我正在尝试通过在HBase中创建的Hive访问表。
以下命令已成功执行。
hbase(main):032:0> create 'hbasetohive', 'colFamily'
0 row(s) in 1.9540 seconds
hbase(main):033:0> put 'hbasetohive', '1s', 'colFamily:val','1strowval'
0 row(s) in 0.1020 seconds
hbase(main):034:0> scan 'hbasetohive'
ROW COLUMN+CELL
1s column=colFamily:val, timestamp=1423936170125, value=1strowval
1 row(s) in 0.1170 seconds
-----
hive> CREATE EXTERNAL TABLE hbase_hivetable_k(key string, value string)
> STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
> WITH SERDEPROPERTIES ("hbase.columns.mapping" = "colFamily:val")
> TBLPROPERTIES("hbase.table.name" = "hbasetohive");
OK
Time taken: 1.622 seconds
hive> Select * from hbase_hivetable_k;
OK
1s 1strowval
Time taken: 0.184 seconds, Fetched: 1 row(s)
但执行COUNT（*）
时会出错
hive> select count(1) from hbase_hivetable_k;
Query ID = hduser_20150216081212_f47b2faa-be53-4eb3-b8dd-b56990455977
Total jobs = 1
Launching Job 1 out of 1
Number of reduce tasks determined at compile time: 1
In order to change the average load for a reducer (in bytes):
set hive.exec.reducers.bytes.per.reducer=<number>
In order to limit the maximum number of reducers:
set hive.exec.reducers.max=<number>
In order to set a constant number of reducers:
set mapred.reduce.tasks=<number>
java.lang.RuntimeException: java.io.IOException: Merging of credentials not supported in this version of hadoop
at org.apache.hadoop.hive.hbase.HBaseStorageHandler.configureJobConf(HBaseStorageHandler.java:485)
at org.apache.hadoop.hive.ql.plan.PlanUtils.configureJobConf(PlanUtils.java:856)
at org.apache.hadoop.hive.ql.plan.MapWork.configureJobConf(MapWork.java:540)
at org.apache.hadoop.hive.ql.plan.MapredWork.configureJobConf(MapredWork.java:68)
at org.apache.hadoop.hive.ql.exec.mr.ExecDriver.execute(ExecDriver.java:370)
at org.apache.hadoop.hive.ql.exec.mr.MapRedTask.execute(MapRedTask.java:137)
at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:160)
at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:85)
at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1604)
at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1364)
at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1177)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1004)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:994)
at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:247)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:199)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:410)
at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:783)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:677)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:616)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.hadoop.util.RunJar.main(RunJar.java:160)
Caused by: java.io.IOException: Merging of credentials not supported in this version of hadoop
at org.apache.hadoop.hive.shims.Hadoop20SShims.mergeCredentials(Hadoop20SShims.java:527)
at org.apache.hadoop.hive.hbase.HBaseStorageHandler.configureJobConf(HBaseStorageHandler.java:483)
... 23 more
Job Submission failed with exception 'java.lang.RuntimeException(java.io.IOException: Merging of credentials not supported in this version of hadoop)'
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask
我使用的是Hadoop 1.2.1版，Hive版本0.14.0，HBase版本0.94.8
您能不能让我知道我需要更新哪个版本才能使其正常运行。
问候 - Koushik
答案 0 :(得分：0)
你应该更新hadoop的版本。使用hadoop 2.4.0，一切都会正常工作