[HBASE-17065] Perform more effective sorting for RPC Handler Tasks

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.0.0-beta-1, 2.0.0
• Labels: rpc ui
• Hadoop Flags: Reviewed
• Assignee: Reid Chan
• Reporter: Ted Yu
• Created: 10/Nov/16 18:21
• Updated: 21/Mar/18 22:20
• Resolved: 01/Nov/17 17:08

Description

Under the 'Show All RPC Handler Tasks' tab, the tasks are not sorted according to the duration they have been in the current state (see picture).

In TaskMonitorTmpl.jamon :

long now = System.currentTimeMillis();
Collections.reverse(tasks);

The underlying tasks are backed by CircularFifoBuffer, leading to ineffective sorting.

We should display tasks with the longest duration (in current state) first.