On Tue, Jan 29, 2019 at 12:01 PM Han Zhou wrote:
>
> v1 -> v2:
> - Fixed a bug in json cache handling in patch 3/7.
> - Fixed XXXs.
> - Other minor improvements.
>
> ---
> In scalability test with ovn-scale-test, ovsdb-server SB load is not a
> problem at least with 1k HVs. However, if we restart the ovsdb-server,
> depending on the number of HVs and scale of logical objects, e.g. the
> number of logical ports, ovsdb-server of SB become an obvious bottleneck.
>
> In our test with 1k HVs and 20k logical ports (200 lport * 100 lswitches
> connected by one single logical router). Restarting ovsdb-server of SB
> resulted in 100% CPU of ovsdb-server for more than 1 hour. All HVs (and
> northd) are reconnecting and resyncing the big amount of data at the same
> time.
>
> Similar problem would happen in failover scenario. With active-active
> cluster, the problem can be aleviated slightly, because only 1/3 (assuming
> it is 3-node cluster) of the HVs will need to resync data from new servers,
> but it is still a serious problem.
>
> For detailed discussions for the problem and solutions, see:
> https://mail.openvswitch.org/pipermail/ovs-discuss/2018-October/047591.html
>
> The patches implements the proposal in that discussion. It introduces
> a new method monitor_cond_since to enable client to request changes that
> happened after a specific point so that the data has been cached already
> in client are not re-transfered.
>
> The current patches supports all 3 modes of ovsdb-server, but only clustered
> mode can benefit from it, since it is the only one that supports transaction
> id out of the box.
>
> Han Zhou (7):
> ovsdb-client.c: fix typo
> ovsdb_monitor: Fix style of prototypes.
> ovsdb-monitor: Refactor ovsdb monitor implementation.
> ovsdb-server: Transaction history tracking.
> ovsdb-monitor: Support monitor_cond_since.
> ovsdb-idl.c: Support monitor_cond_since method in C IDL.
> ovsdb-idl.c: Fast resync from server when connection reset.
>
> Documentation/ref/ovsdb-server.7.rst | 78 +-
> lib/ovsdb-idl.c | 229 +
> ovsdb/jsonrpc-server.c | 101 ++--
> ovsdb/monitor.c | 467
> +--
> ovsdb/monitor.h | 78 +++---
> ovsdb/ovsdb-client.c | 106 +++-
> ovsdb/ovsdb-server.c | 11 +
> ovsdb/ovsdb.c| 3 +
> ovsdb/ovsdb.h| 10 +
> ovsdb/transaction.c | 117 -
> ovsdb/transaction.h | 4 +
> tests/ovsdb-monitor.at | 294 ++
> 12 files changed, 1201 insertions(+), 297 deletions(-)
>
> --
> 2.1.0
>
Please review the formal patch instead:
https://patchwork.ozlabs.org/project/openvswitch/list/?series=92329
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