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Date: Mon, 2 Mar 2015 11:15:18 -0800
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 <CAEDUwd2AcKZ+RAT6bBwThwpv+xpwBTWZeLVomj01TUXYR2MBWg@mail.gmail.com>
Subject: Re: does need to disable 'rpc_keepalive' if 'rpc_max_threads' is get
 larger?
From: Robert Coli <rcoli@eventbrite.com>
To: "user@cassandra.apache.org" <user@cassandra.apache.org>
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On Sun, Mar 1, 2015 at 6:40 PM, pprun <pprun.dragon@gmail.com> wrote:

> rpc_max_threads is set to 2048 and the 'rpc_server_type' is 'hsha', after
> 2 days running, observed that there's a high I/O activity and the number of
> 'RCP thread' grow to '2048' and VisualVm shows most of them is
> 'waiting'/'sleeping' (color: yellow).
>
> I want to know if I set rpc_keepalive to false, disable it, this will help
> to shrink the idle rpc threads?
>
> I remembered java 8 comes with newWorkStealingPool: number of threads may
> grow and shrink dynamically.
>

What version of Cassandra, and hsha or sync? How many client threads do you
have?

=Rob

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On S=
un, Mar 1, 2015 at 6:40 PM, pprun <span dir=3D"ltr">&lt;<a href=3D"mailto:p=
prun.dragon@gmail.com" target=3D"_blank">pprun.dragon@gmail.com</a>&gt;</sp=
an> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex">rpc_max_threads is set to 2048=
 and the &#39;rpc_server_type&#39; is &#39;hsha&#39;, after 2 days running,=
 observed that there&#39;s a high I/O activity and the number of &#39;RCP t=
hread&#39; grow to &#39;2048&#39; and VisualVm shows most of them is &#39;w=
aiting&#39;/&#39;sleeping&#39; (color: yellow).<br>
<br>
I want to know if I set rpc_keepalive to false, disable it, this will help =
to shrink the idle rpc threads?<br>
<br>
I remembered java 8 comes with newWorkStealingPool: number of threads may g=
row and shrink dynamically.<br></blockquote><div><br></div><div>What versio=
n of Cassandra, and hsha or sync? How many client threads do you have?</div=
><div><br></div><div>=3DRob</div><div>=C2=A0</div></div></div></div>

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