Hello.
On Sat 2002-12-07 at 10:14:57 -0800, [EMAIL PROTECTED] wrote:
> I have the binlog files stored to a separate drive (actually a partition on
> a drive other than the raid array for the tables). When this partition
> becomes full, mysql's load average goes from 1.5 to 25 and stays there until
> more space is available on the partition that holds the binlog.
>
> This isn't the biggest deal in the world, since I should make sure there is
> enough space, but why is this happening? It never happened with 3.23.x.
> Although it used to cause a segfault in 4.0.2. (MySQL 4.0.5 actually did
> segfault, but a while after it ran out of space and had 0 processes running.
> How it had 0 processes running is beyond me...)
Well, the following does not completely describe what you observe, but
might be a beginning: When MySQL encounters a disk-full condition, the
thread in question complains in the error log, simply sleeps and
checks in regular intervals if space has been freed.
Soon, there will be another thread which needs to access the same
tables/blocks/rows, that the first one did and still may lock, because
it did not finish yet. On you go, with one thread after another.
Of course, threads which process queries, which do not touch the stuff
blocked by the first thread or the binlog itself, will run fine. But
as you can imagine, the number of threads blocked will grow with time
and the number of threads to do other stuff will decrease until all
threads are blocked.
I am not sure why you observe this load (AFAIK, blocked threads should
not change the load), but it explains well, why 0 processes are
running. They are all waiting.
HTH,
Benjamin.
PS: Of course, that was only a general description. In real, details
may be more complex. For example, I could bet that writing on the
binlog is protected by a mutex. Therefore only the first thread
waits due to the disk full condition. Others which want to write
to binlog are waiting on the mutex instead. But anyhow, you get
the idea.
--
[EMAIL PROTECTED]
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