sync | : tv : Interactive , synchronized YouTube streaming

i think you are looking for this:

According to the Go memory model:

https://golang.org/ref/mem

There are no guarantees that one goroutine will see the operations performed by another goroutine unless there is an explicit synchronization between the two using channels, mutex. etc.

In your example: the fact that a goroutines sees done=true does not imply it will see a set. This is only guaranteed if there is explicit synchronization between the goroutines.

The sync.Once probably offers such synchronization, so that's why you have not observed this behavior. There is still a memory race, and on a different platform with a different implementation of sync.Once, things may change.

AsyncPostBackTrigger only sets controls that are outside of the panel.

Controls on the page outside of an update panel can refresh an UpdatePanel control by defining them as triggers. Triggers are defined by using the AsyncPostBackTrigger element.

Controls that postback will always postback. I think the ChildrenAsTriggers="false" won't stop the postbacks - it will just stop the content from updating.

For Sample 1, just query for single partition and merge results at the client end. This will be much faster. Datastax driver has token aware policy but it will only work when query refers to single partition.

You can refer this link.

For Sample 2, it is an anti pattern query and you cannot expect the client to do all the work for you. If you want to read complete table then you can use spark. Datastax provides spark-cassandra-connector which can provide somewhat same functionality which you have given. Here you can find description of spark-cassandra-connector.

1. It is the main method, so there is no need to cleanup. When main returns, the program exits. If this wasn't the main, then you would be correct.

2. There is no best practice that fits all use cases. The code you show here is a very common pattern. The function creates a goroutine, and returns a channel so that others can communicate with that goroutine. There is no rule that governs how channels must be created. There is no way to terminate that goroutine though. One use case this pattern fits well is reading a large resultset from a database. The channel allows streaming data as it is read from the database. In that case usually there are other means of terminating the goroutine though, like passing a context.

3. Again, there are no hard rules on how channels should be created/closed. A channel can be left open, and it will be garbage collected when it is no longer used. If the use case demands so, the channel can be left open indefinitely, and the scenario you worry about will never happen.

To pass in a map[interface{}]interface{}, it will need to be defined as such.

You can convert a map[string]string to a map[interface{}]interface{} using something like the following:

Your problem is that you have set SESSION_CONNECTION=session, but your SESSION_DRIVER=default, so you have to use SESSION_DRIVER=database in your .env. See the config/session.php:

Solution:

addContact(contact) accepts a single contact, so you would need to use for loop to add the contacts one by one.

You didn't describe omitting pg_replslot during your rsync, as the docs recommend. If you didn't omit it, then now your replica has a replication slot which is a clone of the one on the master. But if nothing ever connects to that slot on the replica and advances the cutoff, then the WAL never gets released to recycling. To fix you just need to shutdown the replica, remove that directory, restart it, (and wait for the next restart point to finish).

Do they need to go to wal_archive folder on the disk just like they go to wal_archive folder on the master node?

No, that is optional not necessary. It is set by archive_mode = always if you want it to happen.