[jira] [Created] (HDFS-17616) Logging Enhancement for Datanode Replacement Policy Configuration in ReplaceDatanodeOnFailure

["LoggingResearch (Jira)" <ji...@apache.org>]

LoggingResearch created HDFS-17616:
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             Summary: Logging Enhancement for Datanode Replacement Policy Configuration in ReplaceDatanodeOnFailure
                 Key: HDFS-17616
                 URL: https://issues.apache.org/jira/browse/HDFS-17616
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs
    Affects Versions: 3.3.6
         Environment: Version: {{`3.3.6`}}
Location: {{{}`hadoop/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/ReplaceDatanodeOnFailure.java`{}}}, in {{`getPolicy`}} method, lines 157-159, 161-169,1770-172.
            Reporter: LoggingResearch
         Attachments: TestReplaceDatanodeOnFailure.java, original-vs-log-enhanced.md

This case focuses on improving the logging within the {{getPolicy}} method in {{ReplaceDatanodeOnFailure.java}} to provide more informative messages about the configuration of the Datanode replacement policy. The original code does not provide adequate logging, making it difficult to determine why a specific policy is applied or why an error occurs due to an invalid configuration.
 
*Expected Behavior:* 
The system should log the selected Datanode replacement policy based on the configuration settings or provide clear error messages when an invalid configuration is encountered.
 
*How-to-Fix:*
Enhance the {{getPolicy}} method to include logging statements that inform users about the chosen policy and provide guidance when an invalid configuration is detected.



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