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From: Jonathan Ellis <jbellis@gmail.com>
Date: Thu, 20 May 2010 14:04:31 -0700
Message-ID: <AANLkTik8Po8J-Es1g8GLB8-FAsZWCIyiGKrdi36EpEBX@mail.gmail.com>
Subject: Re: Strange error with data reading
To: user@cassandra.apache.org
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yes, the extra io + cpu caused by decomission will affect reads (and
writes, to a lesser degree)

On Thu, May 20, 2010 at 10:18 AM, Maxim Kramarenko
<maximkr@trackstudio.com> wrote:
> It reports, that node 3 transfer data to node 1. As I remember, node 2
> doesn't send or receive data.
>
> BTW, after a few hrs (probably, after decomission finished), node 2 becom=
e
> work again, without restart. Can decommission of node 3 affect reading ?
>
> On 20.05.2010 18:51, Jonathan Ellis wrote:
>>
>> What does JMX report as described in
>> http://wiki.apache.org/cassandra/Streaming ?
>>
>> 2010/5/19 Maxim Kramarenko<maximkr@trackstudio.com>:
>>>
>>> Hello!
>>>
>>> I have 3 node cluster: node1, node2, node3. Replication factor =3D 2.
>>> I run decommission on node3 and it's in progress, moving data to node1
>>>
>>> Ring on all nodes show all 3 nodes up, no problems (but node 1 response
>>> with
>>> 3-5 sec delay).
>>>
>>> I tried to execute a few "get" statements using cli, like
>>> get =A0MailArchive.Meta['ec3-n2:1274046482!5C/9B-05558-11860FB4!c']
>>>
>>> on node 1 and 3 all works fine, but node 2 cli always return
>>> Exception null
>>>
>>> data is 3 days old, so it doesn't seems like temp effect.
>>>
>>> No errors in log.
>>> Node 2 restart doesn't help too.
>>> tpstats returns 0 active/pending in all rows.
>>>
>>> What is it ?
>>>
>>
>>
>>
>


--=20
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com