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From Benjamin Roth <benjamin.r...@jaumo.com>
Subject Re: Cassandra Config as per server hardware for heavy write
Date Wed, 23 Nov 2016 07:26:19 GMT
This is ridiculously slow for that hardware setup. Sounds like you
benchmark with a single thread and / or sync queries or very large writes.
A setup like this should be easily able to handle tens of thousands of
writes / s

2016-11-23 8:02 GMT+01:00 Jonathan Haddad <jon@jonhaddad.com>:

> How are you benchmarking that?
> On Tue, Nov 22, 2016 at 9:16 PM Abhishek Kumar Maheshwari <
> Abhishek.Maheshwari@timesinternet.in> wrote:
>
>> Hi,
>>
>>
>>
>> I have 8 servers in my Cassandra Cluster. Each server has 64 GB ram and
>> 40 Cores and 8 SSD. Currently I have below config in Cassandra.yaml:
>>
>>
>>
>> concurrent_reads: 32
>>
>> concurrent_writes: 64
>>
>> concurrent_counter_writes: 32
>>
>> compaction_throughput_mb_per_sec: 32
>>
>> concurrent_compactors: 8
>>
>>
>>
>> With this configuration, I can write 1700 Request/Sec per server.
>>
>>
>>
>> But our desired write performance is 3000-4000 Request/Sec per server. As
>> per my Understanding Max value for these parameters can be as below:
>>
>> concurrent_reads: 32
>>
>> concurrent_writes: 128(8*16 Corew)
>>
>> concurrent_counter_writes: 32
>>
>> compaction_throughput_mb_per_sec: 128
>>
>> concurrent_compactors: 8 or 16 (as I have 8 SSD and 16 core reserve for
>> this)
>>
>>
>>
>> Please let me know this is fine or I need to tune some other parameters
>> for speedup write.
>>
>>
>>
>>
>>
>> *Thanks & Regards,*
>> *Abhishek Kumar Maheshwari*
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>>
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>


-- 
Benjamin Roth
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