[CASSANDRA-20226][trunk] Reduce contention in NativeAllocator.allocate #4415
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…yAllocate with allocatedUpdater.addAndGet(this, size) Patch by Dmitry Konstantinov; reviewed by TBD for CASSANDRA-20226
…om updates via AtomicLongFieldUpdater to LongAdder usage. MemtableAllocator.SubAllocator#acquired(..) method updates "owns" value but does not use the updated result. Patch by Dmitry Konstantinov; reviewed by TBD for CASSANDRA-20226
…into a memtable and allocate this memory in one shot, then use it as a request-local SLAB Patch by Dmitry Konstantinov; reviewed by TBD for CASSANDRA-20226
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Patch by Dmitry Konstantinov; reviewed by TBD for CASSANDRA-20226