[DIRMINA-948] Performance recession when invoke session.write concurrent

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.7
• Fix Version/s: 2.0.8
• Component/s: Core
• Labels: performance
• Assignee: Unassigned
• Reporter: Mark
• Created: 12/Jul/13 09:08
• Updated: 09/Oct/13 14:39
• Resolved: 09/Oct/13 14:39

Description

In org.apache.mina.core.filterchainDefaultIoFilterChain, code around line number 600,
<code>if (writeRequestQueue.size() == 0 )</code>
will raise performance problem in high concurrent situation, Mina default use ConcurrentLinkedQueue as writeRequestQueue, but size() of this queue is not a constant-time operation, suggest to use <code>if (writeRequestQueue.isEmpty(s))</code> instead of it.