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From Anton Vinogradov <avinogra...@gridgain.com>
Subject Re: contention on DataStructure creation/removing
Date Wed, 31 May 2017 12:24:53 GMT

This can solve "slow reentrantLock" issue, at least at creation stage.

On Wed, May 31, 2017 at 3:04 PM, Mikhail Cherkasov <mcherkasov@gridgain.com>

> Hi all,
> All DataStructures are stored in one Map which itself is stored in
> utilityCache, this makes high contention on DS creation or removing, it
> requires to acquire Map's lock and manipulation with the Map under the
> lock. So all threads in cluster should wait for this lock to create or
> remove DS.
> I don't see any reason to store all DS in one map,  we already have
> utilityCache and can save DSs directly in utilityCache, to distinguish DS
> with other objects in utilityCache I use composite key, the first part of
> which is DATA_STRUCTURES_KEY, second one is DS's name, also DS type can be
> added, this will allow us to create different DS with the same name.
> There is draft implementations, all DSs are stored with unique key in
> utilityCache:
> https://github.com/apache/ignite/pull/2046/files
> May be there's some reason to store all DS in one Map that I missed?
> Any thoughts?
> --
> Thanks,
> Mikhail.

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