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Posted to user@cassandra.apache.org by Per Olesen <po...@trifork.com> on 2010/07/09 10:53:28 UTC
UnavailableException on QUORUM write
Hi,
I am a bit confused about getting an UnavailableException when doing a QUORUM write.
I have a 3 node cluster, with RF=3. When all 3 nodes are up, the QUORUM write succeeds. When 1 of the 3 nodes are down, the QUORUM write fails with UnavailableException. Shouldn't it be enough with 2 nodes up for RF=3? Won't N/2+1 be 2 in my case?
/Per
Re: UnavailableException on QUORUM write
Posted by Per Olesen <po...@trifork.com>.
On Jul 27, 2010, at 12:23 AM, Jonathan Ellis wrote:
> Can you turn on debug logging and try this patch?
Yes, but..I am on vacation now, so it will be about 3 weeks from now.
Re: UnavailableException on QUORUM write
Posted by Jonathan Ellis <jb...@gmail.com>.
Can you turn on debug logging and try this patch?
On Wed, Jul 21, 2010 at 1:23 AM, Per Olesen <po...@trifork.com> wrote:
>>> And when one of my non-seed nodes in my 3 node cluster is down, I do NOT get the exception.
>>> Anyway, guess I need to try and reproduce it in small scale.
>>
>>Does it return w/ UE immediately, or does it wait for RPCTimeout first?
>
> It returns with UE immediately.
>
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com
SV: UnavailableException on QUORUM write
Posted by Per Olesen <po...@trifork.com>.
>> And when one of my non-seed nodes in my 3 node cluster is down, I do NOT get the exception.
>> Anyway, guess I need to try and reproduce it in small scale.
>
>Does it return w/ UE immediately, or does it wait for RPCTimeout first?
It returns with UE immediately.
Re: UnavailableException on QUORUM write
Posted by Jonathan Ellis <jb...@gmail.com>.
On Tue, Jul 20, 2010 at 6:40 AM, Per Olesen <po...@trifork.com> wrote:
>>Seed should only be important when joining the cluster. You're using
>>the Thrift API, right?
>
> Yep!
>
> And when one of my non-seed nodes in my 3 node cluster is down, I do NOT get the exception.
> Anyway, guess I need to try and reproduce it in small scale.
Does it return w/ UE immediately, or does it wait for RPCTimeout first?
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com
SV: UnavailableException on QUORUM write
Posted by Per Olesen <po...@trifork.com>.
>Seed should only be important when joining the cluster. You're using
>the Thrift API, right?
Yep!
And when one of my non-seed nodes in my 3 node cluster is down, I do NOT get the exception.
Anyway, guess I need to try and reproduce it in small scale.
On Tue, Jul 20, 2010 at 5:34 AM, Per Olesen <po...@trifork.com> wrote:
> Hi,
>
> Think I might have found out the problem.
> I had only one seed node, and when that node is down, they all give UnavailableException. Guess at least one seed needs to be up then? Sounds fair.
>
>
> /Per
> ________________________________________
> Fra: Per Olesen [pol@trifork.com]
> Sendt: 9. juli 2010 11:19
> Til: user@cassandra.apache.org
> Emne: Re: UnavailableException on QUORUM write
>
> On Jul 9, 2010, at 11:11 AM, ChingShen wrote:
>
>> Which client library do you use?
>
> Direct on thrift api using thrift.jar, in version 917130.
>
>
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com
Re: UnavailableException on QUORUM write
Posted by Jonathan Ellis <jb...@gmail.com>.
Seed should only be important when joining the cluster. You're using
the Thrift API, right?
On Tue, Jul 20, 2010 at 5:34 AM, Per Olesen <po...@trifork.com> wrote:
> Hi,
>
> Think I might have found out the problem.
> I had only one seed node, and when that node is down, they all give UnavailableException. Guess at least one seed needs to be up then? Sounds fair.
>
>
> /Per
> ________________________________________
> Fra: Per Olesen [pol@trifork.com]
> Sendt: 9. juli 2010 11:19
> Til: user@cassandra.apache.org
> Emne: Re: UnavailableException on QUORUM write
>
> On Jul 9, 2010, at 11:11 AM, ChingShen wrote:
>
>> Which client library do you use?
>
> Direct on thrift api using thrift.jar, in version 917130.
>
>
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com
SV: UnavailableException on QUORUM write
Posted by Per Olesen <po...@trifork.com>.
Hi,
Think I might have found out the problem.
I had only one seed node, and when that node is down, they all give UnavailableException. Guess at least one seed needs to be up then? Sounds fair.
/Per
________________________________________
Fra: Per Olesen [pol@trifork.com]
Sendt: 9. juli 2010 11:19
Til: user@cassandra.apache.org
Emne: Re: UnavailableException on QUORUM write
On Jul 9, 2010, at 11:11 AM, ChingShen wrote:
> Which client library do you use?
Direct on thrift api using thrift.jar, in version 917130.
Re: UnavailableException on QUORUM write
Posted by Per Olesen <po...@trifork.com>.
On Jul 9, 2010, at 11:11 AM, ChingShen wrote:
> Which client library do you use?
Direct on thrift api using thrift.jar, in version 917130.
Re: UnavailableException on QUORUM write
Posted by ChingShen <ch...@gmail.com>.
Which client library do you use?
Shen
On Fri, Jul 9, 2010 at 4:53 PM, Per Olesen <po...@trifork.com> wrote:
> Hi,
>
> I am a bit confused about getting an UnavailableException when doing a
> QUORUM write.
>
> I have a 3 node cluster, with RF=3. When all 3 nodes are up, the QUORUM
> write succeeds. When 1 of the 3 nodes are down, the QUORUM write fails with
> UnavailableException. Shouldn't it be enough with 2 nodes up for RF=3? Won't
> N/2+1 be 2 in my case?
>
> /Per
Re: UnavailableException on QUORUM write
Posted by Jonathan Ellis <jb...@gmail.com>.
this sounds like a bug, although if you've attempted any node movement
or bootstrapping, that could cause the required quorum to be larger
than just the number of nodes.
On Fri, Jul 9, 2010 at 3:53 AM, Per Olesen <po...@trifork.com> wrote:
> Hi,
>
> I am a bit confused about getting an UnavailableException when doing a QUORUM write.
>
> I have a 3 node cluster, with RF=3. When all 3 nodes are up, the QUORUM write succeeds. When 1 of the 3 nodes are down, the QUORUM write fails with UnavailableException. Shouldn't it be enough with 2 nodes up for RF=3? Won't N/2+1 be 2 in my case?
>
> /Per
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com