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Date: Fri, 26 Jun 2015 18:10:45 -0700
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 <CAMUR=WjvX2Y7MpWm9CwbZsK70uN22ggk6TshvuvhmmemNW2q2w@mail.gmail.com>
Subject: Re: Tracking down possible network partition
From: =?UTF-8?B?UmHDumwgR3V0acOpcnJleiBTZWdhbMOpcw==?= <rgs@itevenworks.net>
To: "user@zookeeper.apache.org" <user@zookeeper.apache.org>
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On 25 June 2015 at 07:28, Round, Mark <Mark.Round@sky.uk> wrote:

> I have a 5-node Zookeeper 3.4.6 cluster across 3 data centres (2
> zookeepers in each =E2=80=9Cmain=E2=80=9D DC, and a 5th in a 3rd DC for q=
uorum). I see that
> the two nodes in one DC have regular =E2=80=9Cissues=E2=80=9D where they =
get kicked out of
> the cluster and the ZooKeeperServer process stops for a few minutes until
> the node rejoins. I=E2=80=99d like to know a couple of things, if someone=
 could
> please point me in the direction of the relevant docs I=E2=80=99d greatly
> appreciate it.
>
> 1.) Is it expected behaviour that when a node is kicked from the cluster,
> it will not be allowed to re-join for a period ? From the logs below I ca=
n
> see that re-establishing a valid cluster took around 15 minutes.
>

I don't think so.

2.) It appears that the leader closes connections to the affected followers
> after a =E2=80=9Ctransaction timeout=E2=80=9D occurs. Where would I find =
out what this
> timeout is ? Is this the same thing as a session timout (e.g. The default
> of 20 * tickTime) ?
>

https://github.com/apache/zookeeper/blob/trunk/src/java/main/org/apache/zoo=
keeper/server/quorum/LearnerHandler.java#L496


> 3.) Where can I find the definition of the different fields in the
> election log messages (I.e. What are =E2=80=9Cn.round=E2=80=9D, =E2=80=9C=
n.zxid=E2=80=9D, =E2=80=9Cn.state=E2=80=9D and so
> on) ?


Not sure if there's a better source than the source:
https://github.com/apache/zookeeper/blob/trunk/src/java/main/org/apache/zoo=
keeper/server/quorum/FastLeaderElection.java#L687


-rgs

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