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Date: Tue, 31 Aug 2010 11:51:53 -0700
Message-ID: <AANLkTimKvoYLpDPEiWnhpw_iRU41U5tqBt=RwaQiO4Xu@mail.gmail.com>
Subject: Re: HBase table lost on upgrade
From: Stack <stack@duboce.net>
To: user@hbase.apache.org
Content-Type: text/plain; charset=ISO-8859-1

On Tue, Aug 31, 2010 at 11:36 AM, Sharma, Avani <agsharma@ebay.com> 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