incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jianing Hu <jian...@gmail.com>
Subject Re: cassandra 0.6.1 read returns wrong data?
Date Mon, 02 Aug 2010 20:20:15 GMT
The error I'm seeing seems to be random: if I try to get the data
again I usually get the correct data. Although maybe compaction
happened between when the error occurred and when I checked again and
the bad key was fixed? I'll try upgrading to 0.6.4 anyway and see if
it helps. Thanks for the help.

On Mon, Aug 2, 2010 at 12:29 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
> Yes, it is deterministic (but compaction could change which precise
> keys are affected)
>
> On Mon, Aug 2, 2010 at 1:15 PM, Jianing Hu <jianing@gmail.com> wrote:
>> Does that bug cause *random* data read errors? Looks like it may fail
>> in a deterministic way, but I'm not familiar with the code base so
>> please correct me if I'm wrong.
>>
>> On Fri, Jul 30, 2010 at 8:49 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
>>> This is probably a bug fixed in 0.6.2:
>>>
>>>  * fix size of row in spanned index entries (CASSANDRA-1056)
>>>
>>> You should upgrade to 0.6.4 (due out this weekend).
>>>
>>> On Wed, Jul 28, 2010 at 7:47 PM, Jianing Hu <jianing@gmail.com> wrote:
>>>> We recently migrated part of our MySQL database to a 3-node Cassandra
>>>> cluster with a replication factor of 3. Couple of days ago we noticed
>>>> that Cassandra sometimes returns the wrong data. Not corrupted data,
>>>> but data for a different key than the one being asked for. This error
>>>> appears to be random and intermittent, and happens for maybe every 10K
>>>> reads. I'm working on a test suite that can reproduce this. Meanwhile
>>>> just wanted to ask if anyone has seen this problem before? I've tried
>>>> consistency levels of both QUORUM and ONE, and see the issue with
>>>> both.
>>>>
>>>> Thanks,
>>>> - Jianing
>>>>
>>>
>>>
>>>
>>> --
>>> Jonathan Ellis
>>> Project Chair, Apache Cassandra
>>> co-founder of Riptano, the source for professional Cassandra support
>>> http://riptano.com
>>>
>>
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>

Mime
View raw message