[collectd] Does FLUSH block until it has completed?

[Andrew Beresford]

I've been doing some with the unixsock FLUSH command and it seems like
it doesn't FLUSH immediately. Reading the documentation, it suggests
that using FLUSH forces the RRD updates on to a queue to be written
immediately.

The problem I've noticed is that if I read the RRDs immediately after
a FLUSH, I still get old data. If I then do it again, it returns
up-to-date data.

Is this expected behaviour? This is on version 4.10.1.

Cheers,

Andrew