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From Christopher Penney <cpen...@gmail.com>
Subject Hive with Kerberos and a Remote Metastore
Date Tue, 03 Sep 2013 13:04:11 GMT
I'm new to hive and trying to set it up in a relatively secure manner for a
test environment.  I want to use a remote metastore so MR jobs can access
the DB.  I seem to have things almost working, but when a user with a
credential tries to create a database I get:

    hive> show databases;
    OK
    default
    hive> create database testdb;
    FAILED: Error in metadata: MetaException(message:Got exception:
org.apache.hadoop.ipc.RemoteException User: hdfs/
hadoopserver.sub.dom.com@SUB.DOM.COM is not allowed to impersonate
myuserid@SUB.DOM.COM)
    FAILED: Execution Error, return code 1 from
org.apache.hadoop.hive.ql.exec.DDLTask

I have "hive --service metastore" running as hdfs with hdfs/
hadoopserver.sub.dom.com@SUB.DOM.COM as the principal.  I'm running hive as
"myuserid" on the same box.  I don't know if it's related, but if I try to
run hive from another system I get a GSS Initiate error unless I use the
same principal (hdfs/hadoopserver.sub.dom.com@SUB.DOM.COM) for
hive.metastore.kerberos.principal.  Is that expected?

When I try googling this I see similar issues, but the message about not
being able to impersonate only shows the single part user name where for me
it's showing the realm.  I tried playing with the auth_to_local property,
but it didn't help.  Map Reduce and HDFS operations are working fine
otherwise.

In core-site.xml I have:

    <property>
      <name>hadoop.proxyuser.hdfs.hosts</name>
      <value>*</value>
    </property>

    <property>
      <name>hadoop.proxyuser.hdfs.groups</name>
      <value>*</value>
    </property>

In hive-site.xml I have:

    <property>
      <name>javax.jdo.option.ConnectionURL</name>
      <value>jdbc:mysql://localhost/metastore</value>
      <description>the URL of the MySQL database</description>
    </property>

    <property>
      <name>javax.jdo.option.ConnectionDriverName</name>
      <value>com.mysql.jdbc.Driver</value>
    </property>

    <property>
      <name>javax.jdo.option.ConnectionUserName</name>
      <value>hive</value>
    </property>

    <property>
      <name>javax.jdo.option.ConnectionPassword</name>
      <value>password</value>
    </property>

    <property>
      <name>datanucleus.autoCreateSchema</name>
      <value>false</value>
    </property>

    <property>
      <name>datanucleus.fixedDatastore</name>
      <value>true</value>
    </property>

    <property>
      <name>hive.metastore.uris</name>
      <value>thrift://hadoopserver.sub.dom.com:9083</value>
    </property>

    <property>
      <name>hive.security.authorization.enabled</name>
      <value>true</value>
    </property>

    <property>
      <name>hive.metastore.sasl.enabled</name>
      <value>true</value>
    </property>

    <property>
      <name>hive.metastore.kerberos.keytab.file</name>
      <value>/etc/hadoop/hdfs.keytab</value>
    </property>

    <property>
      <name>hive.metastore.kerberos.principal</name>
      <value>hdfs/hadoopserver.sub.dom.com@SUB.DOM.COM</value>
    </property>

    <property>
        <name>hive.metastore.execute.setugi</name>
        <value>true</value>
    </property>

Any ideas?

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