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From Alessandro Benedetti <benedetti.ale...@gmail.com>
Subject Re: simple test on solr 5.2.1 wrong leader elected on startup
Date Thu, 15 Oct 2015 15:42:21 GMT
Hi Matteo,

On 15 October 2015 at 16:16, Matteo Grolla <matteo.grolla@gmail.com> wrote:

> Hi,
>       I'm doing this test
> collection test is replicated on two solr nodes running on 8983, 8984
> using external zk
>
> 1)turn OFF solr 8984
> 2)add,commit a doc x con solr 8983
> 3)turn OFF solr 8983
> 4)turn ON solr 8984
>
At this point 8984 will be elected leader, because only element in the
cluster, it can not do anything to recover, so it will not replicate Doc x

> 5)shortly after (leader still not elected) turn ON solr 8983
>
I assume that even if you are not able to see it, actually the leader
election was already starting, not taking in consideration 8983

> 6)8984 is elected as leader
>
As expected

> 7)doc x is present on 8983 but not on 8984 (check issuing a query)
>
This is expected as well.

It is a very edge case, but i expect at the current status, the behaviour
you are obtaining is the expected one.
Probably the leader election should become smarter, for example, any time a
node came back to the cluster it should be checked, and in the case it
should be the leader a new election triggered.
Just thinking loud :)



>
> attached are the logs of both solr
>
> BTW I'm using java 1.8.045 on osx yosemite and solr 5.2.1 seems much
> slower to startup than solr 4.10.3. it seems waiting on something
>

I can not see any attached file, do you have any suggester in place ?
Anyway is weird as I assume you kept the solrconfig.xml the same.
Can you list the components you are currently using ?

Cheers



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Benedetti Alessandro
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