Replication of a corrupt master index

["Charra, Johannes" <Jo...@haufe-lexware.com>]

Hi,

If I have a master/slave setup and the master index gets corrupted, will the slaves realize they should not replicate from the master anymore, since the master does not have a newer index version?

I'm using Solr version 4.2.1.

Regards,
Johannes

Re: Replication of a corrupt master index

[Erick Erickson <er...@gmail.com>]

If nothing else, the disk underlying the index could have a bad spot...

There have been some corrupt index bugs in the past, but they always
get a super-high priority for fixing so don't hang around for long.

You can always take periodic backups. Perhaps the slickest way to do that
is to set up a slave that does nothing but poll once/day. Since you know
that's not changing, you can do simple disk copies of the index and at least
minimize your possible outage.

Now, all that said you may wan to consider SolrCloud. The advantage there is
that each node gets the raw input and very rarely does replication. Failover
is as simple in that scenario as killing the bad node and things "just work".

Best,
Erick

On Tue, Dec 2, 2014 at 7:40 AM, Charra, Johannes
<Jo...@haufe-lexware.com> wrote:
> Thanks for your response, Erick.
>
> Do you think it is possible to corrupt an index merely with HTTP requests? I've been using the aforementioned m/s setup for years now and have never seen a master failure.
>
> I'm trying to think of scenarios where this setup (1 master, 4 slaves) might have a total outage. The master runs on a h/a cluster.
>
> Regards,
> Johannes
>
> -----Ursprüngliche Nachricht-----
> Von: Erick Erickson [mailto:erickerickson@gmail.com]
> Gesendet: Dienstag, 2. Dezember 2014 15:54
> An: solr-user@lucene.apache.org
> Betreff: Re: Replication of a corrupt master index
>
> No. The master is the master and will always stay the master unless you change it. This is one of the reasons I really like to keep the original source around in case I every have this problem.
>
> Best,
> Erick
>
> On Tue, Dec 2, 2014 at 2:34 AM, Charra, Johannes <Jo...@haufe-lexware.com> wrote:
>>
>> Hi,
>>
>> If I have a master/slave setup and the master index gets corrupted, will the slaves realize they should not replicate from the master anymore, since the master does not have a newer index version?
>>
>> I'm using Solr version 4.2.1.
>>
>> Regards,
>> Johannes
>>
>>

AW: Replication of a corrupt master index

["Charra, Johannes" <Jo...@haufe-lexware.com>]

Thanks for your response, Erick. 

Do you think it is possible to corrupt an index merely with HTTP requests? I've been using the aforementioned m/s setup for years now and have never seen a master failure.

I'm trying to think of scenarios where this setup (1 master, 4 slaves) might have a total outage. The master runs on a h/a cluster.

Regards,
Johannes

-----Ursprüngliche Nachricht-----
Von: Erick Erickson [mailto:erickerickson@gmail.com] 
Gesendet: Dienstag, 2. Dezember 2014 15:54
An: solr-user@lucene.apache.org
Betreff: Re: Replication of a corrupt master index

No. The master is the master and will always stay the master unless you change it. This is one of the reasons I really like to keep the original source around in case I every have this problem.

Best,
Erick

On Tue, Dec 2, 2014 at 2:34 AM, Charra, Johannes <Jo...@haufe-lexware.com> wrote:
>
> Hi,
>
> If I have a master/slave setup and the master index gets corrupted, will the slaves realize they should not replicate from the master anymore, since the master does not have a newer index version?
>
> I'm using Solr version 4.2.1.
>
> Regards,
> Johannes
>
>

Re: Replication of a corrupt master index

[Erick Erickson <er...@gmail.com>]

No. The master is the master and will always stay the master
unless you change it. This is one of the reasons I really like
to keep the original source around in case I every have this
problem.

Best,
Erick

On Tue, Dec 2, 2014 at 2:34 AM, Charra, Johannes
<Jo...@haufe-lexware.com> wrote:
>
> Hi,
>
> If I have a master/slave setup and the master index gets corrupted, will the slaves realize they should not replicate from the master anymore, since the master does not have a newer index version?
>
> I'm using Solr version 4.2.1.
>
> Regards,
> Johannes
>
>