Support Article

Unable to connect to Hadoop database cluster

SA-12129

Summary



You are unable to connect to a Hadoop cluster. When you try to Test Connectivity, you see the error on screen.

Error Messages



Connection with HBase cannot be established. Please check your configuration. There are no Hadoop jars available on classpath.

2015-06-24 07:29:29,422 [ WebContainer : 8] [TABTHREAD3] [DFFW_Intake:04.27.99] (il.classloader.PRClassLoaderDB) WARN | - Invalid reference to non-public interface from class "com.pegarules.generated.activity.ra_action_pztestconnection_0ab878a2c2b57a22708f53bf46dd3107" to "com.pega.pegarules.integration.engine.internal.connect.hbase.HBaseConfig"
2015-06-24 07:29:29,427 [ WebContainer : 8] [TABTHREAD3] [DFFW_Intake:04.27.99] (il.classloader.PRClassLoaderDB) WARN | - Invalid reference to non-public interface from class "com.pegarules.generated.activity.ra_action_pztestconnection_0ab878a2c2b57a22708f53bf46dd3107" to "com.pega.pegarules.integration.engine.internal.connect.hbase.HBasePingResult"
2015-06-24 07:29:29,427 [ WebContainer : 8] [TABTHREAD3] [DFFW_Intake:04.27.99] (il.classloader.PRClassLoaderDB) WARN | - Invalid reference to non-public interface from class "com.pegarules.generated.activity.ra_action_pztestconnection_0ab878a2c2b57a22708f53bf46dd3107" to "com.pega.pegarules.integration.engine.internal.connect.hbase.HBaseClient"
2015-06-24 07:29:29,540 [ WebContainer : 8] [TABTHREAD3] [DFFW_Intake:04.27.99] (on.HadoopAuthenticationManager) ERROR |1java.lang.ClassNotFoundException: org.apache.hadoop.conf.Configuration


Steps to Reproduce



Test connectivity to a Hadoop cluster.

Root Cause



A defect in Pegasystems’ code or rules

Resolution



Connecting to a Hadoop cluster as an external database, outside of the Predictive Analytics feature in DSM,  is not supported in Pega 7.1.8 and earlier releases.

Starting with Pega 7.2.x, connecting to a Hadoop cluster as an external source is available
 only by installing relevant dependencies to the Pega Platform, as explained in this PDN Article, https://pdn.pega.com/jar-file-dependencies-hbase-and-hdfs-data-sets.

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Published November 16, 2016 - Updated October 8, 2020

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