Scaling problem of HashMap (introduced with alternative hashing)

Eric McCorkle eric.mccorkle at
Thu Dec 27 19:57:32 UTC 2012

It looks like its just generating a unique random seed for each HashMap.  It seems like that could be made thread-local.

On Dec 27, 2012, at 2:16 PM, Zhong Yu <zhong.j.yu at> wrote:

> Reported by the SO question
> the HashMap constructor contains a CAS, which is kind of surprising.
> Could it be removed?
>    transient final int hashSeed =
> sun.misc.Hashing.randomHashSeed(this);  // CAS
> Zhong Yu

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