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Date: Tue, 9 Jul 2013 16:17:37 -0700
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Subject: Re: ZkHelixAdmin getResourceExternalView
From: Lance Co Ting Keh <lance@box.com>
To: user@helix.incubator.apache.org
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Hi Kishore,

I would love to do so. I am rushing to finish something for Box right now
but I'll look to do it before I go back/right when i go back to school.


Thank you
Lance


On Mon, Jul 8, 2013 at 3:24 PM, kishore g <g.kishore@gmail.com> wrote:

> Hi Lance,
>
> Look at the Routing table provider code, it sets up a watch on the
> external view and updates the local cache on demand. You can do similar
> stuff on LiveInstance as well.
>
> There is a generic class called ZKCachedDataAccessor which keeps local
> cache for a path and updates the cache only when something changes. It is
> fairly low level, it will be nice to have a high level api to satisfy your
> requirement. Let me know if you want to file a JIRA and contribute it.
>
> thanks,
> Kishore G
>
>
> On Mon, Jul 8, 2013 at 1:06 PM, Lance Co Ting Keh <lance@box.com> wrote:
>
>> Hi guys,
>>
>> Quick question on ZKHelixAdmin's getResourceExternalView, and other
>> method calls for information in Zookeeper. I checked the code base and it
>> seems that for every call we go to Zookeeper to get the info. I just want
>> to make sure that I am right on this. Is nothing cached in the
>> participant's memory? If so and i want to make an extra health check from
>> the non-JVM participant to make sure the non-JVM participant how can I best
>> do this without overloading Zookeeper?
>>
>>
>> Sincerely,
>> Lance
>>
>
>

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<div dir=3D"ltr">Hi Kishore,<div><br></div><div style>I would love to do so=
. I am rushing to finish something for Box right now but I&#39;ll look to d=
o it before I go back/right when i go back to school.</div><div style><br>
</div><div style><br></div><div style>Thank you</div><div style>Lance</div>=
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Mon,=
 Jul 8, 2013 at 3:24 PM, kishore g <span dir=3D"ltr">&lt;<a href=3D"mailto:=
g.kishore@gmail.com" target=3D"_blank">g.kishore@gmail.com</a>&gt;</span> w=
rote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi Lance,<div><br></div><di=
v>Look at the Routing table provider code, it sets up a watch on the extern=
al view and updates the local cache on demand. You can do similar stuff on =
LiveInstance as well.</div>

<div><br></div><div>There is a generic class called ZKCachedDataAccessor wh=
ich keeps local cache for a path and updates the cache only when something =
changes. It is fairly low level, it will be nice to have a high level api t=
o satisfy your requirement. Let me know if you want to file a JIRA and cont=
ribute it.</div>

<div><br></div><div>thanks,</div><div>Kishore G</div></div><div class=3D"HO=
EnZb"><div class=3D"h5"><div class=3D"gmail_extra"><br><br><div class=3D"gm=
ail_quote">On Mon, Jul 8, 2013 at 1:06 PM, Lance Co Ting Keh <span dir=3D"l=
tr">&lt;<a href=3D"mailto:lance@box.com" target=3D"_blank">lance@box.com</a=
>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi guys,<div><br></div><div=
>Quick question on ZKHelixAdmin&#39;s getResourceExternalView, and other me=
thod calls for information in Zookeeper. I checked the code base and it see=
ms that for every call we go to Zookeeper to get the info. I just want to m=
ake sure that I am right on this. Is nothing cached in the participant&#39;=
s memory? If so and i want to make an extra health check from the non-JVM p=
articipant to make sure the non-JVM participant how can I best do this with=
out overloading Zookeeper?</div>


<div><br></div><div><br></div><div>Sincerely,</div><div>Lance=A0</div></div=
>
</blockquote></div><br></div>
</div></div></blockquote></div><br></div>

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