worryg0d commented on code in PR #1793:
URL:
https://github.com/apache/cassandra-gocql-driver/pull/1793#discussion_r1937157549
##########
session.go:
##########
@@ -1430,6 +1435,22 @@ func (q *Query) releaseAfterExecution() {
q.decRefCount()
}
+// SetHostID allows to define on which host the query should be executed.
+// If hostID is not set, then the HostSelectionPolicy will be used to pick a
host.
+// It is recommended to get host id from HostInfo.HostID(), but it is not
required.
+// It is strongly recommended to use WithContext() with this option because
+// if the specified host goes down during execution, the driver will try to
send the query to this host until it succeeds
+// which may lead to an endless execution.
+func (q *Query) SetHostID(hostID string) *Query {
+ q.hostID = hostID
Review Comment:
I spent some time thinking about this more and I'm +1 on what @jameshartig
says. We at least should have a way to restore `Query.hostID` to default.
If `SetHostID` takes `*string` it is available, but this makes UX of this
API way worse IMO. I don't like the idea of creating vars to hold some strings
and pass a pointer to them. However, if API is `SetHostID(string)` there is no
way to restore its behavior to default. Once `SetHostID()` is used, it can't be
changed. Ofc we can expose API `Query.Default()` to restore this behavior, but
this becomes something very odd to me.
All of this is based on the case when we want to copy the existing `Query`
and somehow modify it, but I'm unsure how this matches query immutability. By
this do we understand that once the `Query` obj is created it can't be
modified? Either it means that the driver doesn't modify `Query` internally
during its execution? As far as I know, gocql writes some metrics to the query
obj.
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