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From: Erick Erickson <erickerickson@gmail.com>
Date: Mon, 16 May 2016 20:56:28 -0700
Message-ID: <CAN4YXvekxojoU0VSKLxTqgmWTs5rao35Be2ivVLEtANDRUVPZg@mail.gmail.com>
Subject: Re: state.json being downloaded every 10 seconds
To: solr-user <solr-user@lucene.apache.org>
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archived-at: Tue, 17 May 2016 03:57:01 -0000

With the per-collection state.json, if "something" goes to a node that does=
n't
host a replica for a node, it downloads the state for the "other"
collection then
throws it away.

In this case, "something" is apparently asking the nodes hosting collection=
A to
do "something" with collections B and/or C. Some support for this would
be if further investigation shows that the nodes that _do_ re-download the
info did _not_ have replicas B and C.

What the "something" is that sends requests I'm not quite sure, but
that's a place
to start.

Best,
Erick

On Mon, May 16, 2016 at 11:08 AM, Jeff Wartes <jwartes@whitepages.com> wrot=
e:
>
> I have a solr 5.4 cluster with three collections, A, B, C.
> Nodes either host replicas for collection A, or B and C. Collections B an=
d C are not currently used - no inserts or queries. Collection A is getting=
 significant query traffic, but no insert traffic, and queries are only dir=
ected to nodes hosting replicas for collection A. ZK timeout is set to 15 s=
econds.
>
> I=E2=80=99ve noticed via tcpdump that, every 10 seconds exactly, several =
of the nodes (but not all) hosting collection A re-download the state.json =
for collections B and C. This behavior survives JVM restart.
>
> This isn=E2=80=99t a huge deal, the extra traffic isn=E2=80=99t very mean=
ingful, but it=E2=80=99s odd and smells like a bug somewhere. Anyone seen s=
omething like this?
>
>