Maxim, I fixed issue, which you found above. Look
at
org.apache.ignite.internal.processors.cache.ClusterReadOnlyModeTest#testDataStreamerReadOnlyConcurrent*
tests.
вт, 4 июн. 2019 г. в 15:58, Maxim Muzafarov :
> >> We throw CacheException on each update to read-only cluster. User code
> must
I agree with Ivan's concern - do we really need the "activation" concept in
Ignite?
Activation was introduced with Ignite persistence: we must prevent both the
read and write operations on a cluster with persistence on until full data
set is loaded (all the nodes are started). Cluster
Alex and all,
> From a user's point of view:
> Inactive cluster - deny writes, deny reads.
> Read-only cluster - deny writes, allow reads.
I would be great to explain what is the need to deny both reads and
writes. What tasks are not possible to solve when cluster is in
read-only state?
ср, 5
Ivan,
>From a user's point of view:
Inactive cluster - deny writes, deny reads.
Read-only cluster - deny writes, allow reads.
ср, 5 июн. 2019 г. в 10:44, Павлухин Иван :
> Sergey,
>
> > On inactive cluster caches aren't started. So you can't get data from
> cache.
>
> As a user I do not
Sergey,
> On inactive cluster caches aren't started. So you can't get data from
cache.
As a user I do not understand what does it mean for cache to be
started. IgniteCache does not provide start/stop methods.
I am trying to figure out why there should be 2 modes (not from an
implementation
Maxim, thank you for reproducer. It looks like a bug. I will fix it!
вт, 4 июн. 2019 г. в 15:58, Maxim Muzafarov :
> >> We throw CacheException on each update to read-only cluster. User code
> must handle CacheException correctly .You could find test on it in
>
>> We throw CacheException on each update to read-only cluster. User code must
>> handle CacheException correctly .You could find test on it in
>> ClusterReadOnlyModeTest#testDataStreamerReadOnly()
In this test, DataStreamer starts when the cluster already changes its
mode, but not before.
Hello, Maxim!
>> Do we have an IEP for this feature?
No, we don't have.
>> How we guarantee that all cache operations delivered (or not yet) to
backups are not rejected by applied read-only request?
I reused cluster activation mechanism. So enabling read-only mode generates
an exchange on
Hello, Ivan.
>>What is a fundamental difference between them?
On inactive cluster caches aren't started. So you can't get data from
cache.
вт, 4 июн. 2019 г. в 12:16, Павлухин Иван :
> Sergey, Igniters,
>
> Sorry if my question is not very smart.
>
> I am trying to think about it from a
I don't remember if we agreed on it before. But it may be so, just a
problem for me to remember it. Any big feature - it is quite a vague
definition.
My concern we'll end up with +1 inactive/uncompleted/not actual IEP. For
now, we have a number of open IEPs, and no-one resolves it. I guess it
Hello, Dmitriy.
I don't agree with you.
IEP should be written for any big changes in product.
We should have it for:
1. Following contributors.
2. History of decision making.
3. Easier documenting.
Without IEPs our product will become a total mess.
In the Apache Kafka one can't change any
Folks,
Sorry for offtopic. IEP is a good tool for case design is discussed before
any implementation available. It is a good place to share the intent to do
something and provide some details. It is a better place then mile-long
emails.
For now, we have code and documentation later should be
Sergey, Igniters,
Sorry if my question is not very smart.
I am trying to think about it from a perspective of a (newbie) user.
And from the first glance it is not clear how a read-only cluster is
different from a not active cluster? What is a fundamental difference
between them? Can we combine
Sergey,
Do we have an IEP for this feature?
What should happen when on an active cluster with put operations if we
receive a read-only state change request? How we guarantee that all
cache operations delivered (or not yet) to backups are not rejected by
applied read-only request? I haven't found
Hello, Zhenya, Maxim!
Thank you for your replies!
>> Should we also allow writes to the DistributedMetaStorage and if not why?
Yes. DistributedMetastorage available for updates with enabled read-only
mode. I added test about it to ClusterReadOnlyModeSelfTest
>> What's the purpose for
hi, Sergey.
What's the purpose for ignite-sys-cache updates still be available ?
thanks !
Hello Igniters!
I'm working on cluster read-only mode [1] feature. In this mode cluster
will be available only for read operations, all data modification
operations in user caches will be rejected
with
Sergey,
I think it will be a very useful feature for Ignite's users, my +1 here.
Can you clarify what kind of updates are written to the ignite-sys-cache?
Should we also allow writes to the DistributedMetaStorage and if not why?
On Thu, 30 May 2019 at 19:55, Dmitriy Pavlov wrote:
>
> ++1 from
++1 from my side. This mode seems to be very useful for Ignite users.
чт, 30 мая 2019 г. в 19:47, Sergey Antonov :
> Hello Igniters!
>
> I'm working on cluster read-only mode [1] feature. In this mode cluster
> will be available only for read operations, all data modification
> operations in
Hello Igniters!
I'm working on cluster read-only mode [1] feature. In this mode cluster
will be available only for read operations, all data modification
operations in user caches will be rejected
with ClusterReadOnlyModeCheckedException. This feature could be helpfull
for maintenance works
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