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From Alex Dzyoba <alex.dzy...@gmail.com>
Subject Re: Zookeeper memory usage
Date Tue, 24 Jul 2018 11:27:38 GMT
I forgot to mention that I'm using Zookeeper version 3.5.3-beta
On Tue, Jul 24, 2018 at 2:16 PM Alex Dzyoba <alex.dzyoba@gmail.com> wrote:
>
> Hi,
>
> Could someone shed some light on why Zookeeper eats that much memory?
> I have a cluster of 3 with 11 million znodes in it and `mntr` tells me
> that the approximate data size is 9GB (9019066201 precisely) and the
> snapshot size on disk is 9.3 GB. But the JVM itself eats a whopping
> 26GB of RAM.
>
> Here is the jstat output for my leader instance:
>
>  S0C    S1C    S0U    S1U      EC       EU        OC         OU
> MC     MU    CCSC   CCSU   YGC     YGCT    FGC    FGCT     GCT
>  0.0   114688.0  0.0   114688.0 12058624.0 11141120.0 19193856.0
> 16508964.9 17024.0 16305.7 1920.0 1701.6    728   68.993   0
> 0.000   68.993
>
> If we sum usage for all spaces (S0U + S1U + EU + OU + MU + CCSU) it
> will be 26 GB.
>
> Why is there such mismatch between zookeeper approximate data size of
> 9GB and actual JVM usage (26GB)? Even if we count only G1 old space
> it's still 16 GB memory usage.
>
> I use openjdk 1.8.0_141 with G1GC.
>
> Thanks!

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