question Re: log4j:ERROR Could not find value for key log4j.appender.A in Support Questions

log4j:ERROR Could not find value for key log4j.appender.A

HanzalaShaikh — Mon, 27 Jul 2020 10:33:41 GMT

I am setting up a Pre prod cluster from Path B. I ran the command "/usr/share/cmf/schema/scm_prepare_database.sh mysql -h mysqldatabase scm temp password" to check the database status. I am getting the error of log4j however the SCM database is configured correctly. Please find the below error and suggest any workaround for this error.

[root@clouderamanage cloudera-scm-server]# /usr/share/cmf/schema/scm_prepare_database.sh mysql -h webserver scmmysqldatabase password
JAVA_HOME=/usr/java/jdk1.7.0_67-cloudera
Verifying that we can write to /etc/cloudera-scm-server
Creating SCM configuration file in /etc/cloudera-scm-server
Executing: /usr/java/jdk1.7.0_67-cloudera/bin/java -cp /usr/share/java/mysql-connector-java.jar:/usr/share/java/oracle-connector-java.jar:/usr/share/java/postgresql-connector-java.jar:/usr/share/cmf/schema/../lib/* com.cloudera.enterprise.dbutil.DbCommandExecutor /etc/cloudera-scm-server/db.properties com.cloudera.cmf.db.
log4j: ERROR Could not find value for key log4j.appender.A
log4j: ERROR Could not instantiate appender named "A".
[2020-07-27 10:20:19,893] INFO 0[main] - com.cloudera.enterprise.dbutil.DbCommandExecutor.testDbConnection(DbCommandExecutor.java) - Successfully connected to database.
All done, your SCM database is configured correctly!

Re: log4j:ERROR Could not find value for key log4j.appender.A

GangWar — Tue, 28 Jul 2020 07:15:24 GMT

@HanzalaShaikh This seems a very old cosmetic issue in CM. What version you are using?

It appears in older versions we had some early bugs caused by the addition of a new jar file in the classpath directory (/usr/share/cmf/schema/../lib/* ) used by the scm_prepare_db.sh script. This new jar contained a log4j.properties file that was not configured to use the log4j appender A, and overwrote the original properties from the proper log4j.properties file in the original jar file.

Re: log4j:ERROR Could not find value for key log4j.appender.A

HanzalaShaikh — Thu, 30 Jul 2020 16:33:06 GMT

Thanks a lot for your quick reply and for providing a detailed explanation, really appreciated. I was using a 5.14.1 version of Cloudera. Yes, there is a bug in the older version I realized soon after that, but your explanation has made me understand the reason behind the error.

Re: log4j:ERROR Could not find value for key log4j.appender.A

supersonic-2021 — Mon, 06 Mar 2023 02:01:41 GMT

how to solve this?

Re: log4j:ERROR Could not find value for key log4j.appender.A

cjervis — Tue, 07 Mar 2023 20:04:28 GMT

Welcome to the community @supersonic-2021 . As this is an older post, we recommend starting a new thread. The new thread will provide the opportunity to provide details specific to your environment that could aid others in providing a more accurate answer to your question.