Help Center/ MapReduce Service/ User Guide (Ankara Region)/ Troubleshooting/ Using Spark/ JDBCServer Connection Failure

Updated on 2024-11-29 GMT+08:00

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JDBCServer Connection Failure

Symptom

The ha-cluster cannot be identified (unknowHost or port required).
Failed to connect to JDBCServer.

Cause Analysis

Symptom 1: The spark-beeline command is used to connect to JDBCServer. JDBCServer in versions earlier than MRS_3.0 adopts HA mode. Therefore, a specific URL and the JAR package provided by MRS Spark is required to connect to JDBCServer.
Symptom 2: The JDBCServer service is not running properly or port listening is abnormal.

Procedure

Symptom 1: Use a specific URL and the JAR package provided by MRS Spark to connect to JDBCServer.
Symptom 2: Check that the JDBCServer service is running properly and port listening is normal, and try again.

Parent topic: Using Spark

Previous topic: Spark Task Execution Failure

Next topic: Failed to View Spark Task Logs

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