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From "Eugene Koontz (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2766) cluster may not recover if RS hosting ROOT and META together crashes
Date Tue, 22 Jun 2010 18:11:55 GMT
cluster may not recover if RS hosting ROOT and META together crashes
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                 Key: HBASE-2766
                 URL: https://issues.apache.org/jira/browse/HBASE-2766
             Project: HBase
          Issue Type: Bug
            Reporter: Eugene Koontz
            Assignee: Eugene Koontz


If both -ROOT- and .META. are located on the same regionserver, and that regionserver crashes,
the master is unable to reassign these tables to a new regionserver. 

Andrew writes:
"I ran a webtable scenario up on EC2 using the latest TM-2 and a cluster with 1 ZK, 1 master,
5 slaves, and 1 auxiliary node, using the HBase cluster scripts at  https://tm-files.s3.amazonaws.com/hbase-ec2.tar.bz2.
On the aux node I uploaded the Faulkner utility --  https://tm-files.s3.amazonaws.com/faulkner.tar.gz
 -- and ran the 'webtable.sh' script in that tarball. On the master I waited about 30 minutes
for a fair amount of regions to proliferate and then ran:

    # nice -10 hbase shell
    hbase> count 'TestTable'

and walked away, leaving it to chew on the heavy write load and scan.

At some point during this test scenario a region server crashed, due to a JVM segfault. The
client (Faulkner) never recovered.

As far as I can see, in this test scenario the master never reassigns regions away from a
crashed RS."

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