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Diffstat (limited to 'releasenotes/notes/increase-default-max-overflow-0af787268807f926.yaml')
| -rw-r--r-- | releasenotes/notes/increase-default-max-overflow-0af787268807f926.yaml | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/releasenotes/notes/increase-default-max-overflow-0af787268807f926.yaml b/releasenotes/notes/increase-default-max-overflow-0af787268807f926.yaml new file mode 100644 index 0000000..6547ac2 --- /dev/null +++ b/releasenotes/notes/increase-default-max-overflow-0af787268807f926.yaml @@ -0,0 +1,25 @@ +--- +upgrade: + - | + 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 |