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From Sylvain Lebresne <sylv...@datastax.com>
Subject Re: What is the nodeId for?
Date Wed, 20 Jul 2011 15:42:16 GMT
Possibly, you've hitted this:
https://issues.apache.org/jira/browse/CASSANDRA-2824
Should be fixed in next minor release.

In the meantime, you "fix" should be alright.

--
Sylvain


On Wed, Jul 20, 2011 at 3:47 PM, Boris Yen <yulinyen@gmail.com> wrote:
> Hi Sam,
> Thanks for the explanation.
> The NodeIds do appear in the Local row of NodeIdInfo, and after manually
> deleting two (I got three before I deleted them) of them from CurrentLocal
> row, the cassandra can be restarted now. I was just thinking what could be
> the possible cause for this? and wondering if anyone has any idea about
> this?
> Boris
>
> On Wed, Jul 20, 2011 at 8:00 PM, Sam Overton <soverton@acunu.com> wrote:
>>
>> The NodeId is used in counter replication. Counters are stored on each
>> replica as a set of "shards," where each shard corresponds to the local
>> count of one of the replicas for that counter, as identified by the NodeId.
>> A NodeId is generated the first time cassandra starts, and might be
>> renewed during cleanup, or if you explicitly tell cassandra to generate a
>> new one by starting it with -Dcassandra.renew_counter_id
>> Do either of the NodeIds in the CurrentLocal row also appear in the Local
>> row of the NodeIdInfo CF? the Local row is a history of previous NodeIds
>> belonging to this node. If one appears in the history and the other does
>> not, it is probably safe to assume that the old NodeId was not deleted from
>> the CurrentLocal row correctly, and so you could try removing it from there
>> manually.
>>
>> Sam
>> --
>> Sam Overton
>> Acunu | http://www.acunu.com | @acunu
>> On 20 July 2011 12:25, Boris Yen <yulinyen@gmail.com> wrote:
>>>
>>> Hi,
>>> I think we might have screwed our data up. I saw multiple columns inside
>>> record: System.NodeIdInfo.CurrentLocal. It makes our cassandra dead forever.
>>> I was wondering if anyone could tell me what the NodeId is for? so that I
>>> might be able to duplicate this.
>>> Thanks in advance
>>> Boris
>
>

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