Resolve Security Problems

Cannot Access Kerberos Nodes

If a step or entry cannot access a Kerberos authenticated cluster, review the steps in Use Impersonation to Access a MapR Cluster.

If you are still having problems, make sure the username, password, UID, and GID for each impersonated or spoofed user is the same on each node.  Sometimes they are not the same if a user was  deleted, then recreated with different UIDs and GIDs.

Cannot Access a Hive Cluster

If you cannot use Kerberos impersonation to authenticate and access a Hive cluster, review the steps in Use Impersonation to Access a MapR Cluster.

If problems persist, copy the hive-site.xml file on the Hive server to the MapR distribution in these directories: 

• DI Server: data-integration-server/pentaho-solutions/system/kettle/plugins/ pentaho-big-data-plugin/hadoop-configurations/[mapr distribution]

• Spoon: data-integration/plugins/pentaho-big-data-plugin/hadoop-configurations/[mapr distribution]

If this still does not work, disable pooled connections for Hive.

Cannot use Keytab File to Authenticate Access to PMR Cluster

If you cannot authenticate and gain access to the PMR cluster, copy the keytab file to each task tracker node on the PMR cluster.

HBase Get Master Failed Error

If this error occurs “HBase cannot negation the authenticated portion of the connection” copy the hbase-site.xml file from the HBase server to the MapR distribution in these directories:

• DI Server: data-integration-server/pentaho-solutions/system/kettle/plugins/ pentaho-big-data-plugin/hadoop-configurations/[mapr distribution]

• Spoon: data-integration/plugins/pentaho-big-data-plugin/hadoop-configurations/[mapr distribution]