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From Pranay Agarwal <agarwalpran...@gmail.com>
Subject Re: Adding new node to Cassandra cluster is too slow
Date Fri, 20 Mar 2015 17:53:45 GMT
Thank Rahul, you are right. Unless the node complete joins the ring, there
is no data dependency on them.


On Fri, Mar 20, 2015 at 4:46 AM, Rahul Neelakantan <rahul@rahul.be> wrote:

> You won't lose data unless you have run nodetool cleanup on the existing
> nodes.
>
> Rahul
>
> On Mar 19, 2015, at 9:16 PM, Pranay Agarwal <agarwalpranaya@gmail.com>
> wrote:
>
> Also, the new nodes (3 of them, in *UJ state*) are showing some data size
> (~10g). Is there any data loss chances with stopping the cassandra on them?
>
> On Thu, Mar 19, 2015 at 6:02 PM, Pranay Agarwal <agarwalpranaya@gmail.com>
> wrote:
>
>> Thanks Rob, You are right. I am using ReleaseVersion: 2.1.0
>>
>> What do you mean by point 3? Also, by doing one at a time, does it mean
>> wait till nodetool status of the new node is UN from UJ?
>>
>> On Thu, Mar 19, 2015 at 5:44 PM, Robert Coli <rcoli@eventbrite.com>
>> wrote:
>>
>>> On Thu, Mar 19, 2015 at 5:32 PM, Pranay Agarwal <
>>> agarwalpranaya@gmail.com> wrote:
>>>
>>>> I have 14 nodes cassandra cluster, each node as around 50gb of data. I
>>>> added 3 new nodes to the cluster and I can see the status as *UJ *for
>>>> the new nodes. They have been in that for almost a day now and their data
>>>> size seems to be same as well. There is almost no CPU or disk usage either
>>>> on them.
>>>>
>>>
>>> It is not supported to add multiple nodes to a cluster simultaneously
>>> until 2.1.1 [1]. Usually what happens is one or more of the bootstraps
>>> fails and hangs forever. This seems to be what has happened to you.
>>>
>>> To resolve :
>>>
>>> 1) stop each of the bootstrapping nodes
>>> 2) wipe their data directories completey
>>> 3) verify that they do not show up in gossip on the other nodes
>>> 4) bootstrap them again, one at a time
>>>
>>> =Rob
>>> [1] https://issues.apache.org/jira/browse/CASSANDRA-7069
>>>
>>>
>>>
>>
>

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