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From Ruchir Jha <ruchir....@gmail.com>
Subject Re: Node bootstrap
Date Tue, 05 Aug 2014 14:21:26 GMT
Also not sure if this is relevant but just noticed the nodetool tpstats
output:

Pool Name                    Active   Pending      Completed   Blocked  All
time blocked
FlushWriter                       0         0           1136         0
          512

Looks like about 50% of flushes are blocked.


On Tue, Aug 5, 2014 at 10:14 AM, Ruchir Jha <ruchir.jha@gmail.com> wrote:

> Yes num_tokens is set to 256. initial_token is blank on all nodes
> including the new one.
>
>
> On Tue, Aug 5, 2014 at 10:03 AM, Mark Reddy <mark.reddy@boxever.com>
> wrote:
>
>> My understanding was that if initial_token is left empty on the new node,
>>> it just contacts the heaviest node and bisects its token range.
>>
>>
>> If you are using vnodes and you have num_tokens set to 256 the new node
>> will take token ranges dynamically. What is the configuration of your other
>> nodes, are you setting num_tokens or initial_token on those?
>>
>>
>> Mark
>>
>>
>> On Tue, Aug 5, 2014 at 2:57 PM, Ruchir Jha <ruchir.jha@gmail.com> wrote:
>>
>>> Thanks Patricia for your response!
>>>
>>> On the new node, I just see a lot of the following:
>>>
>>> INFO [FlushWriter:75] 2014-08-05 09:53:04,394 Memtable.java (line 400)
>>> Writing Memtable
>>> INFO [CompactionExecutor:3] 2014-08-05 09:53:11,132 CompactionTask.java
>>> (line 262) Compacted 12 sstables to
>>>
>>> so basically it is just busy flushing, and compacting. Would you have
>>> any ideas on why the 2x disk space blow up. My understanding was that if
>>> initial_token is left empty on the new node, it just contacts the heaviest
>>> node and bisects its token range. And the heaviest node is around 2.1 TB,
>>> and the new node is already at 4 TB. Could this be because compaction is
>>> falling behind?
>>>
>>> Ruchir
>>>
>>>
>>> On Mon, Aug 4, 2014 at 7:23 PM, Patricia Gorla <
>>> patricia@thelastpickle.com> wrote:
>>>
>>>> Ruchir,
>>>>
>>>> What exactly are you seeing in the logs? Are you running major
>>>> compactions on the new bootstrapping node?
>>>>
>>>> With respect to the seed list, it is generally advisable to use 3 seed
>>>> nodes per AZ / DC.
>>>>
>>>> Cheers,
>>>>
>>>>
>>>> On Mon, Aug 4, 2014 at 11:41 AM, Ruchir Jha <ruchir.jha@gmail.com>
>>>> wrote:
>>>>
>>>>> I am trying to bootstrap the thirteenth node in a 12 node cluster
>>>>> where the average data size per node is about 2.1 TB. The bootstrap
>>>>> streaming has been going on for 2 days now, and the disk size on the
new
>>>>> node is already above 4 TB and still going. Is this because the new node
is
>>>>> running major compactions while the streaming is going on?
>>>>>
>>>>> One thing that I noticed that seemed off was the seeds property in the
>>>>> yaml of the 13th node comprises of 1..12. Where as the seeds property
on
>>>>> the existing 12 nodes consists of all the other nodes except the thirteenth
>>>>> node. Is this an issue?
>>>>>
>>>>> Any other insight is appreciated?
>>>>>
>>>>> Ruchir.
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Patricia Gorla
>>>> @patriciagorla
>>>>
>>>> Consultant
>>>> Apache Cassandra Consulting
>>>> http://www.thelastpickle.com <http://thelastpickle.com>
>>>>
>>>
>>>
>>
>

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