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Docs: Add failover changes to upgrading chapter

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Michael Friedrich 2019-04-01 09:31:55 +02:00
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doc/16-upgrading-icinga-2.md
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@ -28,6 +28,19 @@ This affects the following features:
* [OpenTsdb](09-object-types.md#objecttype-opentsdbwriter)
* [Perfdata](09-object-types.md#objecttype-perfdatawriter) (for PNP)
### HA Failover <a id="upgrading-to-2-11-ha-failover"></a>
The reconnect failover has been improved, and the default `failover_timeout`
for the DB IDO features has been lowered from 60 to 30 seconds.
Object authority updates (required for balancing in the cluster) happen
more frequenty (was 30, is 10 seconds).
Also the cold startup without object authority updates has been reduced
from 60 to 30 seconds. This is to allow cluster reconnects (lowered from 60s to 10s in 2.10)
before actually considering a failover/split brain scenario.
The [IdoMysqlConnection](09-object-types.md#objecttype-idomysqlconnection) and [IdoPgsqlConnection](09-object-types.md#objecttype-idopgsqlconnection)
objects provide a new attribute named `last_failover` which shows the last failover timestamp.
This value also is available in the [ido](10-icinga-template-library.md#itl-icinga-ido) CheckCommand output.
### Package Dependencies <a id="upgrading-to-2-11-package-dependencies"></a>