Re: [support] ignite tuning help
thank you share so good article
Replied Message
From Jeremy McMillan Date 06/21/2024 20:57 To
user@ignite.apache.org Cc Subject Re: [support] ignite tuning help
Also, I didn't look at your network trace screen cap, but you should have zero
TCP retransmissions if you set your initial TCP window send window small enough.
https://www.auvik.com/franklyit/blog/tcp-window-size/
On Fri, Jun 21, 2024, 07:53 Jeremy McMillan wrote:
It could be network or persistent storage. What's the proportion of fast to
slow gets?
On Thu, Jun 20, 2024, 22:48 f cad wrote:
here is a screenshot example
f cad 于2024年6月21日周五 11:45写道：
Hello, community:
I have a cluster ,with three nodes.
I have two cache, that AtomicityMode is TRANSACTIONAL and Backups number is two
and WriteSynchronizationMode is PRIMARY_SYNC
I use IgniteClientSpringTransactionManagerwith OPTIMISTIC transaction and
SERIALIZABLE concurrency mode.
pseudocode like below
ignite.transactions().txStart
if(acahce.get(key)==null) {
aCahce.put(key,value)
bCahce.put(key,value)
}
tx.commit()
Sometimes I find aCahce.get(key) costs 80ms ,Sometimes that costs only 5ms.
and three ignite nodes usage of cpu and io and memory all not high.
and client node usage of cpu and io and memory all not high. but I use tcpdump
to find that Between nodes, there are over 40 TCP retransmissions per second.
So is this a network issue?
Re: [support] ignite tuning help
Also, I didn't look at your network trace screen cap, but you should have
zero TCP retransmissions if you set your initial TCP window send window
small enough.
https://www.auvik.com/franklyit/blog/tcp-window-size/
On Fri, Jun 21, 2024, 07:53 Jeremy McMillan wrote:
> It could be network or persistent storage. What's the proportion of fast
> to slow gets?
>
>
> On Thu, Jun 20, 2024, 22:48 f cad wrote:
>
>> here is a screenshot example
>> [image: image.png]
>>
>> f cad 于2024年6月21日周五 11:45写道：
>>
>>> Hello, community:
>>>
>>> I have a cluster ,with three nodes.
>>> I have two cache, that AtomicityMode is TRANSACTIONAL and Backups number is
>>> two and WriteSynchronizationMode is PRIMARY_SYNC
>>>
>>>
>>> I use IgniteClientSpringTransactionManagerwith OPTIMISTIC transaction and
>>> SERIALIZABLE concurrency mode.
>>>
>>> pseudocode like below
>>> ignite.transactions().txStart
>>> if(acahce.get(key)==null) {
>>> aCahce.put(key,value)
>>> bCahce.put(key,value)
>>> }
>>> tx.commit()
>>>
>>> Sometimes I find aCahce.get(key) costs 80ms ,Sometimes that costs only 5ms.
>>> and three ignite nodes usage of cpu and io and memory all not high.
>>> and client node usage of cpu and io and memory all not high.
>>> but I use tcpdump to find that Between nodes, there are over 40 TCP
>>> retransmissions per second.
>>> So is this a network issue?
>>>
>>>
Re: [support] ignite tuning help
It could be network or persistent storage. What's the proportion of fast to
slow gets?
On Thu, Jun 20, 2024, 22:48 f cad wrote:
> here is a screenshot example
> [image: image.png]
>
> f cad 于2024年6月21日周五 11:45写道：
>
>> Hello, community:
>>
>> I have a cluster ,with three nodes.
>> I have two cache, that AtomicityMode is TRANSACTIONAL and Backups number is
>> two and WriteSynchronizationMode is PRIMARY_SYNC
>>
>>
>> I use IgniteClientSpringTransactionManagerwith OPTIMISTIC transaction and
>> SERIALIZABLE concurrency mode.
>>
>> pseudocode like below
>> ignite.transactions().txStart
>> if(acahce.get(key)==null) {
>> aCahce.put(key,value)
>> bCahce.put(key,value)
>> }
>> tx.commit()
>>
>> Sometimes I find aCahce.get(key) costs 80ms ,Sometimes that costs only 5ms.
>> and three ignite nodes usage of cpu and io and memory all not high.
>> and client node usage of cpu and io and memory all not high.
>> but I use tcpdump to find that Between nodes, there are over 40 TCP
>> retransmissions per second.
>> So is this a network issue?
>>
>>
