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From Patrick Raeuber <patrick.raeu...@semgine.com>
Subject Re: META table location
Date Tue, 06 May 2008 08:06:51 GMT
stack wrote:
> Patrick Raeuber wrote:
>> Hi everybody !
>>
>> I'd kindly ask you for support at two problems.
>>
>> a) Is it possible to restore tables from the hbase filesystem (local 
>> and hdfs) ?
>>
>> I tried 'hbase migrate' but as it seems it requires a local copy of 
>> the hbase root dir ('hdfs://...' required : 'file:///').
> 
> There was a bug in our Migrate tool (HBASE-590).  Its will be fixed in 
> the 0.1.2 release (A 0.1.2 release candidate was put up a few weeks 
> back.  A new candidate should go up today or tomorrow).

Ok!

> 
> 
>>
>> b) Can you specify the location of the .META. directory?
>>
>> It seems as if hbase by itself chooses the region server to store the 
>> .META. table at. I used the local file system with only ONE region 
>> server configured. Then, I stopped the hbase master, increased the 
>> number of region servers, restarted the hbase master and the 
>> previously generated tables where gone. On the web interface I saw 
>> that hbase had chosen another region server for the meta directory.
>>
>> Any suggestions? 
> Thats correct (that the master decides where the .META. goes).  Were the 
> regionservers running on the same system as the master: i.e. were they 
> sharing the same local fileystem?   Otherwise, you need to use hdfs.  
> Master and regionservers all need to be sharing the same filesystem.

No, the regionservers used their own seperate filesystems. That seems to 
be the problem. We'll try a shared filesystem.

Thank you very much and have a nice day!

> 
> St.Ack
> 
> 


-- 
Patrick Räuber
Software Developer
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mail  patrick.raeuber@semgine.com
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