HI Ben,
Thanks a lot for your response. One follow up question, say if I have a
daemon running and it got restarted and it is expecting full update from OVSDB
via IDL, even in that case the playback to IDL is done in same order of
insertion to DB? If not, please advise steps to be taken by the daemon here.
Thanks
Krishan Mohan.
-----Original Message-----
From: Ben Pfaff [mailto:[email protected]]
Sent: Monday, August 01, 2016 9:27 PM
To: Elluru, Krishna Mohan <[email protected]>
Cc: [email protected]
Subject: Re: [ovs-dev] Question about Hierarchical playback to IDL
On Mon, Aug 01, 2016 at 08:08:02AM +0000, Elluru, Krishna Mohan wrote:
> I have an question regarding the playback to IDL. Whenever there is change in
> DB, IDL will be notified about the same. I am interested to know about the
> order of which it is played back to IDL via json messages.
>
> Example: Item collection. There are two tables, one called item table, one
> called book. Book table has a reference to item table(1:m). now, I am making
> multiple(say 1000, each txn includes item row + book row insert) txn executes
> using a script to insert records in to DB and my daemon idl is expected them
> to print in order of book and items it contains.
>
> Is it always guaranteed that item table rows will be updated in idl prior to
> book table rows(Hierarchal)? If yes, will it be all items rows first,
> followed by book table rows or few item rows first, and relevant book table
> rows? If it is not in hierarchal order, how to get them in that order.
The database applies transactions in the order in which it receives them, it
reports the transactions to clients in the same order, and the IDL applies
transactions one by one as it receives them, each one atomically. The database
server never breaks transactions apart when it sends them to clients, but when
there is a lot of traffic it sometimes combines multiple transactions into one.
Thus, a client will never see only part of a transaction--they are atomic.
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