Re: Throttling App Logging

Daniel Jones

It's a similar situation, in that app teams are being re-educated to store
important data in persistent data stores, rather than logging.

AFAIK there is an element of best-effort with regards to the logging
requirements, in that reasonable efforts to persist the logs must be
demonstrable - so whilst it's acknowledged that logs aren't guaranteed, the
PaaS team has done all they can to make sure they stand as high a chance as
possible that they get to their destination. Just like having logs backed
up to tape doesn't guarantee their invincibility (the tapes might get
destroyed), but reasonable efforts have been made to keep them.

On Tue, Sep 22, 2015 at 10:17 AM, Aleksey Zalesov <
aleksey.zalesov(a)> wrote:

By the way how do you comply with the requirement to persist all the logs?
CF logging system is lossy by its nature so can drop messages.

We have similar requirement - *some* log messages must be reliably
delivered and stored. After some considerations we decided to use RabbitMQ
service for delivering these kind of messages from apps to log storage. All
other logs go through metron-doppler chain as usual.

Aleksey Zalesov | CloudFoundry Engineer | Altoros
Tel: (617) 841-2121 ext. 5707 | Toll free: 855-ALTOROS
Fax: (866) 201-3646 | Skype: aleksey_zalesov | |

On 22 Sep 2015, at 11:01, Daniel Jones <daniel.jones(a)>

Thanks all.

Sadly the client has a regulatory requirement for *some* apps that all
logs must be persisted for a number of years, so we can't drop messages
indiscriminately using the loggregator buffer. They're a PCF customer, so
I'll raise a feature request through the support process.


On Mon, Sep 21, 2015 at 5:24 PM, Rohit Kumar <rokumar(a)> wrote:

It isn't possible to throttle logging output on a per application basis.
It is possible to configure the message_drain_buffer_size [1] to be lower
than the default value of 100, which will reduce the number of logs which
loggregator will buffer. If the producer is filling up logs too quickly,
loggregator will drop the messages present in its buffer. This
configuration will affect ALL the applications running on your Cloud
Foundry environment. You could play with that property and see if it helps.



On Mon, Sep 21, 2015 at 2:57 AM, Daniel Jones <
daniel.jones(a)> wrote:

Is it possible with the current logging infrastructure in CF to limit
the logging throughput of particular apps or spaces?

Current client is running CF multi-tenant, and has some particularly
noisy customers. It'd be nice to be able to put a hard limit on how much
they can pass through to downstream commercial log indexers.

Any suggestions most gratefully received!


Daniel Jones


Daniel Jones


Daniel Jones

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