hi, all

I met this exception when I doing intensive insertions using YCSB.  Anybody
give me some clues on this? I use hbase 0.20.6.

com.yahoo.ycsb.DBException:
org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to contact
region server  -- nothing found, no 'location' returned,
tableName=usertable, reload=true -- for region , row 'user1001412274', but
failed after 11 attempts.
Exceptions:
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501

        at com.yahoo.ycsb.db.HBaseClient.cleanup(Unknown Source)
        at com.yahoo.ycsb.DBWrapper.cleanup(Unknown Source)
        at com.yahoo.ycsb.ClientThread.run(Unknown Source)
Caused by: org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying
to contact region server  -- nothing found, no 'location' returned,
tableName=usertable, reload=true -- for region , row 'user1001412274', but
failed after 11 attempts.
Exceptions:
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501
org.apache.hadoop.hbase.client.NoServerForRegionException: No server address
listed in .META. for region usertable,,1291950247501

        at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.getRegionLocationForRowWithRetries(HConnectionManager.java:1095)
        at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.access$200(HConnectionManager.java:240)
        at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers$Batch.getRegionName(HConnectionManager.java:1191)
        at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers$Batch.process(HConnectionManager.java:1168)
        at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.processBatchOfRows(HConnectionManager.java:1238)
        at
org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:666)
        ... 3 more

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