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From Markus Jelsma <markus.jel...@openindex.io>
Subject RE: 7.2.1 cluster dies within minutes after restart
Date Fri, 02 Feb 2018 17:30:33 GMT
Hello S.G.

We have relied in Trie* fields every since they became available, i don't think reverting
to the old fieldType's will do us any good, we have a very recent problem.

Regarding our heap, the cluster ran fine for years with just 1.5 GB, we only recently increased
it because or data keeps on growing. Heap rarely goes higher than 50 %, except when this specific
problem occurs. The nodes have no problem processing a few hundred QPS continuously and can
go on for days, sometimes even a few weeks.

I will keep my eye open for other clues when the problem strikes again!

Thanks,
Markus

-----Original message-----
> From:S G <sg.online.email@gmail.com>
> Sent: Friday 2nd February 2018 18:20
> To: solr-user@lucene.apache.org
> Subject: Re: 7.2.1 cluster dies within minutes after restart
> 
> Yeah, definitely check the zookeeper version.
> 3.4.6 is not a good one I know and you can say the same for all the
> versions below it too.
> We have used 3.4.9 with no issues.
> While Solr 7.x uses 3.4.10
> 
> Another dimension could be the use or (dis-use) of p-fields like pint,
> plong etc.
> If you are using them, try to revert back to tint, tlong etc
> And if you are not using them, try to use them (Although doing this means a
> change from your older config and less likely to help).
> 
> Lastly, did I read 2 GB for JVM heap?
> That seems really too less to me for any version of Solr
> We run with 10-16 gb of heap with G1GC collector and new-gen capped at 3-4gb
> 
> 
> On Fri, Feb 2, 2018 at 4:27 AM, Markus Jelsma <markus.jelsma@openindex.io>
> wrote:
> 
> > Hello Ere,
> >
> > It appears that my initial e-mail [1] got lost in the thread. We don't
> > have GC issues, the cluster that dies occasionally runs, in general, smooth
> > and quick with just 2 GB allocated.
> >
> > Thanks,
> > Markus
> >
> > [1]: http://lucene.472066.n3.nabble.com/7-2-1-cluster-dies-
> > within-minutes-after-restart-td4372615.html
> >
> > -----Original message-----
> > > From:Ere Maijala <ere.maijala@helsinki.fi>
> > > Sent: Friday 2nd February 2018 8:49
> > > To: solr-user@lucene.apache.org
> > > Subject: Re: 7.2.1 cluster dies within minutes after restart
> > >
> > > Markus,
> > >
> > > I may be stating the obvious here, but I didn't notice garbage
> > > collection mentioned in any of the previous messages, so here goes. In
> > > our experience almost all of the Zookeeper timeouts etc. have been
> > > caused by too long garbage collection pauses. I've summed up my
> > > observations here:
> > > <https://www.mail-archive.com/solr-user@lucene.apache.org/msg135857.html
> > >
> > >
> > > So, in my experience it's relatively easy to cause heavy memory usage
> > > with SolrCloud with seemingly innocent queries, and GC can become a
> > > problem really quickly even if everything seems to be running smoothly
> > > otherwise.
> > >
> > > Regards,
> > > Ere
> > >
> > > Markus Jelsma kirjoitti 31.1.2018 klo 23.56:
> > > > Hello S.G.
> > > >
> > > > We do not complain about speed improvements at all, it is clear 7.x is
> > faster than its predecessor. The problem is stability and not recovering
> > from weird circumstances. In general, it is our high load cluster
> > containing user interaction logs that suffers the most. Our main text
> > search cluster - receiving much fewer queries - seems mostly unaffected,
> > except last Sunday. After very short but high burst of queries it entered
> > the same catatonic state the logs cluster usually dies from.
> > > >
> > > > The query burst immediately caused ZK timeouts and high heap
> > consumption (not sure which came first of the latter two). The query burst
> > lasted for 30 minutes, the excessive heap consumption continued for more
> > than 8 hours, before Solr finally realized it could relax. Most remarkable
> > was that Solr recovered on its own, ZK timeouts stopped, heap went back to
> > normal.
> > > >
> > > > There seems to be a causality between high load and this state.
> > > >
> > > > We really want to get this fixed for ourselves and everyone else that
> > may encounter this problem, but i don't know how, so i need much more
> > feedback and hints from those who have deep understanding of inner working
> > of Solrcloud and changes since 6.x.
> > > >
> > > > To be clear, we don't have the problem of 15 second ZK timeout, we use
> > 30. Is 30 too low still? Is it even remotely related to this problem? What
> > does load have to do with it?
> > > >
> > > > We are not able to reproduce it in lab environments. It can take
> > minutes after cluster startup for it to occur, but also days.
> > > >
> > > > I've been slightly annoyed by problems that can occur in a board time
> > span, it is always bad luck for reproduction.
> > > >
> > > > Any help getting further is much appreciated.
> > > >
> > > > Many thanks,
> > > > Markus
> > > >
> > > > -----Original message-----
> > > >> From:S G <sg.online.email@gmail.com>
> > > >> Sent: Wednesday 31st January 2018 21:48
> > > >> To: solr-user@lucene.apache.org
> > > >> Subject: Re: 7.2.1 cluster dies within minutes after restart
> > > >>
> > > >> We did some basic load testing on our 7.1.0 and 7.2.1 clusters.
> > > >> And that came out all right.
> > > >> We saw a performance increase of about 30% in read latencies between
> > 6.6.0
> > > >> and 7.1.0
> > > >> And then we saw a performance degradation of about 10% between 7.1.0
> > and
> > > >> 7.2.1 in many metrics.
> > > >> But overall, it still seems better than 6.6.0.
> > > >>
> > > >> I will check for the errors too in the logs but the nodes were
> > responsive
> > > >> for all the 23+ hours we did the load test.
> > > >>
> > > >> Disclaimer: We do not test facets and pivots or block-joins. And will
> > add
> > > >> those features to our load-testing tool sometime this year.
> > > >>
> > > >> Thanks
> > > >> SG
> > > >>
> > > >>
> > > >> On Wed, Jan 31, 2018 at 3:12 AM, Markus Jelsma <
> > markus.jelsma@openindex.io>
> > > >> wrote:
> > > >>
> > > >>> Ah thanks, i just submitted a patch fixing it.
> > > >>>
> > > >>> Anyway, in the end it appears this is not the problem we are seeing
> > as our
> > > >>> timeouts were already at 30 seconds.
> > > >>>
> > > >>> All i know is that at some point nodes start to lose ZK connections
> > due to
> > > >>> timeouts (logs say so, but all within 30 seconds), the logs are
> > flooded
> > > >>> with those messages:
> > > >>> o.a.z.ClientCnxn Client session timed out, have not heard from
> > server in
> > > >>> 10359ms for sessionid 0x160f9e723c12122
> > > >>> o.a.z.ClientCnxn Unable to reconnect to ZooKeeper service, session
> > > >>> 0x60f9e7234f05bb has expired
> > > >>>
> > > >>> Then there is a doubling in heap usage and nodes become
> > unresponsive, die
> > > >>> etc.
> > > >>>
> > > >>> We also see those messages in other collections, but not so
> > frequently and
> > > >>> they don't cause failure in those less loaded clusters.
> > > >>>
> > > >>> Ideas?
> > > >>>
> > > >>> Thanks,
> > > >>> Markus
> > > >>>
> > > >>> -----Original message-----
> > > >>>> From:Michael Braun <n3ca88@gmail.com>
> > > >>>> Sent: Monday 29th January 2018 21:09
> > > >>>> To: solr-user@lucene.apache.org
> > > >>>> Subject: Re: 7.2.1 cluster dies within minutes after restart
> > > >>>>
> > > >>>> Believe this is reported in https://issues.apache.org/
> > > >>> jira/browse/SOLR-10471
> > > >>>>
> > > >>>>
> > > >>>> On Mon, Jan 29, 2018 at 2:55 PM, Markus Jelsma <
> > > >>> markus.jelsma@openindex.io>
> > > >>>> wrote:
> > > >>>>
> > > >>>>> Hello SG,
> > > >>>>>
> > > >>>>> The default in solr.in.sh is commented so it defaults
to the value
> > > >>> set in
> > > >>>>> bin/solr, which is fifteen seconds. Just uncomment the
setting in
> > > >>>>> solr.in.sh and your timeout will be thirty seconds.
> > > >>>>>
> > > >>>>> For Solr itself to really default to thirty seconds, Solr's
> > bin/solr
> > > >>> needs
> > > >>>>> to be patched to use the correct value.
> > > >>>>>
> > > >>>>> Regards,
> > > >>>>> Markus
> > > >>>>>
> > > >>>>> -----Original message-----
> > > >>>>>> From:S G <sg.online.email@gmail.com>
> > > >>>>>> Sent: Monday 29th January 2018 20:15
> > > >>>>>> To: solr-user@lucene.apache.org
> > > >>>>>> Subject: Re: 7.2.1 cluster dies within minutes after
restart
> > > >>>>>>
> > > >>>>>> Hi Markus,
> > > >>>>>>
> > > >>>>>> We are in the process of upgrading our clusters to
7.2.1 and I am
> > not
> > > >>>>> sure
> > > >>>>>> I quite follow the conversation here.
> > > >>>>>> Is there a simple workaround to set the ZK_CLIENT_TIMEOUT
to a
> > higher
> > > >>>>> value
> > > >>>>>> in the config (and it's just a default value being
> > wrong/overridden
> > > >>>>>> somewhere)?
> > > >>>>>> Or is it more severe in the sense that any config
set for
> > > >>>>> ZK_CLIENT_TIMEOUT
> > > >>>>>> by the user is just ignored completely by Solr in
7.2.1 ?
> > > >>>>>>
> > > >>>>>> Thanks
> > > >>>>>> SG
> > > >>>>>>
> > > >>>>>>
> > > >>>>>> On Mon, Jan 29, 2018 at 3:09 AM, Markus Jelsma <
> > > >>>>> markus.jelsma@openindex.io>
> > > >>>>>> wrote:
> > > >>>>>>
> > > >>>>>>> Ok, i applied the patch and it is clear the timeout
is 15000.
> > > >>> Solr.xml
> > > >>>>>>> says 30000 if ZK_CLIENT_TIMEOUT is not set, which
is by default
> > > >>> unset
> > > >>>>> in
> > > >>>>>>> solr.in.sh,but set in bin/solr to 15000. So it
seems Solr's
> > > >>> default is
> > > >>>>>>> still 15000, not 30000.
> > > >>>>>>>
> > > >>>>>>> But, back to my topic. I see we explicitly set
it in solr.in.sh
> > to
> > > >>>>> 30000.
> > > >>>>>>> To be sure, i applied your patch to a production
machine, all our
> > > >>>>>>> collections run with 30000. So how would that
explain this log
> > > >>> line?
> > > >>>>>>>
> > > >>>>>>> o.a.z.ClientCnxn Client session timed out, have
not heard from
> > > >>> server
> > > >>>>> in
> > > >>>>>>> 22130ms
> > > >>>>>>>
> > > >>>>>>> We also see these with smaller values, seven seconds.
And, is
> > this
> > > >>>>>>> actually an indicator of the problems we have?
> > > >>>>>>>
> > > >>>>>>> Any ideas?
> > > >>>>>>>
> > > >>>>>>> Many thanks,
> > > >>>>>>> Markus
> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>>> -----Original message-----
> > > >>>>>>>> From:Markus Jelsma <markus.jelsma@openindex.io>
> > > >>>>>>>> Sent: Saturday 27th January 2018 10:03
> > > >>>>>>>> To: solr-user@lucene.apache.org
> > > >>>>>>>> Subject: RE: 7.2.1 cluster dies within minutes
after restart
> > > >>>>>>>>
> > > >>>>>>>> Hello,
> > > >>>>>>>>
> > > >>>>>>>> I grepped for it yesterday and found nothing
but 30000 in the
> > > >>>>> settings,
> > > >>>>>>> but judging from the weird time out value, you
may be right. Let
> > me
> > > >>>>> apply
> > > >>>>>>> your patch early next week and check for spurious
warnings.
> > > >>>>>>>>
> > > >>>>>>>> Another note worthy observation for those
working on cloud
> > > >>> stability
> > > >>>>> and
> > > >>>>>>> recovery, whenever this happens, some nodes are
also absolutely
> > > >>> sure
> > > >>>>> to run
> > > >>>>>>> OOM. The leaders usually live longest, the replica's
don't, their
> > > >>> heap
> > > >>>>>>> usage peaks every time, consistently.
> > > >>>>>>>>
> > > >>>>>>>> Thanks,
> > > >>>>>>>> Markus
> > > >>>>>>>>
> > > >>>>>>>> -----Original message-----
> > > >>>>>>>>> From:Shawn Heisey <apache@elyograg.org>
> > > >>>>>>>>> Sent: Saturday 27th January 2018 0:49
> > > >>>>>>>>> To: solr-user@lucene.apache.org
> > > >>>>>>>>> Subject: Re: 7.2.1 cluster dies within
minutes after restart
> > > >>>>>>>>>
> > > >>>>>>>>> On 1/26/2018 10:02 AM, Markus Jelsma wrote:
> > > >>>>>>>>>> o.a.z.ClientCnxn Client session timed
out, have not heard
> > > >>> from
> > > >>>>>>> server in 22130ms (although zkClientTimeOut is
30000).
> > > >>>>>>>>>
> > > >>>>>>>>> Are you absolutely certain that there
is a setting for
> > > >>>>> zkClientTimeout
> > > >>>>>>>>> that is actually getting applied?  The
default value in Solr's
> > > >>>>> example
> > > >>>>>>>>> configs is 30 seconds, but the internal
default in the code
> > > >>> (when
> > > >>>>> no
> > > >>>>>>>>> configuration is found) is still 15. 
I have confirmed this in
> > > >>> the
> > > >>>>>>> code.
> > > >>>>>>>>>
> > > >>>>>>>>> Looks like SolrCloud doesn't log the values
it's using for
> > > >>> things
> > > >>>>> like
> > > >>>>>>>>> zkClientTimeout.  I think it should.
> > > >>>>>>>>>
> > > >>>>>>>>> https://issues.apache.org/jira/browse/SOLR-11915
> > > >>>>>>>>>
> > > >>>>>>>>> Thanks,
> > > >>>>>>>>> Shawn
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>
> > > >>>>>>
> > > >>>>>
> > > >>>>
> > > >>>
> > > >>
> > >
> > > --
> > > Ere Maijala
> > > Kansalliskirjasto / The National Library of Finland
> > >
> >
> 

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