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From Kais Ahmed <k...@neteck-fr.com>
Subject Re: Lost data after expanding cluster c* 1.2.3-1
Date Thu, 04 Apr 2013 09:21:05 GMT
Hi aaron,

I ran the command "nodetool rebuild_index host keyspace cf" on all the
nodes, in the log i see :

INFO [RMI TCP Connection(5422)-10.34.139.xxx] 2013-04-04 08:31:53,641
ColumnFamilyStore.java (line 558) User Requested secondary index re-build
for ...

but nothing's happening, how can i monitor the progress? and how can i know
when it's finished?

Thanks,


2013/4/2 aaron morton <aaron@thelastpickle.com>

> The problem come from that i don't put  auto_boostrap to true for the new
> nodes, not in this documentation (
> http://www.datastax.com/docs/1.2/install/expand_ami)
>
> auto_bootstrap defaults to True if not specified in the yaml.
>
> can i do that at any time, or when the cluster are not loaded
>
> Not sure what the question is.
> Both those operations are online operations you can do while the node is
> processing requests.
>
> Cheers
>
> -----------------
> Aaron Morton
> Freelance Cassandra Consultant
> New Zealand
>
> @aaronmorton
> http://www.thelastpickle.com
>
> On 1/04/2013, at 9:26 PM, Kais Ahmed <kais@neteck-fr.com> wrote:
>
> > At this moment the errors started, we see that members and other data
> are gone, at this moment the nodetool status return (in red color the 3 new
> nodes)
> > What errors?
> The errors was in my side in the application, not cassandra errors
>
> > I put for each of them seeds = A ip, and start each with two minutes
> intervals.
> > When I'm making changes I tend to change a single node first, confirm
> everything is OK and then do a bulk change.
> Thank you for that advice.
>
> >I'm not sure what or why it went wrong, but that should get you to a
> stable place. If you have any problems keep an eye on the logs for errors
> or warnings.
> The problem come from that i don't put  auto_boostrap to true for the new
> nodes, not in this documentation (
> http://www.datastax.com/docs/1.2/install/expand_ami)
>
> >if you are using secondary indexes use nodetool rebuild_index to rebuild
> those.
> can i do that at any time, or when the cluster are not loaded
>
> Thanks aaron,
>
> 2013/4/1 aaron morton <aaron@thelastpickle.com>
>
>> Please do not rely on colour in your emails, the best way to get your
>> emails accepted by the Apache mail servers is to use plain text.
>>
>> > At this moment the errors started, we see that members and other data
>> are gone, at this moment the nodetool status return (in red color the 3 new
>> nodes)
>> What errors?
>>
>> > I put for each of them seeds = A ip, and start each with two minutes
>> intervals.
>> When I'm making changes I tend to change a single node first, confirm
>> everything is OK and then do a bulk change.
>>
>> > Now the cluster seem to work normally, but i can use the secondary for
>> the moment, the queryanswer are random
>> run nodetool repair -pr on each node, let it finish before starting the
>> next one.
>> if you are using secondary indexes use nodetool rebuild_index to rebuild
>> those.
>> Add one node new node to the cluster and confirm everything is ok, then
>> add the remaining ones.
>>
>> >I'm not sure what or why it went wrong, but that should get you to a
>> stable place. If you have any problems keep an eye on the logs for errors
>> or warnings.
>>
>> Cheers
>>
>> -----------------
>> Aaron Morton
>> Freelance Cassandra Consultant
>> New Zealand
>>
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 31/03/2013, at 10:01 PM, Kais Ahmed <kais@neteck-fr.com> wrote:
>>
>> > Hi aaron,
>> >
>> > Thanks for reply, i will try to explain what append exactly
>> >
>> > I had 4 C* called [A,B,C,D] cluster (1.2.3-1 version) start with ec2
>> ami (https://aws.amazon.com/amis/datastax-auto-clustering-ami-2-2) with
>> > this config --clustername myDSCcluster --totalnodes 4--version community
>> >
>> > Two days after this cluster in production, i saw that the cluster was
>> overload, I wanted to extend it by adding 3 another nodes.
>> >
>> > I create a new cluster with 3 C* [D,E,F]  (
>> https://aws.amazon.com/amis/datastax-auto-clustering-ami-2-2)
>> >
>> > And follow the documentation (
>> http://www.datastax.com/docs/1.2/install/expand_ami) for adding them in
>> the ring.
>> > I put for each of them seeds = A ip, and start each with two minutes
>> intervals.
>> >
>> > At this moment the errors started, we see that members and other data
>> are gone, at this moment the nodetool status return (in red color the 3 new
>> nodes)
>> >
>> > Datacenter: eu-west
>> > ===================
>> > Status=Up/Down
>> > |/ State=Normal/Leaving/Joining/
>> >> Moving
>> >> --  Address           Load       Tokens  Owns   Host ID
>>                 Rack
>> >> UN  10.34.142.xxx     10.79 GB   256     15.4%
>>  4e2e26b8-aa38-428c-a8f5-e86c13eb4442  1b
>> >> UN  10.32.49.xxx       1.48 MB    256        13.7%
>>  e86f67b6-d7cb-4b47-b090-3824a5887145  1b
>> >> UN  10.33.206.xxx      2.19 MB    256    11.9%
>>  92af17c3-954a-4511-bc90-29a9657623e4  1b
>> >> UN  10.32.27.xxx       1.95 MB    256      14.9%
>>  862e6b39-b380-40b4-9d61-d83cb8dacf9e  1b
>> >> UN  10.34.139.xxx     11.67 GB   256    15.5%
>>  0324e394-b65f-46c8-acb4-1e1f87600a2c  1b
>> >> UN  10.34.147.xxx     11.18 GB   256     13.9%
>>  cfc09822-5446-4565-a5f0-d25c917e2ce8  1b
>> >> UN  10.33.193.xxx     10.83 GB   256      14.7%
>>  59f440db-cd2d-4041-aab4-fc8e9518c954  1b
>> >
>> > I saw that the 3 nodes have join the ring but they had no data, i put
>> the website in maintenance and lauch a nodetool repair on
>> > the 3 new nodes, during 5 hours i see in opcenter the data streamed to
>> the new nodes (very nice :))
>> >
>> > During this time, i write a script to check if all members are present
>> (relative to a copy of members in mysql).
>> >
>> > After data streamed seems to be finish, but i'm not sure because
>> nodetool compactionstats show pending task but nodetool netstats seems to
>> be ok.
>> >
>> > I ran my script to check if the data, but members are still missing.
>> >
>> > I decide to roolback by running nodetool decommission node D, E, F
>> >
>> > I re run my script, all seems to be ok but secondary index have strange
>> behavior,
>> > some time the row was returned some times no result.
>> >
>> > the user kais can be retrieve using his key with cassandra-cli but if i
>> use cqlsh :
>> >
>> > cqlsh:database> SELECT login FROM userdata where login='kais' ;
>> >
>> >  login
>> > ----------------
>> >  kais
>> >
>> > cqlsh:database> SELECT login FROM userdata where login='kais' ; //empty
>> > cqlsh:database> SELECT login FROM userdata where login='kais' ;
>> >
>> >  login
>> > ----------------
>> >  kais
>> >
>> > cqlsh:database> SELECT login FROM userdata where login='kais' ;
>> >
>> >  login
>> > ----------------
>> >  kais
>> >
>> > cqlsh:database> SELECT login FROM userdata where login='kais' ; //empty
>> > cqlsh:database> SELECT login FROM userdata where login='kais' ;
>> >
>> >  login
>> > ----------------
>> >  kais
>> >
>> > cqlsh:mydatabase>Tracing on;
>> > When tracing is activate i have this error but not all time
>> > cqlsh:mydatabase> SELECT * FROM userdata where login='kais' ;
>> > unsupported operand type(s) for /: 'NoneType' and 'float'
>> >
>> >
>> > NOTE : When the cluster contained 7 nodes, i see that my table userdata
>> (RF 3) on node D was replicated on E and F, that would seem strange because
>> its 3 node was not correctly filled
>> >
>> > Now the cluster seem to work normally, but i can use the secondary for
>> the moment, the query answer are random
>> >
>> > Thanks a lot for any help,
>> > Kais
>> >
>> >
>> >
>> >
>> >
>> > 2013/3/31 aaron morton <aaron@thelastpickle.com>
>> > First thought is the new nodes were marked as seeds.
>> > Next thought is check the logs for errors.
>> >
>> > You can always run a nodetool repair if you are concerned data is not
>> where you think it should be.
>> >
>> > Cheers
>> >
>> >
>> > -----------------
>> > Aaron Morton
>> > Freelance Cassandra Consultant
>> > New Zealand
>> >
>> > @aaronmorton
>> > http://www.thelastpickle.com
>> >
>> > On 29/03/2013, at 8:01 PM, Kais Ahmed <kais@neteck-fr.com> wrote:
>> >
>> >> Hi all,
>> >>
>> >> I follow this tutorial for expanding a 4 c* cluster (production) and
>> add 3 new nodes.
>> >>
>> >> Datacenter: eu-west
>> >> ===================
>> >> Status=Up/Down
>> >> |/ State=Normal/Leaving/Joining/Moving
>> >> --  Address           Load       Tokens  Owns   Host ID
>>                 Rack
>> >> UN  10.34.142.xxx     10.79 GB   256     15.4%
>>  4e2e26b8-aa38-428c-a8f5-e86c13eb4442  1b
>> >> UN  10.32.49.xxx       1.48 MB    256        13.7%
>>  e86f67b6-d7cb-4b47-b090-3824a5887145  1b
>> >> UN  10.33.206.xxx      2.19 MB    256    11.9%
>>  92af17c3-954a-4511-bc90-29a9657623e4  1b
>> >> UN  10.32.27.xxx       1.95 MB    256      14.9%
>>  862e6b39-b380-40b4-9d61-d83cb8dacf9e  1b
>> >> UN  10.34.139.xxx     11.67 GB   256    15.5%
>>  0324e394-b65f-46c8-acb4-1e1f87600a2c  1b
>> >> UN  10.34.147.xxx     11.18 GB   256     13.9%
>>  cfc09822-5446-4565-a5f0-d25c917e2ce8  1b
>> >> UN  10.33.193.xxx     10.83 GB   256      14.7%
>>  59f440db-cd2d-4041-aab4-fc8e9518c954  1b
>> >>
>> >> The data are not streamed.
>> >>
>> >> Can any one help me, our web site is down.
>> >>
>> >> Thanks a lot,
>> >>
>> >>
>> >
>> >
>>
>>
>
>

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