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https://issues.apache.org/jira/browse/AMBARI-23797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Scott Duan resolved AMBARI-23797.
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Resolution: Fixed
> Handle null values for configurations in the Execution Command API
> ------------------------------------------------------------------
>
> Key: AMBARI-23797
> URL: https://issues.apache.org/jira/browse/AMBARI-23797
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 3.0.0
> Reporter: Scott Duan
> Assignee: Scott Duan
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.0.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> /var/lib/ambari-agent/cache/cluster_cache/configurations.json
> {noformat}
> "zookeeper-env": {
> "content": "\nexport JAVA_HOME=\{{java64_home}}\nexport
> ZOOKEEPER_HOME=\{{zk_home}}\nexport ZOO_LOG_DIR=\{{zk_log_dir}}\nexport
> ZOOPIDFILE=\{{zk_pid_file}}\nexport
> SERVER_JVMFLAGS=\{{zk_server_heapsize}}\nexport
> JAVA=$JAVA_HOME/bin/java\nexport
> CLASSPATH=$CLASSPATH:/usr/share/zookeeper/*\n\n\{% if security_enabled
> %}\nexport SERVER_JVMFLAGS=\"$SERVER_JVMFLAGS
> -Djava.security.auth.login.config=\{{zk_server_jaas_file}}\"\nexport
> CLIENT_JVMFLAGS=\"$CLIENT_JVMFLAGS
> -Djava.security.auth.login.config=\{{zk_client_jaas_file}}\"\n\{% endif %}",
> "zk_server_heapsize": "1024m",
> "zk_user": "zookeeper",
> "zookeeper_keytab_path": null,
> "zk_log_dir": "/var/log/zookeeper",
> "zookeeper_principal_name": null,
> "zk_pid_dir": "/var/run/zookeeper"
> }
> {noformat}
> Related code
> params.py
> {noformat}
> zk_principal_name = module_configs.get_property_value(module_name,
> 'zookeeper-env', 'zookeeper_principal_name', '[email protected]')
> zk_principal = zk_principal_name.replace('_HOST', hostname.lower())
> {noformat}
> the api only picks up the default when no key exists
> if zookeeper_principal_name does not exist
> it will return default value
> but now zookeeper_principal_name maps to value null
> so api thinks null is a valid value
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