Hazelcast IMAP Entry Listener notification Ordering

[amit gupta]

Hi All,

I have few questions regarding the order of notifications delivered to an entry listener as a when Add/Modify/Delete operations performed on an IMAP.

• Does Hazelcast guarantee that notification to a listener will deliver in the same order as an operation performed on IMAP pertaining to the same key?
• Does Ancy/Sync client play a role here to guarantee the ordered delivery as mentioned in the point above?

Regards,

Amit

[amit gupta]

Let me rephrase this again...

• I want to know if the Entry listener client receives the notification in the same order as operations are performed on an IMAP e.g. if operations are performed in the order of Add/Update/Delete then Listener will also get the notification in the same order. Is this guaranteed based on the key?
• Is this dependent on factors like whether we use Sync/Async client?

Any help regarding this is well appreciated.

Regards,

Amit

[amit gupta]

Let me rephrase this again...

• I want to know if the Entry listener client receives the notification in the same order as operations are performed on an IMAP e.g. if operations are performed in the order of Add/Update/Delete then Listener will also get the notification in the same order. Is this guaranteed based on the key?
• Is this dependent on factors like whether we use Sync/Async client?

Any help regarding this is well appreciated

[Neil Stevenson]

Hi

 If there are two updates to key X, it is guaranteed that the client gets them in the order they occurred for that key.

 If there is an update to key X and to key Y, it is not guaranteed which one the clients gets first, as for instance, these updates could have happened on different servers

 Use of aysnc/sync won't affect this.

 See also https://docs.hazelcast.org/docs/4.0.3/manual/html-single/index.html#global-event-configuration

Neil

[amit gupta]

Thank you so much Neil!

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