[ClusterLabs] Syncing data and reducing CPU utilization of cib process

[Nikhil Utane]

We are seeing this log in pacemaker.log continuously.

Mar 31 17:13:01 [6372] 0005B932ED72        cib:     info:
crm_compress_string:  Compressed 436756 bytes into 14635 (ratio 29:1) in
284ms

This looks to be the reason for high CPU. What does this log indicate?

-Regards
Nikhil


On Fri, Mar 31, 2017 at 12:08 PM, Nikhil Utane <nikhil.subscribed at gmail.com>
wrote:

> Hi,
>
> In our current design (which we plan to improve upon) we are using the CIB
> file to synchronize information across active and standby nodes.
> Basically we want the standby node to take the configuration that was used
> by the active node so we are adding those as resource attributes. This
> ensures that when the standby node takes over, it can read all the
> configuration which will be passed to it as environment variables.
> Initially we thought the list of configuration parameters will be less and
> we did some prototyping and saw that there wasn't much of an issue. But now
> the list has grown it has become close to 300 attributes. (I know this is
> like abusing the feature and we are looking towards doing it the right way).
>
> So I have two questions:
> 1) What is the best way to synchronize such kind of information across
> nodes in the cluster? DRBD? Anything else that is simpler? For e.g. instead
> of syncing 300 attributes i could just sync up the path to a file.
>
> 2) In the current design, is there anything that I can do to reduce the
> CPU utilization of cib process? Currently it regularly takes 30-50% of the
> CPU.
> Any quick fix that I can do which will bring it down? For e.g. configure
> how often it synchronizes etc?
>
> -Thanks
> Nikhil
>
>
>
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