[OSM-dev] Transactions per minute?

[Lynn W. Deffenbaugh (Mr)]

The changesets are having the expected number of nodes for this time of 
day (based on my recorded history), but the transaction IDs are going up 
much faster (txnMax from state.txt).  For instance in the most recent 6 
hours the txnMax was 8129933, 8140852, 8152102, 8212660, 8302266, and 
8366981.  This is a delta for each 60 minute interval as follows:

4/19 00:01 delta 10,919
4/19 01:00 delta 11,250
4/19 02:01 delta 60,558
4/19 03:01 delta 89,606
4/19 04:00 delta 64,715

That's the jump that I'm seeing, not in the node, way, or relation 
counts, but in the delta of the txnMax values which I believe are 
transaction IDs from the database?

Lynn (D) - KJ4ERJ


On 4/19/2012 12:25 AM, Paul Norman wrote:
>> From: Lynn W. Deffenbaugh (Mr) [mailto:ldeffenb at homeside.to]
>> Sent: Wednesday, April 18, 2012 8:19 PM
>> To: dev at openstreetmap.org
>> Subject: [OSM-dev] Transactions per minute?
>>
>> Is something actually going on with the redaction diffs now?  Or is
>> something else driving up the transaction IDs?
>>
>> I track the change in transaction ID vs the minutely sequence and
>> instead of running between 100 and 500 transactions per minute, the past
>> two hours have been 1,000 and 1,500 transactions per sequence
>> respectively.  But strangely enough, the diffs applied in less than 10
>> minutes which is more like the time it takes my system to digest 200
>> transactions per minute.
> I don't believe they've started yet, and nothing looks unusual in my
> changeset watcher. There's been a half-dozen imports or so over the last
> day, but that's about normal.
>
>> I've been watching for a change in the update rate figuring that would
>> be an indication of the redaction activity because I've been wondering
>> if my marginally capable planet-wide map server would be able to digest
>> the burst of updates that are expected.  But if this is them, then I'm
>> out of the woods and can rest easily.
> Some back of the envelop calculations estimated that with the predicted
> schedule it would be at least 4-5 times normal traffic.
>
>