我正在尝试以伪分布式模式运行HBase MapReduce作业，并发生以下NoServerForRegionException。我已检查端口60010上的主节点和端口60030上的区域服务器的状态。它们都正常工作。
13/12/09 11:04:41 ERROR mapreduce.TableOutputFormat: org.apache.hadoop.hbase.client.NoServerForRegionException: Unable to find region for test_summary,,99999999999999 after 10 tries.
13/12/09 11:04:41 INFO mapred.JobClient: Cleaning up the staging area hdfs://sandbox:8020/user/root/.staging/job_201312091058_0001
Exception in thread "main" java.lang.RuntimeException: org.apache.hadoop.hbase.client.NoServerForRegionException: Unable to find region for test_summary,,99999999999999 after 10 tries.
at org.apache.hadoop.hbase.mapreduce.TableOutputFormat.setConf(TableOutputFormat.java:206)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:62)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:970)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:936)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:936)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:550)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:580)
at com.ebay.traffic.opendata.hbasemapreduce.FreqCounter.main(FreqCounter.java:82)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:160)
Caused by: org.apache.hadoop.hbase.client.NoServerForRegionException: Unable to find region for test_summary,,99999999999999 after 10 tries.
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:926)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:832)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:801)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:933)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:836)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:801)
at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:234)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:174)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:133)
at org.apache.hadoop.hbase.mapreduce.TableOutputFormat.setConf(TableOutputFormat.java:201)
... 16 more
有人可以建议可能的原因是什么？提前谢谢！