On 02/15/2011 10:31 AM, Kim van der Riet wrote:
On Tue, 2011-02-15 at 09:08 -0500, Alan Conway wrote:
I was asking if there is a way to know the used size of the journal
in a
given time. When I run my publisher for the first time, and in
qpid-stat
the queue size 2m in bytes, how can I know the effectively used
journal?
The calculation is quite complex and there tend to be lots of
variables (exact
timings of dequeues v. enqueues, relative messages sizes etc). in
practical
terms I have not found a way to accurately estimate the journal size
required
and so always greatly inflate it. It is an area I think we need to
make simpler
in some way.
Perhaps it would be useful to add some management instrumentation to
the
journals, so it is at least easy to see how much space is actually
used when you
run a test (or indeed in production so you can see if you're getting
close to
the limit)
This has been discussed. It is likely that a QMF function call would be
added which would calculate the amount of space left in the store when
it is called. However, to do this continually (it through
instrumentation) would likely be expensive and could slow the store down
significantly.
Doesn't that depend on how often you do it? E.g. could the user to configure an
alert every 10 minutes, or if the free space goes below 10% etc.?
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