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From Stack <st...@duboce.net>
Subject Re: How to avoid stop-the-world GC for HBase Region Server under big heap size
Date Thu, 23 Aug 2012 15:56:25 GMT
On Wed, Aug 22, 2012 at 11:06 PM, Gen Liu <geliu@zynga.com> wrote:
> Hi,
>
> We are running Region Server on big memory machine (70G) and set Xmx=64G.
> Most heap is used as block cache for random read.
> Stop-the-world GC is killing the region server, but using less heap (16G)
> doesn't utilize our machines well.
>
> Is there a concurrent or parallel GC option that won't block all threads?
>
> Any thought is appreciated. Thanks.
>

Have you tried tuning the JVM at all?  What are the options that you
are running with?  You have GC logs enabled?   Post a few up on
pastebin?  As Mohamed asks, you've the slab allocator enabled?   What
are your configs like?  How many regions per server?  What size are
they?

St.Ack

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