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---
upgrade:
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The default value of ``max_overflow`` config option
has been increased from 10 to 50 in order to allow
OpenStack services heavily using DBs to better handle
spikes of concurrent requests and lower the probability
of getting a pool timeout issue.
This change potentially leads to increasing of the number
of open connections to an RDBMS server. Depending on the
configuration, you may see "too many connections" errors
in logs of OpenStack services / RDBMS server. The max limit of
connections can be set by the means of these config options:
http://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_max_connections
http://www.postgresql.org/docs/current/static/runtime-config-connection.html#GUC-MAX-CONNECTIONS
For details, please see the following LP:
https://bugs.launchpad.net/oslo.db/+bug/1535375
and the ML thread:
http://lists.openstack.org/pipermail/openstack-dev/2015-December/082717.html
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