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From "Kirill Balyasnikov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1724) Data loss after `kill -9` region server
Date Thu, 30 Jul 2009 12:13:14 GMT
Data loss after `kill -9` region server
---------------------------------------

                 Key: HBASE-1724
                 URL: https://issues.apache.org/jira/browse/HBASE-1724
             Project: Hadoop HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.19.3
         Environment: OpenSUSE 11.1, HBase 0.19.3, Hadoop HDFS 0.19.1
            Reporter: Kirill Balyasnikov


I have a 3 node cluster setup each running hadoop and hbase. I have created 'accounts' table
and loaded some data into it (about 3000 rows).
Some days later one of the region servers died and after i restarted it there were no records
in the table at all. I saw HLOG file with my records
in HDFS but as I understand the file was not used by HBase to recover the table.

I tried to emulate the situation and uploaded another 2000 records into my table and killed
the region server holding 'accounts' table region.
In the HDFS I found file with my records but some time later it was replaced by another empty
directory. As i suspected after killed region 
server startup the data was not recovered.

Everything is lost again and there is no any exceptions in the logs...

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