[IMPALA-3611] Impala should report unused DiskIOMgr buffer memory consumption

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Impala 2.6.0
• Fix Version/s: Impala 2.7.0
• Component/s: Backend
• Labels: resource-management
• Target Version: Impala 2.7.0
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 24/May/16 20:57
• Updated: 15/Aug/16 22:30
• Resolved: 15/Aug/16 22:30

Description

To aid debugging/supportability, it would be good if MemTracker dumps could report how much memory was consumed by unused I/O buffers. This is mainly useful in understanding idle memory consumption of Impala, since a significant number of I/O buffers can be stored in free lists by the DiskIoMgr.