Question about - "Unexpected snapshot event for MERGE item"

[patilgkk]

Thanks for reply..

Can i set the custom snapshot (set of data as snapshot) from DataAdapter ??

[Mone]

Hi,

you always send the initial snapshot events from the data adapter through the update/smartUpdate methods of the ItemEventListener you receive with each subscribe call on your DataProvider, setting the isSnapshot boolean to true.
Did you mean something different?

[patilgkk]

Hi Mone,
ya we can set the initial snapshot(static data form DB) for each subscribe call...
But as per my understanding if same item is subscribed by more than one client at a time, the subscribe method in DataAdapter will be called only once(for first client) by lightstreamer kernel, subsequent client request will be handled by lightstreamer kernel itself, call will not go to subscribe method of Data adpter.In this case subsequent clients will not receive snapshot data. so how to pass the initial snapshot(static data from db)to the subsequent clients.

and every client should be able to see same set of data initially..

[Mone]

as you said, from the second client subscribing to a certain item on, the initial snapshot will be handled by the kernel, so you don't have to prepare the initial snapshot for such clients.
The server will keep a snapshot that will be getDistinctSnapshotLength long and will give it to any new client subscribing to such item.
Each time a new real-time update is published for the item, the server will update the snapshot, removing (if necessary) the oldest update and adding the new one.

So, you don't need to send by yourself the initial snapshot to all the clients.