[Bug 1990978] Re: Raft bug: OVSDB leadership transfers every 10-20 min after initial compaction

[Alin-Gabriel Serdean]

Alternatively, the following script can be used to generate DB pressure:

#!/bin/bash
for i in {1..5000}
do
ovn-nbctl ls-add sw$i
if [[ $? -ne 0 ]] ; then
    echo "Failed on ls-add i: $i"
    exit 1
fi
        for j in {1..2000}
        do
                echo "Iteration i: $i and j:$j"
                ovn-nbctl lsp-add sw$i sw$i$j
                if [[ $? -ne 0 ]] ; then
                    echo "Failed on lsp-add i: $i and j: $j"
                    exit 1
                fi
        done
done
for i in {1..5000}
do
        echo "Delete iteration i: $i"
        ovn-nbctl ls-del sw$i
        if [[ $? -ne 0 ]] ; then
            echo "Failed on ls-del i: $i"
            exit 1
        fi
done

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https://bugs.launchpad.net/bugs/1990978

Title:
  Raft bug: OVSDB leadership transfers every 10-20 min after initial
  compaction

Status in openvswitch package in Ubuntu:
  New

Bug description:
  First compaction starts after 24 hours, or earlier after doubling of
  DB size.

  Subsequent compactions will trigger every 10-20 min.

  The OVS version hitting this issue:
  ovs-vsctl (Open vSwitch) 2.17.2

  Commit ID that fixes the issue is: https://github.com/openvswitch/ovs/commit/a32a4e1fa2d3fad284834d4b7bccc2e71d33f9da
  https://github.com/openvswitch/ovs/commit/dfc3e65c8191f5dc375337c23aed128b5c0d7781(2.17 branch patch)

  Testcase:
  Trigger compactions by using command line tool:
  ovs-appctl -t /var/run/ovn/ovnsb_db.ctl ovsdb-server/compact
  Check for leadership transfers using:
  sudo grep "Transferring leadership" /var/log/ovn/ov* | grep ovsdb-server-sb.log
  There should be a new entry every 10-20min.

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