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Posted to user@cassandra.apache.org by dayu <sd...@163.com> on 2018/12/15 17:57:32 UTC
Does long latency affect Cassandra's performance
Hi all，
I am adding a new node to cassandra，but the new node is at different DC，the ping latency between them is 2 ms.
I am wondering does the long latency would affect cluster's performance or thoughput？
Thank!
dayu
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dayu
邮箱：sdycreate@163.com
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Signature is customized by Netease Mail Master
Re: Does long latency affect Cassandra's performance
Posted by Nitan Kainth <ni...@gmail.com>.
Yes, it will have negative impact.
Avoid doing it if you can
Sent from my iPhone
> On Dec 15, 2018, at 12:18 PM, dayu <sd...@163.com> wrote:
>
> Nitan,
> thanks for your reply.
> The new node in different DC is added as same DC, so i mean I use quorum or all for three replicate not local quorum.
> does the long latency will block coordinate and affect the performance？
>
> dayu
>
>
> dayu
> 邮箱：sdycreate@163.com
> Signature is customized by Netease Mail Master
>
> On 12/16/2018 02:00, Nitan Kainth wrote:
> Dayu,
>
> If you use local quorum it won't impact read and write latencies but there will be delay in across DC replication; which may cause some application issues if it is active active. But 2ms is probably negligible to see any effect.
>
>> On Sat, Dec 15, 2018 at 11:57 AM dayu <sd...@163.com> wrote:
>> Hi all，
>> I am adding a new node to cassandra，but the new node is at different DC，the ping latency between them is 2 ms.
>> I am wondering does the long latency would affect cluster's performance or thoughput？
>>
>> Thank!
>> dayu
>>
>>
>> dayu
>> 邮箱：sdycreate@163.com
>> Signature is customized by Netease Mail Master
Re: Does long latency affect Cassandra's performance
Posted by dayu <sd...@163.com>.
Nitan,
thanks for your reply.
The new node in different DC is added as same DC, so i mean I use quorum or all for three replicate not local quorum.
does the long latency will block coordinate and affect the performance？
dayu
| |
dayu
邮箱：sdycreate@163.com
|
Signature is customized by Netease Mail Master
On 12/16/2018 02:00, Nitan Kainth wrote:
Dayu,
If you use local quorum it won't impact read and write latencies but there will be delay in across DC replication; which may cause some application issues if it is active active. But 2ms is probably negligible to see any effect.
On Sat, Dec 15, 2018 at 11:57 AM dayu <sd...@163.com> wrote:
Hi all，
I am adding a new node to cassandra，but the new node is at different DC，the ping latency between them is 2 ms.
I am wondering does the long latency would affect cluster's performance or thoughput？
Thank!
dayu
| |
dayu
邮箱：sdycreate@163.com
|
Signature is customized by Netease Mail Master
Re: Does long latency affect Cassandra's performance
Posted by Nitan Kainth <ni...@gmail.com>.
Dayu,
If you use local quorum it won't impact read and write latencies but there
will be delay in across DC replication; which may cause some application
issues if it is active active. But 2ms is probably negligible to see any
effect.
On Sat, Dec 15, 2018 at 11:57 AM dayu <sd...@163.com> wrote:
> Hi all，
> I am adding a new node to cassandra，but the new node is at different
> DC，the ping latency between them is 2 ms.
> I am wondering does the long latency would affect cluster's performance
> or thoughput？
>
> Thank!
> dayu
>
> dayu
> 邮箱：sdycreate@163.com
>
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