Hi,
I have setup a Hadoop cluster on Amazon EC2 with my data stored on S3. I would
like to use Hive to process the data on S3.
I created an external table in hive using the following:
CREATE EXTERNAL TABLE mytable1
(
HIT_TIME_GMT string,
SERVICE string
) ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t'
LOCATION 's3n://com.xxxxx.webanalytics/hive/';
I loaded a few records into the table (LOAD DATA LOCAL INPATH
'/home/ubuntu/data/play/test' INTO TABLE mytable1;) .
Select * from mytable1; shows me the data in the table.
When I try to run the query which requires a map-reduce job to be run, for
example, select count(*) from mytable1; I see an exception thrown.
Total MapReduce 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.io.FileNotFoundException: File does not exist: /hive/test
at
org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:527)
at
org.apache.hadoop.mapred.lib.CombineFileInputFormat$OneFileInfo.<init>(CombineFileInputFormat.java:462)
at
org.apache.hadoop.mapred.lib.CombineFileInputFormat.getMoreSplits(CombineFileInputFormat.java:256)
at
org.apache.hadoop.mapred.lib.CombineFileInputFormat.getSplits(CombineFileInputFormat.java:212)
at
org.apache.hadoop.hive.shims.Hadoop20SShims$CombineFileInputFormatShim.getSplits(Hadoop20SShims.java:347)
at
org.apache.hadoop.hive.shims.Hadoop20SShims$CombineFileInputFormatShim.getSplits(Hadoop20SShims.java:313)
at
org.apache.hadoop.hive.ql.io.CombineHiveInputFormat.getSplits(CombineHiveInputFormat.java:377)
at
org.apache.hadoop.mapred.JobClient.writeOldSplits(JobClient.java:1026)
at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:1018)
at org.apache.hadoop.mapred.JobClient.access$600(JobClient.java:174)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:929)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:882)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1278)
at
org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:882)
at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:856)
at
org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:671)
at
org.apache.hadoop.hive.ql.exec.MapRedTask.execute(MapRedTask.java:123)
at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:131)
at
org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1063)
at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:900)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:748)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:209)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:286)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:516)
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:197)
Job Submission failed with exception 'java.io.FileNotFoundException(File does
not exist: /hive/test)'
FAILED: Execution Error, return code 1 from
org.apache.hadoop.hive.ql.exec.MapRedTask
The file does exist and I can see it on S3. Select * from table is returning
the data in the table. I am not sure what is going wrong when a map-reduce job
is being initiated by the hive query. Any pointer as to where I went wrong?
Appreciate your help.
Thank you
Suman
