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From Carlos Rolo <r...@pythian.com>
Subject Re: too many compactions pending and compaction is slow on few tables
Date Fri, 07 Apr 2017 19:27:15 GMT
Is not a good idea to do LCS on spinning. Change to STCS, and reduce the
compactors to 2 (if you have more than 2). Check if that helps.

On Apr 7, 2017 20:18, "Matija Gobec" <matija0204@gmail.com> wrote:

> It does as the "new" data, even if the values are the same, has new write
> time timestamp.
> Spinning disks are hard to run LCS on. Do you maybe have some kind of non
> stripe raid in place?
>
> On Fri, Apr 7, 2017 at 8:46 PM, Giri P <gpatcham@gmail.com> wrote:
>
>> Does LCS try compacting already compacted files if it see same key loaded
>> again ?
>>
>> On Fri, Apr 7, 2017 at 11:39 AM, Giri P <gpatcham@gmail.com> wrote:
>>
>>> cassandra version : 2.1
>>> volume : initially loading 28 days worth of data around 1 TB and then we
>>>  process hourly
>>> load: only cassandra running on nodes
>>> disks: spinning disks
>>>
>>>
>>>
>>> On Fri, Apr 7, 2017 at 11:27 AM, Jonathan Haddad <jon@jonhaddad.com>
>>> wrote:
>>>
>>>> What version of Cassandra? How much data? How often are you reloading
>>>> it? Is compaction throttled? What disks are you using? Any other load on
>>>> the machine?
>>>> On Fri, Apr 7, 2017 at 11:19 AM Giri P <gpatcham@gmail.com> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> we are continuously loading a table which has properties properties
>>>>> compaction strategy LCS and bloom filter off and compactions are not
>>>>> catching up . Even the compaction is running slow on that table even
after
>>>>> we increases throughput and concurrent compactors.
>>>>>
>>>>> Can someone point me to what I should be looking to tune this ?
>>>>>
>>>>> Thanks
>>>>> Giri
>>>>>
>>>>
>>>
>>
>

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