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From Ted Dunning <>
Subject Re: Create large preallocated file blocks when performing merges
Date Thu, 01 Oct 2009 16:02:59 GMT
The place that it would help is where small writes are done and flushed.

If you do large writes or have good buffering (aka do large writes), then
preallocation probably won't help.

It helps ZK because they are writing a transaction log that must flush each
small write.

On Thu, Oct 1, 2009 at 3:01 AM, Michael McCandless <> wrote:

>  I wasn't able to show that this helped performance
> in practice, though.

Ted Dunning, CTO

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