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From "Keith Turner (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-2357) Document StatsIterator
Date Wed, 12 Feb 2014 16:34:20 GMT


Keith Turner commented on ACCUMULO-2357:

I have seen measurable performance impacts when accessing AtomicLongs  too often.  I think
in this case I was trying to avoid this.  Incrementing the non-volatile can possibly be done
in cache or in a register.  Incrementing the volitale has to go to main memory and may cause
a cache flush. 

I think I just pulled 23 out of thin air, not sure if its too low.  I don't think I did performance
testing to pick the number.  

> Document StatsIterator
> ----------------------
>                 Key: ACCUMULO-2357
>                 URL:
>             Project: Accumulo
>          Issue Type: Task
>            Reporter: Vikram Srivastava
>            Priority: Minor
> In particular it's not clear why it resets numRead to zero in {{next()}} after it reaches

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