[jira] [Created] (MESOS-7711) Master updates registry for reregistering agents even when they haven't been unreachable

["Yan Xu (JIRA)" <ji...@apache.org>]

Yan Xu created MESOS-7711:
-----------------------------

             Summary: Master updates registry for reregistering agents even when they haven't been unreachable
                 Key: MESOS-7711
                 URL: https://issues.apache.org/jira/browse/MESOS-7711
             Project: Mesos
          Issue Type: Bug
          Components: master
            Reporter: Yan Xu


During a master failover we observed many registry updates, on average _one per two agents_, as indicated by the log line 

{noformat:title=}
I0609 04:46:25.220196 48864 registrar.cpp:550] Successfully updated the registry in 42.904064ms
{noformat}

[code|https://github.com/apache/mesos/blob/19a6134d03141dc2cb073a904378c2c129b5138d/src/master/registrar.cpp#L550]

In this case few agents were ever unreachable so most of them are redundant. Associated with each registry update is also the time spent on applying the operations

{noformat:title=}
I0609 04:46:26.475761 48897 registrar.cpp:493] Applied 1 operations in 11.673082ms; attempting to update the registry
{noformat}
[code|https://github.com/apache/mesos/blob/19a6134d03141dc2cb073a904378c2c129b5138d/src/master/registrar.cpp#L493]

Even though on consuming the time on the Master actor, this could be easily avoided by checking with the {{slaves.recovered}} field in {{Master}}.



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