Mario Kevo created GEODE-9718:
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Summary: The region is not created on all servers if commands are
run in parallel
Key: GEODE-9718
URL: https://issues.apache.org/jira/browse/GEODE-9718
Project: Geode
Issue Type: Bug
Reporter: Mario Kevo
We are using a system with a large number of servers.
While starting all servers, in parallel, we create a region through gfsh.
The problem is that on one of the servers region is not created.
It is started after the "create region" command is started, so it will not get
information to create a region on itself from the locator. Also, the cluster
configuration doesn't have that information yet, so the server cannot read it
from the received cluster configuration.
So, the problem is in changing cluster configuration whilst servers are coming
up.
The solutions are:
# Add to the documentation to not running commands that doing some changes on
cluster configuration while the server is in starting phase.
# Redesign all commands that can edit the cluster configuration to first wrote
changes to the cluster config and then distribute the commands to all servers.
The second solution can lead to some problems. When the "create region" command
is executed it got all servers from the view and sends all of them to start
creating a region with parameters specified in the command.
The region creating is started on all servers and after it is finished, it is
added to the cluster configuration. In case there are some problems with
creating a region(wrong parameter used or something else) it will not create a
region on the existing servers and will not write anything in a cluster
configuration.
In case we decide to change order, it will write in the cluster config before
the command is successful, and then we should have some backup to rollback
cluster configuration. Also, this will affects all commands that do changes in
cluster config.
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