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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6461) Killing the HRegionServer and DataNode hosting ROOT can result in a malformed root table.
Date Thu, 26 Jul 2012 20:13:35 GMT
Elliott Clark created HBASE-6461:

             Summary: Killing the HRegionServer and DataNode hosting ROOT can result in a
malformed root table.
                 Key: HBASE-6461
                 URL: https://issues.apache.org/jira/browse/HBASE-6461
             Project: HBase
          Issue Type: Bug
         Environment: hadoop-0.20.2-cdh3u3
HBase 0.94.1 RC1
            Reporter: Elliott Clark

Spun up a new dfs on hadoop-0.20.2-cdh3u3
Started hbase
started running loadtest tool.
killed rs and dn holding root with killall -9 java on server sv4r27s44 at about 2012-07-25

After things stabilize Root is in a bad state. Ran hbck and got:
Exception in thread "main" org.apache.hadoop.hbase.client.NoServerForRegionException: No server
address listed in -ROOT- for region .META.,,1.1028785192 containing row 
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:1016)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:841)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:810)
at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:232)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:172)
at org.apache.hadoop.hbase.util.HBaseFsck.connect(HBaseFsck.java:241)
at org.apache.hadoop.hbase.util.HBaseFsck.main(HBaseFsck.java:3236)

hbase(main):001:0> scan '-ROOT-'
ROW                                           COLUMN+CELL                                
12/07/25 22:43:18 INFO security.UserGroupInformation: JAAS Configuration already set up for
Hadoop, not re-installing.
 .META.,,1                                    column=info:regioninfo, timestamp=1343255838525,
value={NAME => '.META.,,1', STARTKEY => '', ENDKEY => '', ENCODED => 1028785192,}
 .META.,,1                                    column=info:v, timestamp=1343255838525, value=\x00\x00
1 row(s) in 0.5930 seconds

Here's the master log: https://gist.github.com/3179194

I tried the same thing with 0.92.1 and I was able to get into a similar situation, so I don't
think this is anything new. 

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