[
https://issues.apache.org/jira/browse/RATIS-1930?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Tsz-wo Sze updated RATIS-1930:
------------------------------
Description:
RATIS-1912 added a restriction on setConf for enforcing a safety property,
otherwise, the server group may end up in a no-leader state and cannot recover
by themselves. The restriction is to disallow majority-add as defined below
- {*}Majority-add{*}: adding a majority of server in a single setConf. Note
that, when a single setConf removes and adds members at the same time, the
majority is counted after the removal.
This JIRA is to add a conf for enable/disable majority-add since, in some
monitored environment, the safety property is not a problem. The monitor (a
human or a program) could intervene to fix the problem, if it happens.
Disabling the restriction can improve performance. For example, change from
non-HA single server to a HA 3-server group can be done in a single setConf,
instead of 2 setConfs with the restriction.
was:
RATIS-1912 added a restriction on setConf for enforcing a safety property
(otherwise, the server group may end up in a no-leader state and cannot recover
by themselves). The restriction is to limit the number of servers being
added/replaced in a single setConf command.
This JIRA is to add a conf for enable/disable the setConf restriction since, in
some monitored environment, the safety property is not a problem. The monitor
(a human admin or a program) could intervene to fix the problem if it happens.
Disabling the restriction can improve performance. For example, change from
non-HA single server to a HA 3-server group can be done in a single setConf,
instead of 2 setConfs with the restriction.
Summary: Add a conf for enable/disable majority-add. (was: Add a conf
for enable/disable the setConf restriction)
> Add a conf for enable/disable majority-add.
> -------------------------------------------
>
> Key: RATIS-1930
> URL: https://issues.apache.org/jira/browse/RATIS-1930
> Project: Ratis
> Issue Type: Improvement
> Components: server
> Reporter: Tsz-wo Sze
> Assignee: Tsz-wo Sze
> Priority: Major
>
> RATIS-1912 added a restriction on setConf for enforcing a safety property,
> otherwise, the server group may end up in a no-leader state and cannot
> recover by themselves. The restriction is to disallow majority-add as defined
> below
> - {*}Majority-add{*}: adding a majority of server in a single setConf. Note
> that, when a single setConf removes and adds members at the same time, the
> majority is counted after the removal.
> This JIRA is to add a conf for enable/disable majority-add since, in some
> monitored environment, the safety property is not a problem. The monitor (a
> human or a program) could intervene to fix the problem, if it happens.
> Disabling the restriction can improve performance. For example, change from
> non-HA single server to a HA 3-server group can be done in a single setConf,
> instead of 2 setConfs with the restriction.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
