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From Stephen Weiss <Steve.We...@wgsn.com>
Subject Re: Challenges with new Solrcloud Backup/Restore functionality
Date Tue, 08 Nov 2016 20:54:59 GMT
Just wanted to note that we tested out the patch from SOLR-9527 and it worked perfectly for
the balancing issue - thank you so much for that!

As for issue #2, we've resorted to doing a hard commit, stopping all indexing against the
index, and then taking the backup, and we have a reasonably good success rate with that. 
The system is set up to automatically delete and retry the backup/restore process if the cores
don't match, so that's allowed us to smooth over that problem and get this process out into
production.   We've been using it for several weeks now without any major issue!

We just looked because Solr 6.3 was out, and wanted to know if we could upgrade without patching
again, but it appears this ticket hasn't gone anywhere yet.  I know one users' testing is
probably not enough, but given that it seems the patch works just fine, are there any plans
to merge it into release yet?

--
Steve

On Tue, Oct 4, 2016 at 6:46 PM, Stephen Lewis <slewis@panopto.com<mailto:slewis@panopto.com>>
wrote:
Hi All,

I have been experiencing error#1 too with the current branch_6_2 build. I started noticing
after I applied my patch to that branch<https://issues.apache.org/jira/browse/SOLR-9527>
(on issue #2), but it appears to occur without the patch as well. I haven't seen this issue
with solr 6.1.0 despite extensive testing. I haven't confirmed if this occurs on the official
6.2.0 release build. I will try to confirm and gather more data soon.

As with Stephen Weiss, I also am not seeing any errors logged in the index after backup and
the task is marked as succeeded. However, after each backup which is missing a large amount
of data, the restore command fails, in the sense that the collection is created, but the initialized
cores are blank and the logs contain errors about "incomplete segments". I will try to research
further and get back with more data soon.



On Mon, Sep 26, 2016 at 11:26 AM, Hrishikesh Gadre <gadre.solr@gmail.com<mailto:gadre.solr@gmail.com>>
wrote:
Hi Stephen,

regarding #1, can you verify following steps during backup/restore?

- Before backup command, make sure to run a "hard" commit on the original
collection. The backup operation will capture only hard committed data.
- After restore command, check the Solr web UI to verify that all replicas
of the new (or restored) collection are in the "active" state. During my
testing, I found that when one or more replicas are in "recovery" state,
the doc count of the restored collection doesn't match the doc count of the
original collection. But after the recovery is complete, the doc counts
match. I will file a JIRA to fix this issue.

Thanks
Hrishikesh

On Mon, Sep 26, 2016 at 9:34 AM, Stephen Weiss <Steve.Weiss@wgsn.com<mailto:Steve.Weiss@wgsn.com>>
wrote:

> #2 - that's great news.  I'll try to patch it in and test it out.
>
> #1 - In all cases, the backup and restore both appear successful.  There
> are no failure messages for any of the shards, no warnings, etc - I didn't
> even realize at first that data was missing until I noticed differences in
> some of the query results when we were testing.  Either manual restore of
> the data or using the restore API (with all data on one node), we see the
> same, so I think it's more a problem in the backup process than the restore
> process.
>
> If there's any kind of debugging output we can provide that can help solve
> this, let me know.
>
> --
> Steve
>
> On Sun, Sep 25, 2016 at 7:17 PM, Hrishikesh Gadre <gadre.solr@gmail.com<mailto:gadre.solr@gmail.com>>
> wrote:
>
>> Hi Steve,
>>
>> Regarding the 2nd issue, a JIRA is already created and patch is uploaded
>> (SOLR-9527). Can someone review and commit the patch?
>>
>> Regarding 1st issue, does backup command succeeds? Also do you see any
>> warning/error log messages? How about the restore command?
>>
>> Thanks
>> Hrishikesh
>>
>>
>>
>> On Sat, Sep 24, 2016 at 12:14 PM, Stephen Weiss <Steve.Weiss@wgsn.com<mailto:Steve.Weiss@wgsn.com>>
>> wrote:
>>
>>> Hi everyone,
>>>
>>> We're very excited about SolrCloud's new backup / restore collection
>>> APIs, which should introduce some major new efficiencies into our indexing
>>> workflow.  Unfortunately, we've run into some snags with it that are
>>> preventing us from moving into production.  I was hoping someone on the
>>> list could help.
>>>
>>> 1) Data inconsistencies
>>>
>>> There seems to be a problem getting all the data consistently.
>>> Sometimes, the backup will contain all of the data in the collection, and
>>> sometimes, large portions of the collection (as much as 40%) will be
>>> missing.  We haven't quite figured out what might cause this yet, although
>>> one thing I've noticed is the chances of success are greater when we are
>>> only backing up one collection at a time.  Unfortunately, for our workflow,
>>> it will be difficult to make that work, and there still doesn't seem to be
>>> a guarantee of success either way.
>>>
>>> 2) Shards are not distributed
>>>
>>> To make matters worse, for some reason, any type of restore operation
>>> always seems to put all shards of the collection on the same node.  We've
>>> tried setting maxShardsPerNode to 1 in the restore command, but this has no
>>> effect.  We are seeing the same behavior on both 6.1 and 6.2.1.  No matter
>>> what we do, all the shards always go to the same node - and it's not even
>>> the node that we execute the restore request on, but oddly enough, a
>>> totally different node, and always the same one (the 4th one).  It should
>>> be noted that all nodes of our 8 node cloud are up and totally functional
>>> when this happens.
>>>
>>> To work around this, we wrote up a quick script to create an empty
>>> collection, which always distributes itself across the cloud quite well
>>> (another indication that there's nothing wrong with the nodes themselves),
>>> and then we rsync the individual shards' data into the empty shards and
>>> reload the collection.  This works fine, however, because of the data
>>> inconsistencies mentioned above, we can't really move forward anyway.
>>>
>>>
>>> Problem #2, we have a reasonable workaround for, but problem #1 we do
>>> not.  If anyone has any thoughts about either of these problems, I would be
>>> very grateful.  Thanks!
>>>
>>> --
>>> Steve
>>>
>>> ________________________________
>>>
>>> WGSN is a global foresight business. Our experts provide deep insight
>>> and analysis of consumer, fashion and design trends. We inspire our clients
>>> to plan and trade their range with unparalleled confidence and accuracy.
>>> Together, we Create Tomorrow.
>>>
>>> WGSN<http://www.wgsn.com/> is part of WGSN Limited, comprising of
>>> market-leading products including WGSN.com<http://www.wgsn.com>, WGSN
>>> Lifestyle & Interiors<http://www.wgsn.com/en/lifestyle-interiors>,
WGSN
>>> INstock<http://www.wgsninstock.com/>, WGSN StyleTrial<
>>> http://www.wgsn.com/en/styletrial/> and WGSN Mindset<
>>> http://www.wgsn.com/en/services/consultancy/>, our bespoke consultancy
>>> services.
>>>
>>> The information in or attached to this email is confidential and may be
>>> legally privileged. If you are not the intended recipient of this message,
>>> any use, disclosure, copying, distribution or any action taken in reliance
>>> on it is prohibited and may be unlawful. If you have received this message
>>> in error, please notify the sender immediately by return email and delete
>>> this message and any copies from your computer and network. WGSN does not
>>> warrant that this email and any attachments are free from viruses and
>>> accepts no liability for any loss resulting from infected email
>>> transmissions.
>>>
>>> WGSN reserves the right to monitor all email through its networks. Any
>>> views expressed may be those of the originator and not necessarily of WGSN.
>>> WGSN is powered by Ascential plc<http://www.ascential.com>, which
>>> transforms knowledge businesses to deliver exceptional performance.
>>>
>>> Please be advised all phone calls may be recorded for training and
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>>> acknowledge and agree to calls being recorded.
>>>
>>> WGSN Limited, Company number 4858491
>>>
>>> registered address:
>>>
>>> Ascential plc, The Prow, 1 Wilder Walk, London W1B 5AP
>>>
>>> WGSN Inc., tax ID 04-3851246, registered office c/o National Registered
>>> Agents, Inc., 160 Greentree Drive, Suite 101, Dover DE 19904, United States
>>>
>>> 4C Serviços de Informação Ltda., CNPJ/MF (Taxpayer's Register):
>>> 15.536.968/0001-04, Address: Avenida Cidade Jardim, 377, 7˚ andar CEP
>>> 01453-000, Itaim Bibi, São Paulo
>>>
>>> 4C Business Information Consulting (Shanghai) Co., Ltd,
>>> 富新商务信息咨询(上海)有限公司, registered address Unit 4810/4811,
48/F Tower 1, Grand
>>> Gateway, 1 Hong Qiao Road, Xuhui District, Shanghai
>>>
>>
>>
>
> ------------------------------

>
> WGSN is a global foresight business. Our experts provide deep insight and
> analysis of consumer, fashion and design trends. We inspire our clients to
> plan and trade their range with unparalleled confidence and accuracy.
> Together, we Create Tomorrow.
>
> WGSN <http://www.wgsn.com/> is part of WGSN Limited, comprising of
> market-leading products including WGSN.com <http://www.wgsn.com>, WGSN
> Lifestyle & Interiors <http://www.wgsn.com/en/lifestyle-interiors>, WGSN
> INstock <http://www.wgsninstock.com/>, WGSN StyleTrial
> <http://www.wgsn.com/en/styletrial/> and WGSN Mindset
> <http://www.wgsn.com/en/services/consultancy/>, our bespoke consultancy
> services.
>
> The information in or attached to this email is confidential and may be
> legally privileged. If you are not the intended recipient of this message,
> any use, disclosure, copying, distribution or any action taken in reliance
> on it is prohibited and may be unlawful. If you have received this message
> in error, please notify the sender immediately by return email and delete
> this message and any copies from your computer and network. WGSN does not
> warrant that this email and any attachments are free from viruses and
> accepts no liability for any loss resulting from infected email
> transmissions.
>
> WGSN reserves the right to monitor all email through its networks. Any
> views expressed may be those of the originator and not necessarily of WGSN.
> WGSN is powered by Ascential plc <http://www.ascential.com>, which
> transforms knowledge businesses to deliver exceptional performance.
>
> Please be advised all phone calls may be recorded for training and quality
> purposes and by accepting and/or making calls from and/or to us you
> acknowledge and agree to calls being recorded.
>
> WGSN Limited, Company number 4858491
>
> registered address:
>
> Ascential plc, The Prow, 1 Wilder Walk, London W1B 5AP
>
> WGSN Inc., tax ID 04-3851246, registered office c/o National Registered
> Agents, Inc., 160 Greentree Drive, Suite 101, Dover DE 19904, United States
>
> 4C Serviços de Informação Ltda., CNPJ/MF (Taxpayer's Register):
> 15.536.968/0001-04, Address: Avenida Cidade Jardim, 377, 7˚ andar CEP
> 01453-000, Itaim Bibi, São Paulo
>
> 4C Business Information Consulting (Shanghai) Co., Ltd, 富新商务信息咨询(上海)有限公司,
> registered address Unit 4810/4811, 48/F Tower 1, Grand Gateway, 1 Hong Qiao
> Road, Xuhui District, Shanghai
>



--
Stephen

(206)753-9320<tel:%28206%29753-9320>
stephen-lewis.net<http://stephen-lewis.net>


________________________________

WGSN is a global foresight business. Our experts provide deep insight and analysis of consumer,
fashion and design trends. We inspire our clients to plan and trade their range with unparalleled
confidence and accuracy. Together, we Create Tomorrow.

WGSN<http://www.wgsn.com/> is part of WGSN Limited, comprising of market-leading products
including WGSN.com<http://www.wgsn.com>, WGSN Lifestyle & Interiors<http://www.wgsn.com/en/lifestyle-interiors>,
WGSN INstock<http://www.wgsninstock.com/>, WGSN StyleTrial<http://www.wgsn.com/en/styletrial/>
and WGSN Mindset<http://www.wgsn.com/en/services/consultancy/>, our bespoke consultancy
services.

The information in or attached to this email is confidential and may be legally privileged.
If you are not the intended recipient of this message, any use, disclosure, copying, distribution
or any action taken in reliance on it is prohibited and may be unlawful. If you have received
this message in error, please notify the sender immediately by return email and delete this
message and any copies from your computer and network. WGSN does not warrant that this email
and any attachments are free from viruses and accepts no liability for any loss resulting
from infected email transmissions.

WGSN reserves the right to monitor all email through its networks. Any views expressed may
be those of the originator and not necessarily of WGSN. WGSN is powered by Ascential plc<http://www.ascential.com>,
which transforms knowledge businesses to deliver exceptional performance.

Please be advised all phone calls may be recorded for training and quality purposes and by
accepting and/or making calls from and/or to us you acknowledge and agree to calls being recorded.

WGSN Limited, Company number 4858491

registered address:

Ascential plc, The Prow, 1 Wilder Walk, London W1B 5AP

WGSN Inc., tax ID 04-3851246, registered office c/o National Registered Agents, Inc., 160
Greentree Drive, Suite 101, Dover DE 19904, United States

4C Serviços de Informação Ltda., CNPJ/MF (Taxpayer's Register): 15.536.968/0001-04, Address:
Avenida Cidade Jardim, 377, 7˚ andar CEP 01453-000, Itaim Bibi, São Paulo

4C Business Information Consulting (Shanghai) Co., Ltd, 富新商务信息咨询(上海)有限公司,
registered address Unit 4810/4811, 48/F Tower 1, Grand Gateway, 1 Hong Qiao Road, Xuhui District,
Shanghai

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