On Thu, Aug 8, 2013 at 11:31 AM, Michael McCandless
<luc...@mikemccandless.com> wrote:

> A number of users have complained about the apparent RAM usage of
> WeakIdentityMap, and it adds complexity to ByteBufferIndexInput to do
> this tracking ... I think defaulting the unmap hack to off is best for
> users of MMapDir.
>

For which users? 100/1000QPS users with too-large-heaps who complain
about weak references?

For users with properly configured heap sizes: there is no problem.

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