Question on use of NIO with je

I saw the FAQ entry about NIO: http://www.oracle.com/technology/products/berkeley-db/faq/je_faq.html#24
Could you clarify the problems with NIO and situations it shouldn't be used? Currently we are using it with 3.2 and haven't run into any issues but I don't know if we are just getting lucky.
-Nick

What I recall is that the NIO JVM bugs were related to GC. Direct memory is not managed like ordinary heap memory, so a separate (and buggy) mechanism is used in the JVM. The symptoms were very slow GC and OOME. It's possible that Sun has fixed these problems since then, but as Charles said there is no measurable performance benefit for direct memory in JE, so it is no longer used in JE. As Charles says, ByteBuffers are still used, but this is not a use of direct memory.
--mark                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

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