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From Camille Fournier <cami...@apache.org>
Subject Re: Extremely different readings on different zookeeper deployments
Date Tue, 07 Feb 2017 19:20:44 GMT
Disk writing speed is one of the major factors for zk write performance. Is
the disk setup the same across both of these machines? My guess is that is
a big factor.

On Tue, Feb 7, 2017 at 2:24 AM, Amar Gajbhiye <Amar.Gajbhiye@1eq.com> wrote:

> Hi,
> I am working on a distributed system where I want to use consensus
> algorithm. I am evaluating ZooKeeper for the same.
> I am trying to quantify read and write operations for zookeeper for
> version 3.5.2.
>
> I am running following operations.
>
>
> 1.       Create 50k Znodes with data
>
> 2.       Read from those 50k znodes
>
>
> I tried this operations when zookeeper server was running on 4 different
> remote servers in standalone mode. My client was always on same machine.
>
>
> 1.       Test case 1
>
> Server configuration : Windows 8 server R2.
>
> jdk 1.7.0_80
>
> Avg time required for each write operations : 1.8 ms
>
> Avg time required for each read operations : 0.9 ms
>
>
>
>
> 2.       Test case 2
>
> Server configuration : Windows 8 server R2.
>
> jdk 1.7.0_21
>
> Avg time required for each write operation : 1.7 ms
>
> Avg time required for each read operation : 0.9 ms
>
>
>
>
>
> 3.       Test case 3
>
> Server configuration : Windows 7
>
> jdk 1.7.0_25
>
> Avg time required for each write operation : 35 ms
>
> Avg time required for each read operation : 0.8 ms
>
>
>
>
>
> 4.       Test case 4
>
> Server configuration : Windows 7
>
> jdk1.8.0_101
>
> Avg time required for each write operation : 40 ms
>
> Avg time required for each read operation : 0.9 ms
>
>
>
>
>
> 5.       To get network latency out of picture, I kept both client and
> server on same machine with following configuration
>
> Server configuration : Windows 7
>
> jdk1.8.0_101
>
> Avg time required for each write operation : 30 ms
>
> Avg time required for each read operation : 0.4 ms
>
> Still, I got same readings.
>
>
>
> I do not understand, why ZooKeeper gave such a poor write performance on
> some machines with windows 7. I tried these test cases with different jdk
> versions. But I am getting same result.
>
>
>
> However, Read operation performance was same across all deployments.
>
>
>
> Can someone please point out the possible cause for such extreme results ?
>
>
>
>
>
> Thanks,
>
> Amar
>
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