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From Adam Silberstein <a...@trifacta.com>
Subject org.apache.hadoop.hive.metastore.HiveMetaStoreClient with webhcat REST
Date Fri, 14 Mar 2014 17:00:29 GMT
Hi,
I'm testing out the REST interface to webhcat and stuck doing basic DDL operations.

Background on installation:
--I installed packages with apt-get
--I'm on CDH4.5

I successfully have created and loaded tables with chat command line.  E.g.:hcat -e 'create
table testtable (a string, b string, c int);'
I did some loading by hand and via Pig.  So I think the HCatalog service is running correctly.

Here's what I am seeing via curl:
$ curl http://localhost:50111/templeton/v1/ddl/database/testtable?user.name=<myname>

{"errorDetail":"\norg.apache.hadoop.hive.ql.metadata.HiveException: org.apache.hadoop.hive.ql.metadata.HiveException:
java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient\n\tat
org.apache.hadoop.hive.ql.exec.DDLTask.descDatabase(DDLTask.java:2647)\n\tat org.apache.hadoop.hive.ql.exec.DDLTask.execute(DDLTask.java:244)\n\tat
org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:138)\n\tat org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:66)\n\tat
org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1383)\n\tat org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1169)\n\tat
org.apache.hadoop.hive.ql.Driver.run(Driver.java:982)\n\tat org.apache.hadoop.hive.ql.Driver.run(Driver.java:902)\n\tat
org.apache.hcatalog.cli.HCatDriver.run(HCatDriver.java:43)\n\tat org.apache.hcatalog.cli.HCatCli.processCmd(HCatCli.java:251)\n\tat
org.apache.hcatalog.cli.HCatCli.processLine(HCatCli.java:205)\n\tat org.apache.hcatalog.cli.HCatCli.main(HCatCli.java:164)\n\tat
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n\tat sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)\n\tat
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n\tat
java.lang.reflect.Method.invoke(Method.java:622)\n\tat org.apache.hadoop.util.RunJar.main(RunJar.java:208)\n","error":"FAILED:
Error in metadata: org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.RuntimeException:
Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient","errorCode":500}

I found a bunch of help online so I tried adding some things in webhcat-site.xml
-templeton.libjars: I added paths to a bunch of libraries, including '/usr/lib/hive/lib/hive-metastore-0.10.0-cdh4.5.0.jar'
which has the missing HiveMetaStoreClient class.  Then restarted webhcat, can't tell if it
picked up this property.
-Less promising, I uploaded the hive tar.gz file to HDFS and updated their paths in templeton.hive.archive
and templeton.hive.path.  Skeptical the server would be looking in HDFS for libraries, and
this didn't help either.
-There is older material from ~2011 as well, but ignoring that.

If you have any suggestions please share.  Thanks in advance!

-Adam


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