simonbowen
I have a system which I need to feed data into and maintain. Currently I have a GenServer that communicates with an ETS table and inserts items into the table. As part of this I have a FIFO erlang queue, when an item is added to the ETS table I am pushing it to the queue to be consumed from elsewhere.
For some reason the ordering of the items in the ETS and Queue are different and I cannot work out why. This is the code I am using to push the item into the ETS table and Queue.
with :ok <- Queue.add(job), true <- :ets.insert(table, {id, job}) do
PubSub.broadcast!(BrokerEx.PubSub, @topic, {:added, job})
end
When I dump the contents of the table and the queue they are not the same. The Queue in this context is a simple GenServer that manipulates Erlangs built in queue module.
Where am I going wrong?
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simonbowen
I’ve worked it out. Using
table = :ets.new("table", [:set, :protected])creates an ETS table with the type ofsetand there is no guarantee of the order with this table type.To be honest I think I need to use a RDBMS at this point anyway since I need to have some persistence for this data anyway.
dimitarvp
Yep, was about to say “why not use a database”? You can also use timeseries if needed – not so hard to install the
timescalePostgres extension. Or you can just queue things up in Redis and have background workers pull them away from there and store them in a regular DB.