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Scenario: Apache Phoenix connectivity issues in Azure HDInsight

  • Artikkeli

This article describes troubleshooting steps and possible resolutions for issues when interacting with Azure HDInsight clusters.

Issue

Unable to connect to Apache HBase with Apache Phoenix. Reasons may vary.

Cause: Incorrect IP

Incorrect IP of active Zookeeper node.

Resolution

The IP of the active Zookeeper node can be identified from the Ambari UI by following the links to HBase > Quick Links > ZK (Active) > Zookeeper Info. Correct the IP as needed.

Cause: SYSTEM.CATALOG table offline

When running commands such as !tables, you receive an error message similar to:

Error while connecting to sqlline.py (Hbase - phoenix) Setting property: [isolation, TRANSACTION_READ_COMMITTED] issuing: !connect jdbc:phoenix:10.2.0.7 none none org.apache.phoenix.jdbc.PhoenixDriver Connecting to jdbc:phoenix:10.2.0.7 SLF4J: Class path contains multiple SLF4J bindings.

When running commands such as count 'SYSTEM.CATALOG', you receive an error message similar to:

ERROR: org.apache.hadoop.hbase.NotServingRegionException: Region SYSTEM.CATALOG,,1485464083256.c0568c94033870c517ed36c45da98129. is not online on 10.2.0.5,16020,1489466172189)

Resolution

From the Apache Ambari UI, complete the following steps to restart the HMaster service on all ZooKeeper nodes:

  1. From the Summary section of HBase, go to HBase > Active HBase Master.

  2. From the Components section, restart the HBase Master service.

  3. Repeat these steps for all remaining Standby HBase Master services.

It can take up to five minutes for the HBase Master service to stabilize and finish the recovery. After the SYSTEM.CATALOG table is back to normal, the connectivity issue to Apache Phoenix should get resolved automatically.

Next steps

If you didn't see your problem or are unable to solve your issue, visit one of the following channels for more support:

  • Get answers from Azure experts through Azure Community Support.

  • Connect with @AzureSupport - the official Microsoft Azure account for improving customer experience. Connecting the Azure community to the right resources: answers, support, and experts.

  • If you need more help, you can submit a support request from the Azure portal. Select Support from the menu bar or open the Help + support hub. For more detailed information, review How to create an Azure support request. Access to Subscription Management and billing support is included with your Microsoft Azure subscription, and Technical Support is provided through one of the Azure Support Plans.