How Do I Do If PostgreSQL or GaussDB Fails to Connect?

Updated on 2024-12-11 GMT+08:00

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Question

How do I do if PostgreSQL or GaussDB fails to connect?

Answer

Scenario 1: (import scenarios) Run the sqoop import command to extract the open source PostgreSQL to MRS HDFS or Hive.
- Symptom:
  The sqoop command can be executed to query PostgreSQL tables, but an error is reported when the sqoop import command is executed.
  - The authentication type 12 is not supported. Check that you have configured the pg_hba.conf file to include the client's IP address or subnet, and that it
  - The authentication type 5 is not supported. Check that you have configured the pg_hba.conf file to include the client's IP address or subnet, and that it
- Root cause:
  - If the authentication type is 5, the root cause is as follows: When the sqoop import command is executed, a MapReduce job is started. The PostgreSQL driver package gsjdbc4-*.jar exists in the MRS Hadoop installation directory /opt/Bigdata/FusionInsight_HD_*/1_*_NodeManager/install/hadoop/share/hadoop/common/lib, which is incompatible with the open source PostgreSQL service. As a result, an error is reported.
  - If the authentication type is 12, the root cause is as follows: The pg_hba.conf file of the database is incorrectly configured.
- Solution:
  - If the authentication type is 5, the solution is as follows: Move the driver package gsjdbc4-*.jar to the tmp directory on each node where MRS NodeManager instance is deployed.
    mv /opt/Bigdata/FusionInsight_HD_*/1_*_NodeManager/install/hadoop/share/hadoop/common/lib/gsjdbc4-*.jar /tmp
  - If the authentication type is 12, the solution is as follows: Modify the pg_hba.conf file of the database by changing the value of ADDRESS to the IP address of the node where Sqoop resides.
Scenario 2: (export scenarios) Run the sqoop export command to extract the open source PostgreSQL to MRS HDFS or Hive.
- Symptom:
  The sqoop command can be executed to query PostgreSQL tables, but the error message "The authentication type 5 is not supported." is displayed when the sqoop export command is executed. Check that you have configured the pg_hba.conf file to include the client's IP address or subnet, and that it
- Root cause:
  When the sqoop export command is executed, a MapReduce job is started. The PostgreSQL driver package gsjdbc4-*.jar exists in the MRS Hadoop installation directory /opt/Bigdata/FusionInsight_HD_*/1_*_NodeManager/install/hadoop/share/hadoop/common/lib, which is incompatible with the open-source PostgreSQL service. As a result, an error is reported.
- Solution:
  1. Move the driver package gsjdbc4-*.jar to the tmp directory on each node where MRS NodeManager instance is deployed.
    mv /opt/Bigdata/FusionInsight_HD_*/1_*_NodeManager/install/hadoop/share/hadoop/common/lib/gsjdbc4-*.jar /tmp
  1. Delete /opt/Bigdata/client/Hive/Beeline/lib/gsjdbc4-*.jar.