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rpc.statd is single-threaded and runs its HA callout synchronously. If it is too slow then latency accumulates and rpc.statd's backlog grows. Running a pair of add-client/del-client events with the current code averages ~0.030s in my test environment. This mean that 1000 clients reclaiming locks after failover can easily cause 10s of latency. This could cause rpc.statd to become unresponsive, resulting in a time out for an rpcinfo-based health check of the status service. Split the add-client/del-client events out to a standalone statd_callout executable, written in C, to be used as the HA callout for rpc.statd. All other functions move to statd_callout_helper. Now, running a pair of add-client/del-client events in my test environment averages only ~0.002s. This seems less likely to cause latency problems. The standalone statd_callout executable needs to read a configuration file, which is generated by statd_callout_helper from the "startup" event. It also needs access to a list of currently assigned public IPs. For backward compatibility, during installation a symlink is created from $CTDB_BASE/statd-callout to the new statd_callout, which is installed in the helper directory. Testing this as part of the eventscript unit tests starts to become even more of a hack than it used to be. However, the dependency on stubs and the corresponding setup of fake state makes it hard to move this elsewhere. Signed-off-by: Martin Schwenke <mschwenke@ddn.com> Reviewed-by: Amitay Isaacs <amitay@gmail.com> Autobuild-User(master): Martin Schwenke <martins@samba.org> Autobuild-Date(master): Tue Jun 25 04:24:57 UTC 2024 on atb-devel-224 |
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| cluster | ||
| common | ||
| config | ||
| database | ||
| doc | ||
| event | ||
| failover | ||
| ib | ||
| include | ||
| protocol | ||
| server | ||
| tcp | ||
| tests | ||
| tools | ||
| utils | ||
| .bzrignore | ||
| .gitignore | ||
| configure | ||
| configure.rpm | ||
| COPYING | ||
| Makefile | ||
| README | ||
| wscript | ||
This is the release version of CTDB, a clustered implementation of TDB database used by Samba and other projects to store temporary data. This software is freely distributable under the GNU public license, a copy of which you should have received with this software (in a file called COPYING). For documentation on CTDB, please visit CTDB website http://ctdb.samba.org.