tree 2b968b0a11eb5bf7a769cbae3819f2b0d6392546
parent ce199d7470c732e43cf2c6f8b102bc51a1a23c8c
author Antonio Barone <syntonyze@gmail.com> 1598961044 +0200
committer Antonio Barone <syntonyze@gmail.com> 1599064479 +0000

Remove replication events clustering

Replication events clustering is still a work in progress and it is
causing an elevated number of scheduled replication events which is
flooding this dual-master instance peers.

As an example, updating the user Settings' status on a gerrit instance
replicating to a filesystem target configured with a
distributionInterval of 1 causes a scheduling of 6 replication tasks,
as such:

```
[2020-09-02 18:27:09,615] scheduling replication
  All-Users:refs/users/00/1000000 =>
  file:///tmp/gerrit_setup/instance-2/git/All-Users.git
  [CONTEXT PLUGIN="replication" ]

[2020-09-02 18:27:09,616] scheduled
   All-Users:refs/users/00/1000000 => [fcbdeafa]
   push file:///tmp/gerrit_setup/instance-2/git/All-Users.git
   to run after 5s [CONTEXT PLUGIN="replication" ]
```

This in turn, causes the emission of 6 ref-replication-scheduled events:

```
{
   "project":"All-Users",
   "ref":"refs/users/00/1000000",
   "targetNode":"/tmp/gerrit_setup/instance-2/git/All-Users.git",
   "type":"ref-replication-scheduled",
   "eventCreatedOn":1599063267
}
```

Remove shared events and  volume so that only the active master is in
charge of replication. Turn off replication distributor, accordingly.

Bug: Issue 13346
Change-Id: Iee877729a72ee936a8a940abc90ed90879258829