adoroszlai opened a new pull request #1329:
URL: https://github.com/apache/hadoop-ozone/pull/1329


   ## What changes were proposed in this pull request?
   
   Override some methods only for statistics.  
[S3AFileSystem](https://github.com/apache/hadoop/blob/a6df05bf5e24d04852a35b096c44e79f843f4776/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java#L3003-L3054)
 also does so.
   
   https://issues.apache.org/jira/browse/HDDS-4077
   
   ## How was this patch tested?
   
   Enabled DEBUG log for Ozone FS:
   
   ```
   etc/hadoop/ozone-shell-log4j.properties
   35:log4j.logger.org.apache.hadoop.fs.ozone=DEBUG
   
   etc/hadoop/log4j.properties
   138:log4j.logger.org.apache.hadoop.fs.ozone=DEBUG
   ```
   
   Ran `ozonefs.robot` and verified some previously missing operations are 
logged (for both OFS and O3FS).
   
   ```
   2020-08-12 12:42:38,057 [main] DEBUG ozone.OzoneFSStorageStatistics: 
op_glob_status += 1  ->  1
   ...
   2020-08-12 12:42:51,163 [main] DEBUG ozone.OzoneFSStorageStatistics: 
op_mkdirs += 1  ->  1
   ...
   2020-08-12 12:43:15,071 [main] DEBUG ozone.OzoneFSStorageStatistics: 
op_exists += 1  ->  1
   ```


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