentation first though. Thanks, St.Ack
