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HBase, mail # user - HRegionInfo was null or empty in -ROOT-


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HRegionInfo was null or empty in -ROOT-
Nichole Treadway 2011-03-30, 14:21
Hi all,

This morning I was restarting my HBase cluster, and I'm finding that the
region servers start up fine, but master always fails with the following
error shown in the web ui:

Problem accessing /master.jsp. Reason:

    Trying to contact region server null for region , row '', but
failed after 10 attempts.
Exceptions:
java.io.IOException: HRegionInfo was null or empty in -ROOT-,
row=keyvalues={.META.,,1/info:server/1301428760725/Put/vlen=33,
.META.,,1/info:serverstartcode/1301428760725/Put/vlen=8}
java.io.IOException: HRegionInfo was null or empty in -ROOT-,
row=keyvalues={.META.,,1/info:server/1301428760725/Put/vlen=33,
.META.,,1/info:serverstartcode/1301428760725/Put/vlen=8}
...

Caused by:
org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to
contact region server null for region , row '', but failed after 10
attempts.
Exceptions:
java.io.IOException: HRegionInfo was null or empty in -ROOT-,
row=keyvalues={.META.,,1/info:server/1301428760725/Put/vlen=33,
.META.,,1/info:serverstartcode/1301428760725/Put/vlen=8}
java.io.IOException: HRegionInfo was null or empty in -ROOT-,
row=keyvalues={.META.,,1/info:server/1301428760725/Put/vlen=33,
.META.,,1/info:serverstartcode/1301428760725/Put/vlen=8}
...

Here is what I get when I scan -ROOT-:
hbase(main):001:0> scan '-ROOT-'
ROW                                     COLUMN+CELL
 .META.,,1                              column=info:server,
timestamp=1301428760725, value=sspv2rndhadoop1.gce2000.com:60020
 .META.,,1                              column=info:serverstartcode,
timestamp=1301428760725, value=1301428748891

Any ideas what's going on / how I can fix this?
Cluster info: 4 nodes, hadoop-0.20-append, hbase-0.90.3, red hat 5.5,
64-bit, jdk1.6; 64 gb ram, 2.8ghz.
Thanks guys