[CASSANDRA-2654] Work around native heap leak in sun.nio.ch.Util affecting IncomingTcpConnection

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 0.7.7, 0.8.1

Environment

OpenJDK Runtime Environment (IcedTea6 1.9.7) (6b20-1.9.7-0ubuntu1~10.04.1)
OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode)

Also observed on Sun/Oracle JDK. Probably platform- and os-independent.

• Assignee: Hannes Schmidt
• Reporter: Hannes Schmidt

Authors

Hannes Schmidt

Reviewers

Jonathan Ellis

• Created: 15/May/11 18:40
• Updated: 16/Apr/19 09:32
• Resolved: 03/Jun/11 23:48

Description

NIO's leaky, per-thread caching of direct buffers in combination with IncomingTcpConnection's eager buffering of messages leads to leakage of large amounts of native heap. Details in [1]. More on the root cause in [2]. Even though it doesn't fix the leak, attached patch has been found to alleviate the problem by keeping the size of each direct buffer modest.