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Review request for ranger, Madhan Neethiraj, Mehul Parikh, Pradeep Agrawal, and Ramesh Mani. Bugs: RANGER-2944 https://issues.apache.org/jira/browse/RANGER-2944 Repository: ranger Description ------- In the configuration of Ranger Presto plugin service, password is not a required content. Only when SSL is enabled in Presto, we need to fill in the password. When Presto does not enable SSL, if you fill in the password when configuring the service, the connection will fail and an exception will be thrown. ```java java.sql.SQLException: Authentication using username/password requires SSL to be enabled ``` However, currently in the code, we always put `prop.getProperty(HadoopConfigHolder.RANGER_LOGIN_PASSWORD)` to prestoProperties, if the password is not set, `prop.getProperty(HadoopConfigHolder.RANGER_LOGIN_PASSWORD)` will be null. If we put a null value to Properties, this will throw NPE. We need to check whether we have set the password. Diffs ----- plugin-presto/src/main/java/org/apache/ranger/services/presto/client/PrestoClient.java 37c2346e0 Diff: https://reviews.apache.org/r/72749/diff/1/ Testing ------- The lookupResource returns to normal, and the auto-completion function returns to normal when configured in the presto policy. Thanks, Jiayi Liu