[HDFS-11805] Ensure LevelDB DBIterator is closed

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: HDFS-7240
• Hadoop Flags: Reviewed
• Assignee: Chen Liang
• Reporter: Xiaoyu Yao
• Created: 10/May/17 22:48
• Updated: 26/Apr/18 21:50
• Resolved: 14/May/17 13:10

Description

DBIterator used in CblockManager/FilteredKeys/SQLCLI/OzoneMetadataManager should be closed after done with the iteration to avoid resource leaking.

try-with-resource should fix that easily for most of the cases. FIlteredKeys may be a special case that I have not fully checked yet.